Crystal (mostly Temperature compensation) Patents

Basic (First) Crystal Patents

1450246 Piezo Electric Resonator 3 Apr 1923, 310/314 ; 310/318; 310/319; 331/163; 333/187; 601/2 - The first Quartz crystal patent.
1472583 Method of Maintaining Electrical Currents of Constant Frequency 30 Oct 1923 331/163 ; 330/112; 331/158; 331/159; 331/164
The above patents were licensed by General Radio and used in their Tuype 275 Piezo Electric Oscillator using a single 199 vacuum tube.
Practical quartz plates in the range of 100 kHz to 1.5 MHz.
1782117 Method of Mounting Piezo Electric Resonators for the Excitation of Various Overtones 310/321 ; 310/365; 310/366
1789496 Electrical System 20 Jan 1931 455/71 ; 331/158; 331/164 - G.W. Pierce describes crystal oscillators

General Radio by James Kilton Clapp

Clapp invented the Clapp oscillator which uses a capacitor in series with an inductor (or crystal) to allow adjusting the frequency (Wki).
1967184 Vibrator Apparatus, GR, July 17, 1934, 310/350 ; 219/210; 310/343; 310/354

This is a bar of quarts maybe 3/8" square and a couple of inches long suspended by two points at the center of the long face.
see: http://www.leapsecond.com/museum/gr676b-50kc/

1967185 Temperature Control Apparatus, July 17, 1934, 165/263 ; 165/291; 219/210; 236/1F; 236/1R

2012497 Electrical System, August 27, 1935, 331/158 ; 331/105; 331/164; 331/170; 331/175; 333/187
2029358 Electromechanical Vibrator, February 4, 1936, 310/354 - 100 kc Quartz bar

Roger L Easton (Wiki)

3560880 Crystal oscillator with automatic compensation for frequency drift due to aging, Roger L Easton, Charles A Bartholomew, Navy, 1968-12-23, 331/158; 331/175 -

Temperature Compensation Patents

4454483 Temperature compensation of an oscillator by fractional cycle synthesis June 12, 1984 Baylor
4453834 Electronic timepiece with temperature compensation June 12, 1984 Suzuki et al.
4443116 Electronic timepiece April 17, 1984 Yoshida et al.
4427952 Oscillator circuit with digital temperature compensation January 24, 1984 Zumsteg
4427302 Timekeeping signal source for an electronic timepiece January 24, 1984 Watanabe
5459436 Temperature compensated crystal oscillator with disable October 17, 1995 Pucci et al.
5473216 Piezoelectric device for controlling the frequency-temperature shift of
piezoelectric crystals and method of making same December 5, 1995 Brosig et al. 310/346; 310/344; 310/348; 310/361
5473216 Piezoelectric device for controlling the frequency-temperature shift of
piezoelectric crystals and method of making same December 5, 1995 Ishizaki et al. 310/346; 310/344; 310/348; 310/361
5525936 Temperature-compensated oscillator circuit June 11, 1996 Post et al. 331/47; 331/116FE; 331/158; 331/176
5548252 Digital temperature compensated crystal oscillator August 20, 1996 Watanabe et al. 331/176; 331/36C; 331/116FE; 331/158; 331/173; 331/177V
5572169 Temperature-compensated piezoelectric oscillator November 5, 1996 Iwamoto 331/176; 331/1R; 331/17; 331/158
5574408 Oscillator circuit having a memory that stores the characteristic
information of the individual oscillator crystal November 12, 1996 Zwack 331/176; 331/66; 331/158

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