Crystal (mostly Temperature compensation) Patents

© Brooke Clarke 2005 - 2007


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
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

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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