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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
7990226 Non-linear crystal oscillator capacitive load circuits Aug. 2, 2011
7986194 Oscillator Jul. 26, 2011
7975364 Method for producing a tuning-fork type crystal vibrating piece Jul. 12, 2011
7978016 Crystal oscillator Jul. 12, 2011
7973610 Surface mount crystal oscillator Jul. 5, 2011
7969071 Crystal unit for surface mounting having pillow members with two-layer structure Jun. 28, 2011
7965146 Constant-temperature type crystal oscillator Jun. 21, 2011
7961060 Amplitude regulated resonant oscillator with sampled feedback Jun. 14, 2011
7961055 PLL circuit and oscillator device Jun. 14, 2011
7952440 Crystal device for surface mounting May. 31, 2011
7944217 Object proximity detector and object position detector May. 17, 2011
7940138 Electrostatic discharge protection oscillation circuit in LSI May. 10, 2011
7940137 Systems and methods with reduced reference spurs using a crystal oscillator for broadband communications May. 10, 2011
7936227 Reference oscillator and its use May. 3, 2011
7932786 Surface mount type crystal oscillator Apr. 26, 2011
7928810 Oscillator arrangement and method for operating an oscillating crystal Apr. 19, 2011
7928811 System and method for use of a switched mode TCXO for receiver applications Apr. 19, 2011
7925463 Method and system for compensating temperature readings from a temperature sensing crystal integrated circuit Apr. 12, 2011
7924108 Oscillator amplifier with input clock detection and method therefor Apr. 12, 2011
7924106 Oscillation module Apr. 12, 2011
7920031 Crystal device for surface mounting Apr. 5, 2011
7915965 Oscillator having reduced sensitivity to acceleration Mar. 29, 2011
7911285 Reference frequency control circuit Mar. 22, 2011
7902933 Oscillator circuit Mar. 8, 2011
7899633 Sensing apparatus Mar. 1, 2011
7888984 Intermittent operation circuit and modulation device Feb. 15, 2011
7880553 Oscillation circuit with temperature compensation Feb. 1, 2011
7876168 Piezoelectric oscillator and method for manufacturing the same Jan. 25, 2011
7876167 Hybrid system having a non-MEMS device and a MEMS device Jan. 25, 2011
7872537 Surface-mount crystal oscillator Jan. 18, 2011
7872542 Variable capacitance with delay lock loop Jan. 18, 2011
7868710 Digitally-controlled crystal oscillator circuit Jan. 11, 2011
7868707 Surface-mount type crystal oscillator Jan. 11, 2011
7863993 Oscillator for providing oscillation signal with controllable frequency Jan. 4, 2011
7863989 Replica-bias automatic gain control Jan. 4, 2011
7859353 Oscillator and driving circuit and oscillation method thereof Dec. 28, 2010
7859351 Driver device, physical quantity measuring device, and electronic instrument Dec. 28, 2010
7859348 Crystal device for surface mounting Dec. 28, 2010
7855608 System and method for providing temperature correction in a crystal oscillator Dec. 21, 2010
7852167 Third overtone crystal oscillator Dec. 14, 2010
7845064 Method for manufacturing crystal device Dec. 7, 2010
7845063 Quartz crystal unit and method for manufacturing a quartz crystal unit and electronic apparatus Dec. 7, 2010
7839228 Low-noise high-stability crystal oscillator Nov. 23, 2010
7834710 Oscillator circuit and electronic device having oscillator circuit Nov. 16, 2010
7830215 Piezoelectric oscillator and method for manufacturing the same Nov. 9, 2010
7825742 Oscillator with a low power consumption Nov. 2, 2010
7821348 Crystal oscillator for surface mounting Oct. 26, 2010
7821347 Surface-mount crystal oscillator Oct. 26, 2010
7821346 Ovenized oscillator Oct. 26, 2010
7816993 Temperature compensated crystal oscillator Oct. 19, 2010

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