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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
8193869 Feedthrough capacitance compensation for resonant devices Jun. 5, 2012
8188802 System and method for efficiently generating an oscillating signal May. 29, 2012
8188800 Crystal oscillator with reduced acceleration sensitivity May. 29, 2012
8183947 Low power consuming quartz oscillator circuit with active polarisation May. 22, 2012
8174330 Method and system for an energy efficient temperature sensing crystal integrated circuit May. 8, 2012
8174331 Temperature compensated crystal oscillator, printed-circuit board, and electronic device May. 8, 2012
8154355 High-frequency colpitts circuit Apr. 10, 2012
8149068 Temperature controlled crystal oscillator Apr. 3, 2012
8143963 Voltage source circuit for crystal oscillation circuit Mar. 27, 2012
8143961 Technique for detecting crystals Mar. 27, 2012
8140039 Quadrature-input quadrature-output divider and phase locked loop frequency synthesizer or single side band mixer Mar. 20, 2012
8134814 Semiconductor device having an ESD protection circuit Mar. 13, 2012
8127426 Electronic apparatus having quartz crystal oscillating circuits Mar. 6, 2012
8130050 Dual table temperature compensated voltage controlled crystal oscillator system and method Mar. 6, 2012
8122587 Manufacturing method of quartz crystal unit Feb. 28, 2012
8125283 Method of manufacturing crystal element and crystal resonator manufactured thereby Feb. 28, 2012
8120439 Fast start-up crystal oscillator Feb. 21, 2012
8120438 Temperature compensated crystal oscillator Feb. 21, 2012
8120437 Oscillator with little deterioration capable of outputting clock pulses with target frequency Feb. 21, 2012
8115562 Oscillation circuit and method of controlling same Feb. 14, 2012
8111109 Temperature compensated piezoelectric oscillator Feb. 7, 2012
8102217 Oscillator having feedback path which is capable of supplying reduced voltage potential to oscillation circuit Jan. 24, 2012
8091189 Method for manufacturing quartz crystal unit, quartz crystal oscillator and electronic apparatus Jan. 10, 2012
8089325 Oven controlled multistage crystal oscillator Jan. 3, 2012
8085105 Constant-temperature type crystal oscillator Dec. 27, 2011
8076983 Constant-temperature type crystal oscillator Dec. 13, 2011
8072279 Crystal oscillator with pedestal Dec. 6, 2011
8072278 System and method for reducing power consumption of an oscillator Dec. 6, 2011
8072276 Surface mount crystal oscillator Dec. 6, 2011
8069549 Method for sealing a quartz crystal device Dec. 6, 2011
8067993 Constant current driven oscillating circuit Nov. 29, 2011
8067994 Surface mount type crystal oscillator Nov. 29, 2011
8058941 Voltage control type temperature compensation piezoelectric oscillator Nov. 15, 2011
8054138 Multi-oscillator circuit with variable power supply Nov. 8, 2011
8049572 Oven-controlled crystal oscillator Nov. 1, 2011
8044730 Secondary vibration damping type crystal oscillator circuit Oct. 25, 2011
8040197 Crystal oscillator Oct. 18, 2011
8040190 Phase-locked loop Oct. 18, 2011
8035283 Resonant actuator Oct. 11, 2011
8035454 Oscillator device comprising a thermally-controlled piezoelectric resonator Oct. 11, 2011
8031026 System and method for efficiently generating an oscillating signal Oct. 4, 2011
8031010 Ruggedized chip scale atomic clock Oct. 4, 2011
8031013 Surface-mount type crystal oscillator Oct. 4, 2011
8031023 Crystal oscillator for surface mounting Oct. 4, 2011
8031024 Temperature-corrected frequency control with crystal oscillators Oct. 4, 2011
8026460 Control circuit for thermostatic oven in oven controlled crystal oscillator Sep. 27, 2011
8026771 Driver device, physical quantity measuring device, and electronic instrument Sep. 27, 2011
8022777 Ovenized crystal oscillator assembly Sep. 20, 2011
8024145 Method and system for signal generation via a temperature sensing crystal integrated circuit Sep. 20, 2011
8013683 Constant-temperature type crystal oscillator Sep. 6, 2011

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










 
 
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