In this section when a title
is a link it goes to the USPTO web page describing the top
class. There you can see the hierarchy of the classes,
that are not so clear below.
When a class number is a link it takes you to a list of all
patents in that class. There are many more listed
there than here.
327 - Miscellaneous
Active
Electrical Nonlinear Devices, Circuits, and Systems 164
- Generating rectangular (e.g., clock, etc.) or pulse
waveform having random characteristic (e.g., random width,
etc.)
380 Cryptography 26
- Having mechanical control of signal encryption (e.g., cam)
119 pats 27
- By perforated record 77 pats 28
- Particular Algorithmic Function Encoding 636 pats 29
- NBS/DES algorithm 257 pats 30
- Public key 756 pats 33
- Using plural paths or channels 37
- Block/data stream enciphering 212 pats 38
- Frequency shift or inversion 121 pats many speech
scramblers here 39
- Having plural band pass filters 95 pats 40
- Having plural band pass filters 49 pats 41
- Having quantizing and subsequent normalizing of signal
(e.g., reentry telephone circuitry) 48 pats 42
- Data stream/substitution enciphering 157 pats 43
- Key sequence signal combined with data signal 255
pats 45
- Multiple key level 162 pats 46
- Nonlinear (e.g., pseudorandom) 487 pats 47
- Plural generators 155 pats 51
- Having production of printed copy (e.g., printer,
typewriter) 52
- Including particular structure or housing (e.g., display,
keyboard) 54
- By Modifying Optical Image (e.g., Transmissive Overlay)
322 pats 55
- Having Production of Printed Copy (e.g., Cryptographic
Printer or Typewriter) 161 pats 56
- Selectively Movable Element having Code Characters
47 pats 57
- Rotatable 54 pats 58
- Characters on peripheral surface (e.g., cylinder
section) 32 pats 252
- Electrical Signal Masking 135 pats 253
- By signal having discrete frequency component 50
pats 254
- By signal having discrete step amplitude variation
33 pats 255
- Communication System using Cryptography 169
pats 260
- Symmetric key synchronization 125 pats 262
- Transmitting a seed, sequence, or initial value 179
pats 265
- Combining outputs of shift register 76 pats 274
- Synchronization 100 pats 275
- Speech scrambler detail 97 pats
277
-
713 Electrical
Computers
and Digital Processing Systems: Support 150
- Multiple Computer Communication using Cryptography 166
pats 151
- Protection at a particular protocol layer 99 pats 169
- Mutual entity authentication 147 pats 171
- Having key exchange 215 pats 181
- Message digest travels with message 142 pats
1800
251292
Telephony, J. H. Rogers, 1881-12-20, - "My invention consists in
throwing a message sent from any transmitting-instrument through
two or more circuits alternately in rapid succession." 253061 Apparatus for Preparing and
Transmitting Secret Telegraphic Messages Jan 31 1832 A F & F B
Johnson 178/92; 83/202; 178/4; 178/17R;
178/37; 380/26
- intentions on paper tape rather than printed characters.
Precursor to punched paper tape. Little security since
a skilled person could read the code. 420262 Mixer 366/247;
210/251; 210/466; 220/568; 222/192; 380/54
- beverage mixer
449723
Device for Forming and Deciphering Secret Communications, Marshall
A. Wier, 1891-04-07, - “bi-letter code,' 1086823
Cryptographic Attachment for Type Writing Machine, E.H. Hebern
& F. Hoffman, Feb 10, 1914, 400/89; 400/473 - 1210656 Apparatus for Coding and
Decoding Jan 2, 1917 S M Kintner 380/26; 380/51;
400/77 - fixed substitution alphabet for teletype type machines 1233035
Apparatus for Producing a Series of Signs, A.G. Damm, Jul 10 1917,
380/58 - A-21 ? 1244477 Telegraphy Oct 30, 1917 P.B.
Delany 380/255; 178/98; 380/38 a public
sounder with inverted signals to prevent listening to message 1310719 Secret Signaling System, G.S.
Vernam, July 22, 1919, 380/33 ; 380/259; 380/26
Class 380/33 is for crypto systems
that transmit the message using a plurality of paths, yet that's
not how it works. This is just a One Time Pad.
1312572 Secret Signaling System Aug
12 1919 380/43; 380/260 R D Parker - Morse
code is broken up using a distributor
1320908 Ciphering and Decyphering
Mechanism Nov 4, 1919 380/27 R. D. Parker - paper tape
1356546 Cyphering System Oct 26, 1920380/47
L F Morehouse (AT&T)- Two 5 level paper tapes 1138832
Writing-machine, Ottomar
Fedor Bamberg, Edmund
Weinhold, App: 1913-05-29, Pub: 1915-05-11, oldest patent with
the main classification of 380/51 - single wheel simple
substitution 32 position rotor machine for encrypting. 1414496 Cryptographic Typewriter May 2
1922 P G G Beyer 380/51;
400/71; 400/184 - single rotor turns one step with each key press 1415106 Cyphering Device May 9 1922
380/27; 380/51; 380/267 L F Morehouse (AT&T) - improves on
1320908 by not encyphiring the control characters, makes for a
legible printout 1416765 Cyphering Device May 23 1922
380/27 G S Vernam (AT&T) - filed Jan 1920, paper tape 1426699 Cyphering Device Aug 22,
1922 380/27 R E Pierce (AT&T) - paper tape 1484477 Apparatus for Ciphering and
Deciphering Code Expressions, A.G. Damm, Feb 19 1924, 380/55
; 101/486; 101/85 1491358G
Enciphering Machine April 22, 1924 WE
380/27; 380/51; 400/73; 400/90 paper tape 1510441 Electric Coding Machine Sep 30,
1924 E. H. Hebern 380/51; 400/77
1516180 Secret Signaling System
Employing Apparatus for Automatically Encyphering and Decyphering
Messages Nov 18, 1924 380/27;
380/47 W. F. Friedman - paper tape 1520089
Electric Typewriting Machine, A. Scherbius (Wiki),
Dec 23 1924, 400/45 ; 101/94; 400/155; 400/163.2 - motor
powered typewriter 1522044 Secret Communication System
June 6, 1925 R. Brown - speech frequency inversion 380/38
1522775 Secret Signaling System
Employing Apparatus for Automatically Encyphering and Decyphering
Messages Jan 13, 1925 380/27; 380/47 W. F. Friedman - paper tape 1523689 Coding and Decoding Machine, S
Hole, Jan 20, 1925, 380/55 ; 235/201ME; 400/181; 400/77
Patent office markups probably because of a legal challenge.
This patent filed after Scherbius 1556964
1540107 Apparatus for the Production of
Cipher Documents especially for Telegraphic Dispatch AG Damm 380/52
; 400/474; 400/77 1542567 Secret Signaling June 16, 1925
R.C. Mathes voice frequency subbands & multiple channels 380/34;
380/38
1556964Electric
Ciphering Apparatus, A. Scherbius (Wiki),
App: 1922-04-20, Pub: Oct 13 1925, 380/51 - Start of
Enigma (Wiki)
Class 380: Cryptography
51: Electric Signal Modification\Having production of
printed copy
1584660Ciphering Device, A.
Scherbius, May 11 1926, 380/51 ; 400/158; 400/259; 400/261 -
cited by Link
2435502 Radio signaling means for aviation trainers - basis of
Enigma 1633625 Sycercy System June 28
1927 380/28 (AT&T) - telephone scrambler using controlled
distortion 1643546 Apparatus for Deciphering
Cipher Messages, A.G. Damm, Sep 27 1927 1644239 Apparatus for Producing a
Series of Signs Damm Oct 4, 1927 380/58 - A-21?
Enigma
1657411 Ciphering
Machine, A. Scherbius, Jan 24 1928, 380/52 ; 234/96;
380/261; 380/267; 380/51
1683072 Electric Code Machine E. H.
Hebern, Sep 4, 1928 380/52;
341/2; 380/58 (pre enigma) rotors, keyboard and lights - Friedman
showed this was not secure (Wiki)
The machine shown on Jerry's page
may be a prototype of this one?
1684028 Coding and Decoding Apparatus
and Code Changing Device Therefore, S Hole, Sep 11, 1928, 380/26
; 380/51; 400/182; 400/71 1724163400/365; 181/201;
400/90; 400/689; 400/690 quiet electric typewriter 1726578 - Secret Telephone System - Sep
23, 1929 Harry Nyquist - add a time delay proportional to frequency
to make unintelligible
1930
1744347 Coding Machine Kryha Jan 21,
1930 380/57 ; 380/58 1777425Electric cipher-writing machine, Bernstein
Paul, Chiffriermaschinen,
1930-10-07, - period of a single rotor much longer than 26 steps 1834278
Device for Insuring Privacy of Reception of Printing Telegraph,
Parker Hitt (International Communications Labs), Dec 1 1931, 178/37
; 178/42
Just conceals the printing on the
paper strip from the delivery boy by rolling it up.
1846105 Ciphering Apparatus Hagelin Feb
1932 380/55 - Model B-21 1848291
Ciphering and Deciphering Apparatus, Parker Hitt (International
Communication Labs), Mar 8 1932, 380/26 ; 370/298; 380/51 -
printing telegraph 1861857
Cryptographic Machine, E.H. Hebern (International Code Machine Co),
Jun 7 1932, 400/90 ; 400/217; 400/33; 400/364; 400/422;
400/615.2; 400/621; 400/621.1; 400/685; 400/691; 400/88
closer to Enigma
1952246
Arrangement for the Feeding of Gaseous Tubes, Hagelin, Mar 27 1934,
315/256 ; 315/228 - Lighting or crypto? - a shunt on a
transformer serves to limit lamp current
1938028Electrical
coding and de-coding device, Korn
Willi, Chiffriermaschinen,
1933-12-05, 380/26 - has the feel of the M-209?, bit
the title includes "electrical"
" The device according to the present invention, in
the event of an error at any point in the coding or
decoding, enables the device to be re turned immediately in
a simple manner to the condition and to that position of the
device at which the error must occur, so that it is only
necessary to take up the coding or decoding operation afresh
from there, without it being necessary to begin all over
again from the start."
1953918 Cryptographic System and
Apparatus April 10, 1934 J.I. Bellamy 380/42
instead of a digraphic cipher, 4 letters are automatically used 1956384 Pocket Cryptographic Apparatus,
April 24, 1934, A. Gentet 380/56
-aka the Sphinx strip cipher device. 1984599 Educational Device Safar Dec
1934 434/228 ; 315/313; 340/332 2013671 Electrical System and
Apparatus for Transmitting Intelligence Sep 10, 1935 2028508
Ciphering Apparatus, Parker Hitt (International Communication Labs),
Jan 21 1936, 380/55 ; 400/478- typewriter that automatically
spaces 5 letter groups 2028772 Cryptographic System Jan 28,
1936 Friedman 380/26 ; 380/51 - rotors 2042116
Mechanical Movement, R.K. Morris, May 1926, 74/143 ;
235/91R; 74/144; 74/151; 74/153 - Veeder
patented his counter in 1899 so that was a common technology 2056284 Signaling Means and Apparatus
Oct 6, 1936 LeRoy A. MacColl 380/252; 178/63R; 178/69B;
307/106; 380/46 paper tape 2089603 Ciphering Machine Hagelin Aug
1937 380/55 ; 380/58; 400/162; 400/83; 400/88 - model C-35 first in the C series
which resulted in the M-209 2098956 Signaling System Dudley, Nov
16, 1937 380/36 ; 379/414; 704/205 - multiple circuit split
frequency 2116683 Coding and Decoding Machine WS
Lemmon 380/55 ; 400/373; 400/474; 400/477 - 2116731 Coding and Decoding Machine AR
Noll 380/55 ; 400/474; 400/478; 400/479; 400/77 2125995 Ciphering Machine R.W. Doidge
Aug 9, 1938 380/26 2139676 Cryptographic Apparatus
Friedman Dec 1938 380/26 - Enigma like 2140424 Cryptographic Device Friedman
Dec 13 1938 380/57 - 29 tooth gear meshing
with 40 tooth gear 2151091 Signal Tansmission H.W. Dudley
March 21, 1939 (filed 1935) 380/39; 84/701; 84/DIG11;
324/76.12; 324/76.29; 379/414; 704/205; 704/206; 704/209 - a vocoder
used to compress speech to about 500 Hz bandwidth - a precursor to
SIGSALY 2183248 Wave Translation, RR Riesz, Dec
12, 1939 381/61 ; 333/28R; 380/39; 472/64; 704/205 - also
see 3012098
2206590 Portable Transmissin System,
Webb Jr., Jul 2, 1940 - simple speech inverter 2291978
Radio transmission system, Mouradian
Hughes, 1942-08-04, - adds channels on top of AM modulated
transmissions, either to get more channels or for secrecy 2327248
Wave-signal translating channel, Nelson P
Case, Hazeltine
Corp, App: 1942-05-08, W.W.II, Pub: 1943-08-17, - IFF? 2330049
Positive Detent, Hagelin, Sep 21 1943, 192/215 - random step
seize 2373890 Cipher Machine E. H. Hebern
April 17, 1945 380/51; 400/77; 400/473; 400/474 2394765
Ciphering and Deciphering Mechanism, Hagelin, Feb 12 1946, 380/26
2398694
Carrier-wave generating system, Nelson
P Case, Hazeltine
Corp, - generating correct frequency for given channel, IFF? 2401402 Secret Communication System
380/28 - June 4, 1946 (RCA) - voice by using a record (or
photographic image) as a key 2402059
Secrecy communication system, James F
Craib, Hazeltine
Research, App: 1942-04-29, W.W.II, Pub: 1946-06-11, - voice 2402182
Rotor, L. Rosen Jan 18, 1946 L. Rosen 380/26; 380/33;
380/58 - contact pressure is relieved during rotation to minimize
wear 2413440
Electronic switch, John
F Farrington, Hazeltine
Research, App: 1942-05-15, W.W.II, Pub: 1946-12-31, - IFF? 2413451
Ultra high frequency tuning unit, Johnson
John Kelly, Hazeltine
Research, App:1942-10-03, W.W.II, Pub: 1946-12-31, - IFF? 2426454
Electronic switch, Johnson
John Kelly, Hazeltine
Research, App: 1942-05-27, W.W.II, Pub: 1947-08-26, - IFF?
pulse train with variable widths 2437255
Graphic Privacy System March 9 1948 J V L Hogan 380/54;
355/42; 355/52; 380/37; 380/243; 380/245 2247170 Ciphering Machine Hagelin June
1941 380/55 ; 400/162; 400/89 - model BC-38 based on the C-38 2265715 Cipher Apparatus H. S. Bacon
Dec 9, 1941 380/27; 400/90 2406031Telegraph
ciphering key tape
machine, Parker
Ralzemond D, Bell
Telephone Labor Inc, Aug 20, 1946, 380/26, 380/44, 250/223.00R, 250/230, 234/96 - uses transparent and
opaque balls fed from hopper. punch 5-level tape 2402058
Secrecy communication system, Arthur
V Loughren, Hazeltine
Research Inc, App: 1941-06-25, TOP SECRET,
Pub: 1946-06-11, - better than inversion, cited
by 42 patents 2411206 Electrical Signalling Method,
Guanella, Nov 19, 1946 380/39 ; 380/38 - Original permuting sub
bands, but they can have different bandwidths
1950
1950 - 1953 Korean conflict (aka Police
Action) (Wiki)
2510338 Means of and Method for
Scrambling Speech Signals, Guanella, Jun 6, 1950 380/39 -
sub bands enhanced 2513307
Coding Means and Method, R.E. Gilman (IBM), Jul 4 1950, 380/26
- a group of plain text characters is converted into a group of
cipher text characters (block cipher) pre DES
Calls: 50946
Improvement in Signals, Albert J. Myer, Nov 14 1865, 380/57-
Cipher Disk 1510441 Electric Coding Machine Sep
30, 1924 E. H. Hebern 380/51; 400/77 1683072 Electric Code Machine E. H.
Hebern, Sep 4, 1928 380/52;
341/2; 380/58 (pre enigma rotor machine) 1953829
Apparatus for Cryptographically Transposing Characters, R.K.
Morris, Apr 3 1934, 380/55 ; 200/11A; 439/49; 74/142 2413592
Coding and Decoding Chart for Cryptography, Charles B. Strother,
Dec 1946, - sliding strips 2425518
Ciphering Apparatus, C.R. Doty (IBM), Aug 12 1947, 380/27
; 400/330.3; 400/373; 400/474; 400/477; 400/71
2518458
Authenticating Device, W.F. Friedman, Aug 15 1950, 380/59 -
10 Enigma type drums 2530579 Speech Inverter, L Koros, Nov
21, 1950 380/39 ; 332/153; 332/155 2547515
Secrecy System, W.J. Zenner (Teletype), Apr 3 1951, - uses Hebern
drums, but blocks reversals, i.e. if A->Y then Y does not go to
A.
Calls: 1310719 Secret Signaling System, G.S.
Vernam, July 22, 1919, 380/33 ; 380/259; 380/26 1522775 Secret Signaling System
Employing Apparatus for Automatically Encyphering and Decyphering
Messages Jan 13, 1925 380/27; 380/47 W. F. Friedman - paper tape 2405569
Cryptographic Telegraph System, K.E. Fitch (Bell), Aug 13 1946, 380/27
; 380/43- 5 level TTY 2406829
Telegraph System, H.H. Haglund (WU), Sep 3 1946, 380/43
2567812
Code transmitter, Clarence
N Hickman, Bell
Labs, App: 1948-03-26, Pub: 1951-09-11, - generates
touch-tones using a motor and magnetic fields/pick-up coils, 10
keys. 2629017 Speech Transmission System,
Dahlbom, Feb 17, 1953 370/503 ; 327/418; 380/39
- uses VOCODER 2709218 Method and Means for
Anti-Jamming in Radio, Gabrilovitch, May 24, 1955 455/45 ; 380/39;
455/1; 455/196.1; 455/48; 455/63.1 2765364 Keying Mechanism Hagelin Oct
1956 380/59 ; 380/55; 400/478; 400/89 - experimental model C-36 2802047Electric Switching Device for Ciphering
Apparatus, Hagelin, Aug 6 1957, 380/26 ; 380/51; 400/89 -
looks like KL-7
Talks about teleprinters and the
need to NOT encipher the <CR> and <LF> but do cipher
<Fig> and <Chr> also talks about "telegraph impulse
system (Wiki
Baudot) and multicircuit systems (one wire per character).
Calls: 1683072
Electric Code Machine E. H. Hebern, Sep 4, 1928 380/52;
341/2; 380/58 (pre enigma rotor machine) 2402182
Rotor, L Rosen, Jan 18, 1946 L. Rosen 380/26; 380/33;
380/58 - more reliable rotor construction
Called by: 2917579 Ciphering Machines, Hagelin,
Dec 15 1959, 380/26 ; 341/78; 341/81 3214518 APPARATUS FOR CODING AND
DECODING TELEPRINTER MESSAGES, Fritz
Butzke (Siemens & Halske), Oct 26 1965, -
Reads input tape in two positions
seperated by n characters and combines them into a single output
character. That output character is combined with a key
tape character to generate the final output.
3657699
Programmable cryptic device for enciphering and deciphering data,
Harold S. Richard et al (NCR), Jan 18
1977 - aimed at credit cards and ATMs 4275265Complete substitution
permutation enciphering and deciphering circuit, George I. Davida et al - allows for a 128 bit key
and certainty that all circuits are complete -
an upgraded DES type cipher
2851794Cryptographic Coding and Decoding Apparatus,
B. C. W. Hagelin Sep 15, 1968 380/57 - Crypto AG CD-55 first of the pocket
machines
2855514 Gaseous Discharge R.F. Noise
Source Oct , 1958 331/78; 313/633; 327/164; 327/601; 333/24R (up to
4.5 GHz) 2877565 Electrical Cryptograph,
Friedman (M-325
Wiki: SIGFOY)
380/52 - using a reflector made it weak. 2896071 Security Communication System,
July 21, 1959 380/39 ; 341/173; 380/260;
380/275 - synch signal embedded in message 2917579
Ciphering Machines, Hagelin, Dec 15 1959, 380/26 ; 341/78;
341/81 -
Calls: 1652708
Permutation Switch, Leeuw, Dec 13 1927, 439/189 ;
200/42.02; 439/488 1663624
Electric Apparatus, A.G. Damm, Mar 27 1028, 380/26
Calls: 1502376
Production of Ciphers, A.G. Damm, Jul 22 1924, 380/52 ;
400/474; 400/77 - 1540107
Apparatus for the Production of Cipher Documents Especially for
Telegraphic Dispatch, A.G. Damm, Jun 2 1925, 380/52 ;
400/474; 400/77
2934833
Enciphering Device, F. Burkhard, May 3 1960, 380/26 2941036
Electrical Signal Scrambling and Unscrambling Apparatus, W. Honolka,
3006081 Encoding Keying Device Nyberg
Oct 31, 1961 380/59 ; 380/57 3046545 Rapid Correlation Echo
Ranging System July 24, 1962 342/189; 342/195; 367/100;
370/521 - Pseudo Random Generator 3083263
Auxiliary Apparatus for Teletypers, Hagelin, Mar 26 1963, 380/2
; 380/33- CCIT 2 3124748 Secret Signaling Systems Mar
10, 1964, 380/32 ; 380/34; 380/39 mixing
voice bands with changing oscillator 3155818
Error-correcting systems, Frank
M Goetz, Bell
Labs, 1964-11-03, - 3163809 Random Noise system for
Vibration Testing Dec 29, 1964 318/132; 73/579; 327/164;
330/103; 330/126; 331/78 Photomultiplier generates noise and a lamp
is used in the feedback circuit 3171089 Diode Random Noise Generator
Feb 23, 1965 331/78; 327/164; 327/584
avalanche diode in reverse breakdown 3204035 - 370/208; 375/362 Orthonormal
Pulse Multiplex Transmissions Systems 26 Nov 1962 3328526 Speech Privacy System
Schroeder, Jun 27, 1967 380/39 ; 369/26.01;
455/39 - uses the sub band amplitudes to modulate the phase of that
freq. all the subbands are send at equal amplitude. see Dudley
vocoder 2151091 3349882 Ciphering Machine Florin et al
Oct 31, 1967 380/57 ; 400/162 - M209 like 3439279 - Synchronizing System for
Random Sequence Pulse Generators April 15, 1969 3485948
Perforated Tape Accessory Apparatus for a Ciphering Machine,
Hagelin, Dec 23 1969, 380/27 ; 341/95 3490044 Communications System, Roger L.
Easton, 1968-11-05, 380/34; 455/59 -
An improved secure communication system comprising: A
first and a second pseudorandom noise generator, said generators
having,respectively, a first and a second shift register, each
register having N stages and having logical circuit means for
randomly recirculating binary bits through the register for
generating a random repeatable pattern of binary bits, A reset
pulse source coupled to all stages of said first register to reset
said first register to a predetermined starting binary number, A
starting point switch matrix comprising N logical zero-one
switches connected, respectively, between the stages of said
second register and said reset pulse source, Means for feeding a
binary information number to said switches to reset said second
register to a starting point a predetermined number different from
the starting binary number of said first register, Transmitting
means for transmitting said pseudorandom noise generators outputs
connected to the outputs of said pseudorandom noise generators;
Receiving means for receiving said transmitting means
transmissions, said receiving means having an output; Recycling
storage means connected to the output of said receiving means for
storing the receiving means output signals; A third pseudorandom
noise generator identical in sequence to said first and second
pseudorandom noise generators having an output and a reset input,
said receiving means output connected to said reset input; A
correlator having a first input connected to said storage means
and a second input connected to said third pseudorandom noise
generator output for generating a signal upon correlation of said
storage means output and said third pseudorandom noise generator
output, and; Timing means connected to said correlator for timing
the interval between outputs thereof. Relates to SONAR.
3614400
Maximum length pulse sequence generators, Edward
Charles Farnett, Lee
Oliver Upton Jr, RCA,
1971-10-19, - 3618077 Walsh Function Generator
- Nov 2, 1971 3639690 Digital Privacy System - Feb 1,
1972 Motorola 3651404 Voice Privacy Adapter - March
21, 1972 frequency inversion - Motorola 380/39
; 332/168 3678204 - 177/15; 370/209 Signal
Processing and Transmission by means of Walsh Functions 26 Oct 1970
ITT 3701143 Walsh Function Generator
- 3723878 Voice Privacy Device, Miller,
Mar 27, 1973 380/39 ; 380/275; 380/44 -
additions to inverter 3742201 - 708/410 Transformer System
for Orthogonal Digital Waveforms June 26, 1973 3746799 Method and Apparatus for
Encoding and Decoding Analog Signals - 3749832 Binary Coded Signal and
Ciphering and Deciphering Method and Systems Embodying Same July 31
1973 380/28; 341/95; 380/37 3766316 Frame Synchronization Detector
- 3777064 Voice Privacy System, US Navy,
Dec 4, 1973 380/39 - uses active RC low pass
filters instead of LC or active LC filters. uses "Weaver
modulator" 3781472 Digital Data Ciphering
Technique, G.E. Goode (Datotek), Dec 25 1973, - electronic TTY
"The Business of Secrets: Adventures In Selling
Encryption Around The World" by Fred Kinch (Datotek), May 24, 2024
3781473 Random Digital Code Generator,
G.E. Goode (Datotek), Dec 25 1973, 380/46 - electronic TTY 3784983
Information handling system, J Eckert, H Welsh, J Weiner, R Shaw,
Sperry Corp, App: 1952-03-31 (22
Year Delay), Pub: 1974-01-08, 263 sheets of figures!
Tubes, 3795864 - Methods and Apparatus for
Generating Walsh Functions - 3798359 (Lucifer) Block Cipher
Cryptographic System 380/37 ; 380/28; 380/29; 380/46 3808536 Communications Scrambler System
380/45;
375/141; 380/46; 380/47- A scrambler system in which amplitude
zero-crossings in speech are encrypted at a transmitter by
combination with a pseudo-random digital sequence, the reverse
process occurring at the receiver. The amplitude envelope need not
be encrypted, but if desired, can be encrypted by combination with a
further pseudo-random digital sequence. A higher level of scrambling
can be achieved in the transmitted signal by using the conjugate of
the amplitude envelope. With a sequence bit rate of about two
kilobits per second, there is no increase in bandwidth requirements
compared to the transmission of unscrambled speech. Thus standard
transceivers can be employed, and pre-existing ones readily modified
for scrambling and unscrambling. 3859515 - 708/410; 324/76.12;
324/76.21; 340/5.81; 382/121 Method and Apparatus for Signal
Spectrum Analysis by Hadamard Transform Jan 7 1975 Burroughs 3868631
Digital cryptographic system and method, Barrie O Morgan, Kenneth M
Branscome, George E Goode, John Q Atchley, Datotek,
1975-02-25, - 3886313
Voice security method and system Datotek, May 27, 1975 380/40
; 341/181; 380/39 3893031 Synchronization System for
Voice Privacy Unit filed Nov 8, 1972 granted July 1, 1975 Henry L.
Majeau, Boeing
Company, 380/274;
340/146.2;
380/44;
380/262;
380/275
- uses 3 tones for synchronization like the KY-57
- A system for synchronizing the operation of two or more voice
privacy units. At least one otherwise "clear" tone is modulated by a
statistically random signal known as a Barker word, this tone then
being mixed with the audio signals and transmitted. The modulation
is present for a very short time, the conclusion of the modulation
initiating the operation of a code generator which scrambles the
succeeding audio signals. The recognition of the reception of the
modulated tone at the receiver initiates the operation of its code
generator (at the conclusion of the modulation), thereby recovering
the original plaintext speech. This is a form of speech
inversion 3909534 Voice privacy unit for
intercommunication systems - 3920894 Pseudo-Random Parallel Word
Generator 3934078 Key Generating System, D.K.
Gannett (Bell Labs), Jan 20 1976 (Filed May 1 1946) , 380/47
; 331/78; 380/41 - SIGSALY?
3936748 Secret communication system employing magnetic control
of signal, Hans A. Bomke (Army), Feb 3 1976 (filed: Sep 10 1956), 380/59
; 359/281; 398/183 - Faraday effect
Optical or microwave signal has
polarization plane rotated
3936749 Matched filter communication
systems, Ernst A. Guillemin (Army), Feb 3 1976 (filed: Jun 23 1961),
375/260 ; 375/240; 375/270; 375/343; 380/34; 380/40 - SSB
signal 3937888 Signal transmission with
secrecy, Oscar Myers (Bell Labs), Feb 10 1976 (filed Jun 17 1943), 380/22
; 380/35 - select one of 6 time delays for voice signal 3944744 Matrix Coding Secret
Signaling System, D.K. Gannett (Bell Labs), Mar 16 1976 (filed: May
10 1945), 380/41 - SIGSALY? 3944745 Secret signaling system
with means for preventing key Disclosure, Danforth
K. Gannett (Bell
Labs), Mar 16 1976 (filed: May 10 1945), 380/41 -
SIGSALY? 3962539
(DES) Product block cipher system for data security 380/29 ;
380/37; 713/150 3965296Signaling
System, R.L.
Miller (Bell
Labs), Jun 22 1976 (filed: Jun 30 1944), 380/41-
SIGSALY?
3965297 Secret communication signal generating system,
D.K. Gannett (Bell Labs), Jun 22 1976 (filed: May 1 1946, 380/41
; 331/78 - SIGSALY? 3967067 Secret telephony Filed: Sep
24, 1941 Pat Date June 29, 1976 380/41;
380/40;
704/205
Part of the SIGSALY
W.W. II Voice system 3968454 Signaling circuit, A.J. Busch
(Bell Labs), Jun 6 1976 (filed: Sep 27 1944), 331/78 ;
380/41; 380/47 - 17, 14, 13 stages TTY? 3976839 Telephone privacy system, R.L.
Miller stem for data security 380/29 ; 380/37; 713/150 3965296Signaling
System, R.L.
Miller (Bell
Labs), Aug 24 1976 (filed: Jun 30 1944), 380/41 ;
370/500 - SIGSALY? 3979558 Signaling system, E. Peterson
(Bell Labs), Sep 7 1976 (filed: Jun 30 1944), 380/41-
SIGSALY? 3983326 Key pulse generator for secrecy
signaling circuit, Sep 28 1976 (filed: Sep 27 1944), 380/41
; 331/78 - SIGSALY? 3983327 Electrical signaling, D.K.
Gannett (Bell Labs), Sep 28 1976 (filed: Jul 9 1945), 380/41
- SIGSALY? 3984922 Rotors, Leo Rosen, Oct 12 1976,
380/26 3985958 Secret telephony Filed: Dec
18, 1941 Pat: Oct 12, 1976 Part of the SIGSALY
W.W. II Voice system 3991271 Voice security method and
system, Datotek - analog 3991273 Speech component coded
multiplex carrier wave transmission Filed: October 4, 1943
Pat: Nov 9, 1976 Part of the SIGSALY
W.W. II Voice system 3995115 Speech privacy system Bell Labs
Nov 30, 1976 380/32 ; 380/275; 380/39;
704/205 Vocoder & removing fund freq 4013837 Voice security method and
system Datotek - analog 4020285 Voice security method and
system, Datotek - analog 4052565 - Walsh function signal
scrambler, D.D. Baxter (Martin Marietta), Oct 4 1977, 380/28
; 370/503; 375/142; 375/238; 375/242; 375/353; 375/367; 380/275;
380/31; 708/410 4079188 Multi-mode digital enciphering
system, Datotek, 4091423
Synchronous digital data scrambling system, Kenneth
M. Branscome, Datotek,
1978-05-23, - 4115657 Random digital code generator -
digital multiple registers with relativity prime lengths, Datotek 4126761 Method of and means for
processing an audio frequency signal to conceal intelligibility - 4133973 Digital cryptographic system
having synchronous and asynchronous capabilities, Datotek 4133974 System for locally enciphering
prime data - digital key generator using a register and addressable
memory, Datotek 4140873 Multi-mode digital enciphering
system 4145568 Method and apparatus for
ciphering and deciphering messages 380/47; 380/44; 380/260; 380/277
Pat: March 20, 1979 Filed: October 6, 1964 4145569 Method and apparatus for
synchronizing the ciphering and deciphering of binary-coded messages
380/262; 380/47 Pat: March 20, 1979 Filed: December 22, 1964 4149035 Method and apparatus for
enciphering and deciphering audio information - 4154006Coding and decoding machine Wood; Chester C,
May 15, 1979 380/57 ; 341/2 -
Searching for more patents related to
4154006 4143978
Electro-mechanical cipher machine, Bern
Anderson, Donald
W. Seiler, Navy,
1979-03-13, - 6175625Control
circuits for electric coding machines, Laurance F.
Safford, Donald W. Seiler, NSA, App: 1944-12-15, TOP SECRET 57 Years;
Pub: 2001-01-16, (see below)
4155659
Printing and coding machine, Edward S. Larson, Carl A. Levin, Rolf
A. Thienemann (Navy), May 22 1979 (filed: Feb 5 1940), 380/55
- SIGABA? 4156314 Rotors for a ciphering machine
380/26; 380/51; 439/43 Pat: May 29, 1979 Filed: February 21, 1944
Rosen; Leo 26 contacts
not KL-7 and not used in any U.S.
crypto machine 4157453 Cryptographic telegram
transmission system 380/36 Pat: June 5, 1979 Filed: October
10, 1944 Rosen; Leo 4157454 Method and system for machine
enciphering and deciphering June 5, 1979 380/37; 380/42;
380/45 (IBM) - 4166922 Multi-mode digital enciphering
system with repeated priming sequences, Datotek, 4168395 Start/stop teleprinter
scrambler 380/35; 380/43 4167700 Digital voice protection system
and method - 4169212 Multi-mode digital enciphering
system, Datotek 4170714 Digital cryptographic system
and testing thereof, Datotek
- digital data 4172968 Electrical system 380/43;
380/261; 380/275 digital voice encryption 4176316 Secure single sideband
communication system using modulated noise subcarrier 380/34, - RE34004
Priority: 1953-03-30, TOP SECRET, Pub: 1992-07-21, - cites
42 patents
4183088 Random number generator
708/250; 331/78 4184117 Communication security method
and system 380/34; 380/35; 455/46 4185166 Multi-mode digital enciphering
system - digital: off line, asynchronous or synchronous data,
Datotek 4185928 Printer for electric coding
machines 380/55 4188580 - Secure communication
system- 380/254; 375/145 4195202 Voice privacy system with
amplitude masking - 4200770 - (Public Key) Cryptographic
apparatus and method April 29, 1980 380/30; 380/44; 380/285;
713/169; 713/171 4217469 - Coding and decoding apparatus
for the protection of communication secrecy 380/27; 380/36 time
delay 4218582
(Trapdoor flawed)Public key cryptographic apparatus and method 380/30
; 713/168; 713/170 4229817 Portable electronic
cryptographic device, Datotek - alpha numeric digital keypad &
display 4232194 Voice encryption system, Adams,
Nov 4, 1980 380/28 ; 380/257; 380/275; 380/39;
704/205 - using DSP methods to provide more sub bands 4244053 Privacy communication method
and system - 4245346
Communication system, Robert
J. Grady, Harry
G. Posthumus, Magnavox
Electronic Systems Co, Filed: 1962-02-07, (Classified) Pub: 1981-01-13, 380/31; 342/378 -
Direct Sequence Spread Spectrum. 4268720 Scrambler speech transmission
and synchronization system - 4276652 Secure communication system
with improved frequency-hopping arrangement - variable BFO 4278840 Dynamic frequency and time
voice encryption system and method, Datotek - analog 4309569
(tree authentication) Method of providing digital signatures 713/177
; 340/5.8; 713/180; 902/2; 902/5 4316055 - Stream/block cipher
cryptographic system February 16, 1982 380/37; 380/43;
380/45 4341925 - Random digital encryption
secure communication system - combine two PR code streams 4349695 Recipient and message
authentication method and system, Datotek - two way pass & CRC
at end 4351982 RSA Public-key data encryption
system having large random prime number generating microprocessor or
the like September 28, 1982380/30; 380/282; 380/285
(Racal-Miglo Datacryptor64) 4358857
Communication system, Joseph
P. Gleason, Harry
G. Posthumus, Magnavox,
App: 1958-05-09, TOP SECRET,
Pub: 1982-11-09, - 4386233
Cryptographic key notarization methods and apparatus 380/281
; 380/280; 380/45; 713/155; 713/180; 902/2; 902/5 4392021 Secure facsimile transmission
system using time-delay modulation - FAX 4405829 (RSA) Cryptographic
communications system and method Sep 20, 1983 380/30;
380/255; 713/150; 713/151 (Racal-Miglo Datacryptor64) 4424414
Exponentiation cryptographic apparatus and method 380/30 ;
380/285; 380/44; 713/171 4433211 Privacy communication system
employing time/frequency transformation 4434322 Coded data transmission system
Feb 28, 1984 380/43; 380/44; 380/265 (Racal-Miglo
Datacryptor64) 4567600
Method and apparatus for maintaining the privacy of digital messages
conveyed by public transmission 713/174 ; 380/278; 380/285;
380/33 4625076
(ESIGN signatures) Signed document transmission system 713/176
; 380/30; 713/180 4633036 (Prime 3 Gen)Method and
apparatus for use in public-key data encryption system 380/30
; 380/277; 902/2 4748668 Method, apparatus and article
for identification and signature 380/30 ; 380/28 4754482 Method and apparatus for
synchronizing encrypting and decrypting systems June 28, 1988 713/181;
380/262; 714/798 4850017 Controlled use of cryptographic
keys via generating station established control values 380/280
; 380/281; 380/45; 380/47 4850018
Security system with enhanced protection against compromising 4850019 Data randomization equipment 380/29
; 380/33; 380/37; 380/46 4856063 No-overhead synchronization for
cryptographic systems August 8, 1989 380/262- Datotek
1990
4881264 Digital signature system and
method based on a conventional encryption function 713/177 ;
380/28; 713/180 4893339 Secure communication system
January 9, 1990 4908861 Data authentication using
modification detection codes based on a public one way encryption
function 713/187 ; 340/5.8; 380/29; 380/30; 726/2 4956862 Method of providing sound privacy
system compatible with mono and btsc stereo audio 4956863
Cryptographic method and apparatus for public key exchange with
authentication 380/30 ; 380/285; 380/44; 380/47; 713/169;
713/171 4995082 Method for identifying
subscribers and for generating and verifying electronic signatures
in a data exchange system 713/169 ; 380/30; 380/46; 705/67;
713/180 5003597 Method and apparatus for data
encryption 380/37 ; 380/28; 380/29 5003598 Secure communication system 5003599 In-band framing method and
apparatus 5016274 On-line/off-line digital
signing 705/66 ; 235/379; 235/380; 340/5.4; 380/29; 380/30;
713/180 5140634 Method and apparatus for
authenticating accreditations and for authenticating and signing
messages 713/180 ; 235/382; 380/30; 705/67; 713/172 5146498 Remote key manipulations for
over-the-air re-keying - based on modifying the current stored key
to make the new one 5214703 Device for the conversion of a
digital block and use of same 380/37 ; 380/28; 380/42 5222136 Encrypted communication system
380/266; 380/29; 380/43; 380/284 5231668 Digital signature algorithm 380/28
; 380/30 5237611 Encryption/decryption
apparatus with non-accessible table of keys 380/284;
380/30; 380/44; 380/45; 380/243; 713/181; 713/194 5276737 Fair cryptosystems and methods
of use 380/30 ; 380/286 5278907Analog scrambling with
continuous synchronization - Audio
Samples - 5299262 Method for exponentiating in
cryptographic systems 380/28 ; 380/30; 713/168; 713/174;
713/180 5301247 Method for ensuring secure
communications 380/43; 380/46; 380/47; 380/277; 380/284 5305384 Apparatus, system and method
for transmitting secure signals over narrow spaced channels -300 Hz
to 3200 Hz spaced 11.4 kHz 5311176 Method and apparatus for
generating Walsh codes - 5363376 Method and apparatus for
synchronizing timing among radio ports in wireless communications
systems 5428686 - Secure communication system
having long-term keying variable - NSA patent about mixing a
key held in the scrambler with a key sent over the air.
5455861 Secure telecommunications - using encryption only over
part of the comm path 5528693 Method and apparatus for voice
encryption in a communications system 5787180 Method of connecting a
scrambler or encryption device to a hand-held portable cellular
telephone - mike and speaker connections 5822430 System for encoding
encryption/decryption information into IFF challenges Oct 13, 1998 380/260;
342/45; 380/274; 380/277 5852803 Apparatus, System and Method
for Recording and/or Retrieving Audio Information Dec 22, 1998 704/270;
704/272 (talking label)
6175625Control
circuits for electric coding machines, Laurance F. Safford, Donald
W. Seiler, NSA, App: 1944-12-15, TOP
SECRET 57 Years; Pub: 2001-01-16, 380/26; 341/50; 341/90; 341/91; 380/287;
380/52; 380/56; 380/57; 380/59 - SIGABA (jproc: ECM2)
Calls: 1540107 Apparatus for the Production
of Cipher Documents especially for Telegraphic Dispatch AG Damm 380/52
; 400/474; 400/77 2116683 Coding and Decoding Machine
WS Lemmon 380/55 ; 400/373; 400/474; 400/477 - 2116731 Coding and Decoding Machine
AR Noll 380/55 ; 400/474; 400/478; 400/479; 400/77
7088826
Method for providing a crypto key and check word to an encryption
device, Christian L Houlberg, Gary S. Borgen (Navy), Aug 8,
2006, 380/277; 380/278; 380/279;
380/280; 713/193 - for use in missile, mentions KOI-18 &
KYK-13
calls: H1414 Nonvolatile memory system for
storing a key word and sensing the presence of an External Loader
Device and Encryption Circuit, Gary S. Borgen (Navy),
Feb 12 1991, 380/4; 380/9; 380/21;
380/49; 380/50; 395/425 - for use in missile
mentions: 4392241
Digital Interface System, Dennis P. Hurst (Navy), Jul 5, 1983,
455/26; 455/27 - Red - Black com system
calls: 3262116 SATELLITE AND SPACE
COMMUNICATIONS SYSTEMS Jul 1966 3879582 Data Loop Communication
System, Apr 1975 3964056 System for transferring
data between central units and controlled units Jun 15, 1976 3970994 Communication switching
system Jul 20, 1976 3993997 Communication system and
method Nov 23, 1976 4034346 Interface for
establishing communications between a data-processing unit and
a plurality of stations, Jul 5, 1977 4047162 Interface circuit for
communicating between two data highways Sep 6, 1977 4140972 System for synchronizing
synthesizers of communication systems, Feb 20, 1979 4184117 Communication security
method and system, Jan 15, 1980 4320514 Spread spectrum FH-MFSK
radio receiver, Mar 16, 1982
4563546
Method for preventing "compromising radiation", Ekkehard Glitz
(Licentia Patent-Verwaltungs-GmbH),
Jan 7, 1986, 178/220.1;
178/220.9;
178/221.9;
179/15M
- generates data that is the inverse of the actual data so
that they balance each other.
calls: 3077518 Apparatus for
Camouflaging Communication Signals, Gustav GUANELLA
(Patelhold Switzerland) Feb 12 1963 - pulse manipulation
keying 3133991 Method and Apparatus for
Masking Communication Signals, GUANELLA May 1964 - voice
signal is sampled and mixed with another signal resulting in a
noise like encrypted signal. 3634665 SYSTEM USE OF
SELF-TESTING CHECKING CIRCUITS Jan 1972 4176247 Signal
scrambler-unscrambler for binary coded transmission system Nov
27, 1979 4177355 Array device for data
scrambling Dec 4, 1979 4225962 Mosaic printer Sep 30,
1980 4283602 Cryptographically secure
communication system Aug 11, 1981 4404426 Cryptographic telegraphy
programming system Sep 13, 1983 4447672 Device for encrypting
each input data bit by at least one keying bit decided by a
code pattern and a bit pattern of a predetermined number of
preceding encrypted bits, May 8, 1984
Model KGV-68 encryption circuit manufactured by Motorola
enciphering device described in U.S. Pat. No. 4563546 calls: 4097923 Remote postage meter
charging system using an advanced microcomputerized postage
meter Jun 27, 1978 4247908 Re-linked portable data
terminal controller system Jan 27, 1981 4376299 Data center for remote
postage meter recharging system having physically secure
encrypting apparatus and employing encrypted seed number
signals, Mar 8, 1983 4392241 Digital interface system,
Jul 5, 1983 4424573 System for entering a
postage meter serial number into a nonvolatile memory from an
external channel after assembly of the meter Jan 3, 1984 4470127 Data terminal with error
checking file transfer mode, Sep 4, 1984 4563546 Method for preventing
"compromising radiation" Jan 7, 1986 4654860 Spacecraft telemetry
regenerator, Mar 31, 1987 4800590 Computer key and computer
lock system, Jan 24, 1989 5046006 Mutual missile control
system, Sep 3, 1991
4465901 Crypto microprocessor that
executes enciphered programs Aug 14, 1984 - 178/220.8; 178/220.9;
200/610.8; 364/200
A microprocessor for executing
computer programs which are stored in cipher to prevent software
piracy.
5458041 Air defense destruction
missile weapon system Oct 17, 1995 5481610 Digital radio transceiver
with encrypted key storage Jan 2, 1996 Ericsson Inc. 5513261 Key management scheme for use
with electronic cards Apr 30, 1996 5654698 Missile telemetry data
interface circuit Aug 5, 1997 - PCM data stream -> TTL mixed
with sync
PIC 16F84
H1414 Nonvolatile memory
system for storing a key word and sensing the presence of
an External Loader Device and Encryption Circuit, Gary S.
Borgen (Navy),
Feb 12 1991, 380/4; 380/9; 380/21; 380/49; 380/50; 395/425
- for use in missile 6859537 Non-volatile memory
for use with an encryption device Feb 22, 2005 - mentions
KOI-18
same as 6968061
6968061 Method which uses a
non-volatile memory to store a crypto key and a check word
for an encryption device Nov 22, 2005
A method using a
Non-Volatile Memory circuit which operates as an
interface between a key loader and an encryption device
in a missile's telemetry system. The method includes a
step for storing a crypto key and an associated check
word and a backup crypto key and check word in the
EEPROM of a microcontroller, and a step for indicating
the status of a load of the crypto key in the
microcontroller as well as a step for indicating the
status of an erase of the crypto key from the
microcontroller. The method also includes a step for
turning off the missile's transmitter when a key load
occurs to prevents transmission of the crypto key and
its corresponding check word. The method further
includes a step for erasing the crypto key and its
associated check word from an EEPROM within the
microcontroller upon a missile launch.
mentiones KOI-18
Might be a description of the PPS-SM used in early GPS
receivers like the Trimpack
and PLGR
7088826Method for providing a crypto key and
checkword to an encryption device
same as 6968061
called by: 7321910 Microprocessor apparatus and
method for performing block cipher cryptographic functions Jan 22,
2008
7212638
Wireless cryptographic fill system and method, Michael Thomas
Kurdziel, John Michael Trinidad (Harris), May 1, 2007, 380/273;
380/270
Prior Art includes the AN/CYZ-10 (Crypto Machines web page).
calls: 4281216 Key management for
encryption/decryption systems Jul 28, 1981 Motorola FIPSP46 60+
patent pages of software flow diagrams. 5960085 Security badge for automated
access control and secure data gathering Sep 28, 1999 (not the
same but similar RFID lock)
Enigma Related German (DE)
Patents
Ralph Simpson purchased a package of German patents related to
enigma. I used that as a starting point to search for more
Crypto patents. The numbering matches Ralph's.
1. DE5650A -
no pdf, no figures, but there is English text
2. DE14877
Ernst George, Espacenet
- "
3. DE61472Espacenet
- "
4. DE68167 - "
5. DE89897 - "
6. DE107347 -
" US641481
Cipher apparatus, Giovanni Battista Nob Valvasori, 1900-01-16
7. DE184674 -
" AT33211
Cryptographic apparatus, 1908-06-10 FR380052A/en
Device for encrypted correspondence, 1907-11-28 GB190716588A
Apparatus for Correspondence in Clipher, Carl Haas, Heinrich
Studt, 1907-12-19, US875070
Apparatus for correspondence in cipher, Carl Haas, Heinrich Studt,
1907-12-31, 380/58 - with pdf
version - M94 https://prc68.com/I/M94.shtml#Patents CA109529A/en
Apparatus for writing in cipher, Carl Haas, Heinrich Studt,
1907-12-31 - no pdf, no figures, no text CH40479A/en
Apparatus for correspondence in cipher, Carl Haas, Heinrich Studt,
1908-07-16 - no pdf, no figures, no text
8. DE214964C/en
- no pdf, no figures, but there is English text
9. DE365840C/en hGB187312
Improvements in or relating to cyphering machines, 1922-10-16 - no
pdf, no figures, but there is English text CH96888A/en
Encryption device, Henkels Albert, 1922-11-16 - no pdf, no
figures, but there is English text US1515680
Coding and decoding machine, Henkels Albert, 1924-11-18, 380/57 -
with pdf version https://prc68.com/I/Cryptopat.shtml#1515680
10. DE383003C/en
- no pdf, no figures, but there is English text GB154962
Improvement in code machines, 1920-12-06, - no pdf, no figures,
but there is English text - Powers holds many patents related to
census taking CA203729A/en
Code machine, 1920-09-07 - no pdf, no figures, but there is
English text ES79281A1/en
A procedure, with its corresponding apparatus, for automatic
cryptography, 1921-12-01 - no pdf, no figures,no text
11. DE393297C/en
- no pdf, no figures, but there is English text FR492681A/en
- no pdf, no figures,no text GB125032 -
no pdf, no figures, but there is English text hIT1154761B/en DK31138C/en
- no pdf, no figures,no text CH97076A/en
- no pdf, no figures, but there is English text
12. DE400795C/en
- no pdf, no figures, but there is English text DE416219C/en
Encryption machine, Securitas, 1925-07-08, hUS1533252
Coding and decoding machine, Koch Hugo Alexander, Securitas,
1925-04-14, 380/51; 400/176 -
13. DE407804C/en
- no pdf, no figures, but there is
English text DE429122C/en
Cipher machine with a plurality of cipher rollers which cause the
characters to be interchanged -no pdf, no
figures, but there is English text US1777425
Electric cipher-writing machine, Bernstein Paul,
Chiffriermaschinen, 1930-10-07, - improved rotor machine
14. DE409301C/en
- no pdf, no figures, but there is English text - see
12. for more Securitas patents
15. DE412582C/en
- no pdf, no figures, but there is English text, for more Chiffriermaschinen see 13.
16. DE414547C/en
- FR684136A/en
- Telegraph apparatus for secret telegraphy, Richard Michel,
Richard Dreyse, 1930-06-21 - no pdf, no text
17. DE416833C/en
- no pdf, no figures, but there is
English text
18. hDE425147C/en
- no pdf, no
figures, but there is English text
19. DE429242C/en
- no pdf, no figures, but there is
English text
20. DE452194C/en
- Electric device for encryption and decryption, Willi Korn,
Chiffriermaschinen, 1928-11-14 9
more crypto patents, one US 1938028
Electrical coding and de-coding device, Korn Willi,
Chiffriermaschinen, 1933-12-05, 380/26 - has
the feel of the M-209?
12. DE400795C/en- no pdf, no figures, but there is
English text
13. DE407804C/en,
Electric key cipher, Paul
Bernstein, Chiffriermaschinen, 1925-08-22, - no pdf, no figures, but there is
English text
1777425 Electric
cipher-writing machine (see above)
14. DE409301C/en
- no pdf, no
figures, but there is English text
15. DE412582C/en
- no pdf, no figures, but there is
English text
16. DE414547C/en
- no pdf, no
figures, but there is English text
17. hDE416833C/en- no pdf, no figures, but there is
English text 18. DE425147C/en
- no pdf, no figures, but there is
English text
19. DE429242C/en
- no pdf, no figures, but there is
English text
20. hDE452194C/en
- Electric device for encryption and decryption, Willie
Korn, Chiffriermaschinen, 1928-11-14, See: 1938028
21. DE454392C/en- no pdf,
no figures, but there is English text 22. DE519925C/en
Encryption device, 1931-03-05 - no pdf, no figures, but there is
English text 23. DE534947C/en
Electric encryption and decryption device, Willie Korn,
Chiffriermaschinen, 1931-10-06 - - no pdf, no
figures, but there is English text 24. DE577075C/en
Encryption device, Erich Kuhles, 1933-05-23, - no pdf, no figures, but
there is English text 25. DE586199C/en
Device for encryption and decryption, 1933-10-17, - no pdf, no figures, but
there is English text
26. DE607638C/en
Encryption device, Willie
Korn, Chiffriermaschinen,
1935-01-04, no pdf, no figures, but
there is English text
27. DE618826C/en
Device for encrypting and decrypting messages, August
Cremer, 1935-09-16, no
figures, but there is English text
28. DE629972C/en
Encryption machine, Dr
Ernst Braeier, 1936-05-16,
29. DE667562C/en
Encryption machine with adjusting device
to be operated by adjusting members,
1938-11-14, -
General Patents 2480872
Beam tube receiver input, James R Moore, Sec
of War, App: 1942-11-28, TOP SECRET, Pub:
1949-09-06, - T/R switching 2498561
Adjustable band-pass selector, Harry
J Lipkin, Sec
of War, App: 1945-09-06, TOP SECRET, Pub:
1950-02-21, - wide IF BW for accurate pulse timing, narrow
IF BW for sensitivity 2597352
Decoding device, Jr
Edward F Macnichol, Sec
of War, App: 1944-10-10, TOP SECRET, Pub: 1952-05-20, -
depends on the time between a start pulse and a data pulse. 12.5
uS mentioned a number of times. 2606282
Pulse transponder, Harry
J Lipkin, Sec
of War, App: 1945-07-09, TOP SECRET, Pub: 1952-08-05,
- "...generally known as beacons. When
used for navigation and as . transponders when used for
identification pur poses." 2567851
Pulse-blocking circuit, Harry
J Lipkin, Sec
of War, App: 1945-08-01, TOP SECRET, Pub: 1951-09-11,
- tube multivibrtor (flip-flop), 2679043
Beacon receiver, Harry
J Lipkin, Grambsch
Russel, Sec of
War, App: 1946-05-21, TOP SECRET, Pub: 1954-05-18, -
concerned with AGC & responding only to the main RADAR lobe. 2679580
Wide band receiver-transmitter, Ware
Harold, Sec
of War, App: 1945-01-24, Pub: 1954-05-25, - acorn tube,
Interrogator Responder Transmitter/ Interrogator Responder
Receiver.
Hazeltine 2188970
Electric timing system, John
C Wilson, Hazeltine
Corp, 1940-02-06, - using lumped delay lines for working
with TV pulses. involves pulse to pulse timing. 2327248
Wave-signal translating channel, Nelson
P Case, Hazeltine
Corp, App: 1942-05-08, W.W.II, Pub: 1943-08-17, - IFF? 2398694
Carrier-wave generating system, Nelson
P Case, Hazeltine
Corp, - generating correct frequency for given channel, IFF? 2403889
Telemetering system, Toro
Michael J Di, Hazeltine
Research, App:, TOP SECRET, Pub: 1943-08-24, - maybe to
encode the altimeter onto an IFF type system? 2413440
Electronic switch, John
F Farrington, Hazeltine
Research, App: 1942-05-15, W.W.II, Pub: 1946-12-31, - IFF? 2413451
Ultra high frequency tuning unit, Johnson
John Kelly, Hazeltine
Research, App:1942-10-03, W.W.II, Pub: 1946-12-31, - TV or
IFF?
2413607 Time-delay network, Toro
Michael J Di, Hazeltine
Research, 1946-12-31, - TV or IFF? 2415359
Wave-signal translating system, Bernard
D Loughlin, Hazeltine
Research, Priority: 1943-12-31, TOP SECRET, Pub: 1947-02-04,
- "This invention relates, in general, to wave-signal translating
systems and is particularly directed to coding or secrecy aspects
of transponder systems. As used throughout this specification and
in the appended claims, the term “transponder system' is intended
to describe a wave signal translating system which includes a
receiving system and a transmitting system so arranged that a
predetermined answer or reply signal is transmitted in response to
a received interrogating signal, the reply and interrogating
signals preferably comprising radiant-energy wave signals." 2421136
Gain control system for pulse modulation receivers, Harold
A Wheeler, Hazeltine
Research, App: 1945-06-01, W.W.II, Pub: 1947-05-27, -
"...for use in a radio-locating and direction-finding system of
the type utilizing pulse-modulated signals ..." "For example, the
coded signal may include a pair of pulse components, individually
having a rectangular wave form and fixed duration but a time
separation that is variable in a code sequence. " 2426454
Electronic switch, Johnson
John Kelly, Hazeltine
Research, App: 1942-05-27, W.W.II, Pub: 1947-08-26, - IFF?
pulse train with variable widths 2426454
Electronic switch, Johnson
John Kelly, Hazeltine
Research, App: 1942-05-27, W.W.II, Pub: 1947-08-26, - IFF?
pulse train with variable widths 2454865
Time-delay network, Toro
Michael J Di, Hazeltine
Research, App: 1945-06-18, W.W.II, Pub: 1948-11-30, - 2457212
Time-delay network, Toro
Michael J Di, Hazeltine
Research, App: 1945-06-18, W.W.II, Pub: 1948-12-28, - 2483097
Position indicator for airborne traffic, Mcilwain
Knox, Hazeltine
Research, App: 1946-09-12, W.W.II, Pub: 1949-09-27, -
bearing and altitude of aircraft 2522706
Multiple-reflecting time-delay system, Toro
Michael J Di, Hazeltine
Research, 1950-09-19, - television 2570805
Signal-translating system, Hazeltine
Alan, Hazeltine
Research, App: 1946-07-20, W.W.II, Pub: 1951-10-09. - 2589808
Transpondor system, Charles
J Hirsch, Hazeltine
Research, App: 1946-10-21, W.W.II, Pub: 1952-03-18, - 2
ground stations give position and direction of aircraft. -
Hirsch worked for T.A. Edison up until 1930, patent 1996378
Hum elimination (in AM radio) in his name 1931, then started at
Hazeltine Research by 1944. 2462265
Frequency divider, App: 1944-08-16, W.W.II, Pub: 1949-02-22, -
related to A-scope RADAR display 2572725
Path-indicating system for Mobile Craft, App: 1946-02-15, W.W.II,
Pub: 1951-10-23, - for blind landing 2652194
Electrical Computer, 1953-09-15, - tubes, makes use of the
frequency divider, not clear what it's for 2686910
Wave-signal transmitting system, 1954-08-17, - VOR (Wiki) 2640925
Electron discharge signal-sampling device, 1953-06-02, - DME (Wiki) 2754481
Electrostrictive time-delay signal translating device, 1956-07-10,
- prior art barium titanate 2827564
Time-delay signal-repeater system, 1958-03-18, - MTI (Wiki)
2996707 Radar control system, 1961-08-15, - DME (Wiki) 2795656
Repeater system, 1957-06-11, - for bipolar signals down to DC, but
what application? 3002090
Automatic-gain-control system, 1961-09-26, - 3015689
Color-television camera, 1962-01-02, - 3235806
Signal translating circuit, 1966-02-15, - based on Tunnel Diodes
work done at and for RCA, not Hazeltine. 3387299
Lightweight iff detection system, John
H Gutman, Huebscher
Herbert, Hazeltine
Research, 1968-06-04, - for use on the ground with SAM (Wiki).
Patents after the APX-6
2515178
Means for synchronizing detection and interrogation systems, Barchok
Donald, Army,
App: 1943-10-12, W.W.II, Pub: 1950-07-18, - 2796602
Aircraft identification and location system, Gerard C Hess, Norman
H Taylor, Raymond M Wilmotte, PADEVCO Inc, App: 1947-08-08, Pub:
1957-06-18, - 32
patent citations. 3004253
IFF System, Teck
A Wilson, Hughes
Aircraft, 1961-10-10, - 3750163
IFF System, K
Hecker, Navy,
1973-07-31, - 5892478Adaptive azimuth processing
for monopulse IFF interrogators, Leonard A. Moss, Hazeltine
Corp,
QST Sep 1960: Communication on 1215 Mc. with the APX-6, printed
page 30. - converting for use in ham band for AM voice.
QST Feb 1961: Practical Operating HInts for 1215 Mc. printed
page 27. -
