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Class Information
Number: 331/158
Name: Oscillators > Electromechanical resonator > Crystal
Description: Subject matter wherein the frequency determining electrically driven material body is a crystal exhibiting the piezoelectric effect. Examples of such crystals are quartz, Rochelle salt, tourmaline or other crystal classes which do not possess a center of symmetry and wherein deformation of the crystal is proportional to the first power of the imposed electric field, the direction of deformation referring upon reversal of the field.










Sub-classes under this class:

Class Number Class Name Patents
331/164 Anode or cathode to grid crystal circuit 0
331/163 Crystal having three or more electrodes in circuit 23
331/162 Plural crystals in circuit 46
331/159 Plural tube 19
331/161 With crystal substitution 18
331/160 With means to limit crystal current or voltage 72


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Patent Number Title Of Patent Date Issued
4376918 Overtone crystal oscillating circuit Mar. 15, 1983
4376919 Circuitry for switching effective electrode area on a crystal in a crystal oscillator to vary the oscillation frequency Mar. 15, 1983
4358839 Absolute digital clock system Nov. 9, 1982
4358742 Transimpedance oscillator having high gain amplifier Nov. 9, 1982
4350961 Electronic timepiece Sep. 21, 1982
4346537 Capacitor trimming system in a quartz-crystal oscillator Aug. 31, 1982
4345221 Temperature compensated signal generator including two crystal oscillators Aug. 17, 1982
4344046 Signal generator including high and low frequency oscillators Aug. 10, 1982
4337529 Pace timing device Jun. 29, 1982
4322694 Crystal oscillator implemented with CMOS technology Mar. 30, 1982
4321562 Crystal oscillator circuit capable of changing the number of inverter stages coupled in series Mar. 23, 1982
4318063 Crystal oscillator compensated for g-sensitivity Mar. 2, 1982
4283691 Crystal oscillator having low noise signal extraction circuit Aug. 11, 1981
4282496 Starting circuit for low power oscillator circuit Aug. 4, 1981
4274066 Quartz crystal oscillator Jun. 16, 1981
4227158 Multifrequency control from a single crystal Oct. 7, 1980
4224580 Quartz crystal oscillator Sep. 23, 1980
4223524 Quartz oscillation circuit for electronic timepieces Sep. 23, 1980
4208741 AFC System for a synthesizer tuning system Jun. 17, 1980
4199734 Crystal oscillator having switchably disabled harmonic-tuned output circuit Apr. 22, 1980
4190808 Amplifier-oscillator frequency multiplier apparatus Feb. 26, 1980
4179671 Capacitor switching circuits for adjusting crystal oscillator frequency Dec. 18, 1979
4166984 Restricted rate of change phase lock loop apparatus Sep. 4, 1979
4160183 Oscillator having a quartz resonator cut to compensate for static and dynamic thermal transients Jul. 3, 1979
4152675 Crystal oscillator with adjustable duty cycle May. 1, 1979
4136289 Phase control circuit and oscillator circuit using it Jan. 23, 1979
4104599 Crystal oscillating circuit Aug. 1, 1978
4100512 Crystal oscillator compensated against frequency shift due to acceleration Jul. 11, 1978
4096451 High signal-to-noise ratio negative resistance crystal oscillator Jun. 20, 1978
4095195 Low power dissipation crystal oscillator Jun. 13, 1978
4085364 Circuit for setting transmission and reception frequencies Apr. 18, 1978
4079280 Quartz resonator cut to compensate for static and dynamic thermal transients Mar. 14, 1978
4072912 Network for temperature compensation of an AT cut quartz crystal oscillator Feb. 7, 1978
4068462 Frequency adjustment circuit Jan. 17, 1978
4056761 Sonic transducer and drive circuit Nov. 1, 1977
4051446 Temperature compensating circuit for use with a crystal oscillator Sep. 27, 1977
4039973 Initiation circuit in a crystal-controlled oscillator Aug. 2, 1977
4039972 Crystal controlled logic gate clock pulse generator Aug. 2, 1977
4020627 Liquid crystal display electronic watch May. 3, 1977
4020426 Temperature compensation circuit for crystal oscillator Apr. 26, 1977
4007582 Method and apparatus for synchronizing an electrodynamic clockwork drive Feb. 15, 1977
3999368 Circuit for an electronic timepiece Dec. 28, 1976
3993962 Low noise parametric varactor diode crystal oscillator Nov. 23, 1976
3978650 Electric timepiece Sep. 7, 1976

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20










 
 
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