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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
4743865 Quartz-crystal microwave oscillator of the common-emitter transmission type with two transistors and a predetermined loaded Q factor May. 10, 1988
4736192 Excitation circuit for piezo-electric sound generators Apr. 5, 1988
4734659 Ultrasonic oscillator Mar. 29, 1988
4727752 Pseudosinusoidal oscillator drive system Mar. 1, 1988
4710731 Planar type thickness shear mode quartz oscillator Dec. 1, 1987
4709218 Overtone crystal oscillator Nov. 24, 1987
4704587 Crystal oscillator circuit for fast reliable start-up Nov. 3, 1987
4661785 Balanced feedback oscillators Apr. 28, 1987
4646033 Crystal controlled oscillator Feb. 24, 1987
4646034 Very high frequency quartz oscillator Feb. 24, 1987
4628285 3-terminal oscillating element and oscillator employing the same Dec. 9, 1986
4613829 Switchable oscillator circuit Sep. 23, 1986
4609885 Device providing compensation for acceleration sensitivity of an oscillator Sep. 2, 1986
4607237 Temperature-compensated crystal oscillator circuit Aug. 19, 1986
4607239 Adjustment of the frequency-temperature characteristics of crystal oscillators Aug. 19, 1986
4602224 Variable capacitance reactance circuit Jul. 22, 1986
4600899 Dual mode crystal phase shift transistor oscillator Jul. 15, 1986
4591808 High efficiency oscillator output stage and method of operation May. 27, 1986
4591807 Low power, low voltage oscillator May. 27, 1986
4587499 Temperature compensating circuit for oscillator May. 6, 1986
4587497 Low-power low-harmonic transistor oscillator May. 6, 1986
4586006 Crystal oscillator assembly Apr. 29, 1986
4583059 Adjustable frequency crystal oscillator with temperature compensation Apr. 15, 1986
4575690 Acceleration insensitive oscillator Mar. 11, 1986
4574255 MMC Substrate including capacitors having perovskite structure dielectric and electrical devices including MMC substrate Mar. 4, 1986
4571558 Voltage controlled crystal oscillator with reduced oscillations at crystal overtones Feb. 18, 1986
4560956 Oscillator with crystal-resistive feedback Dec. 24, 1985
4550293 Narrow deviation voltage controlled crystal oscillator Oct. 29, 1985
4540956 High frequency band-pass amplifier with adjustable impedance and oscillator including it Sep. 10, 1985
4539532 Method of minimizing the aging rate of an oscillator Sep. 3, 1985
4536721 Low noise crystal oscillator Aug. 20, 1985
4527131 Oscillating circuit exhibiting tolerance to crystal impedance variations Jul. 2, 1985
4524295 Apparatus and method for generating mechanical waves Jun. 18, 1985
4517533 Integrated crystal VCO May. 14, 1985
4513255 Phase locked crystal oscillator implemented with digital logic elements Apr. 23, 1985
4504720 High frequency generator for welding apparatus Mar. 12, 1985
4485818 Multi-mode microprocessor-based programmable cardiac pacer Dec. 4, 1984
4484157 Voltage controlled crystal oscillator having wide frequency range Nov. 20, 1984
4481488 Trapped energy resonator for oscillator and multiple resonator applications Nov. 6, 1984
4479098 Circuit for tracking and maintaining drive of actuator/mass at resonance Oct. 23, 1984
4468634 Crystal oscillator producing two frequencies by means of amplitude modulation and demodulation Aug. 28, 1984
4464599 Piezoelectric resonator with integrated capacitances Aug. 7, 1984
4453141 Suppression of vibration effects on piezoelectric crystal resonators Jun. 5, 1984
4450377 Integrated circuit with piezoelectric resonator mounted on blocks comprising capacitors May. 22, 1984
4449122 Proximity detector employing a crystal oscillator May. 15, 1984
4443116 Electronic timepiece Apr. 17, 1984
4427307 Rotary drill bit Jan. 24, 1984
4420652 Hermetically sealed package Dec. 13, 1983
4415870 Oscillator circuit with digital temperature compensation Nov. 15, 1983
4378532 Oscillator mode suppression apparatus having bandpass effect Mar. 29, 1983

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