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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
6930559 Oscillation state discrimination circuit and oscillation control circuit adapted to oscillation circuit Aug. 16, 2005
6927641 Oscillator and electronic device using the same Aug. 9, 2005
6927640 Apparatus and method for reducing phase noise in oscillator circuits Aug. 9, 2005
6911873 Detection circuit and method for an oscillator Jun. 28, 2005
6909883 Wireless communication device Jun. 21, 2005
6903616 Startup circuit and method for starting an oscillator after power-off Jun. 7, 2005
6903618 Quartz crystal unit, and quartz crystal oscillator having quartz crystal unit Jun. 7, 2005
6894577 Apparatus for providing power control to a real-time clock oscillator May. 17, 2005
6888418 Control circuit and method for a crystal oscillator using a timer May. 3, 2005
6882232 Surface-mount crystal oscillator Apr. 19, 2005
6876264 Surface-mount crystal oscillator Apr. 5, 2005
6870430 PLL-controlled oscillator Mar. 22, 2005
6870434 Method for compensating temperature in crystal oscillator Mar. 22, 2005
6861917 Oscillator system with switched-capacitor network and method for generating a precision time reference Mar. 1, 2005
6861915 Crystal oscillator with adjustable capacitive assembly having selectable capacitances Mar. 1, 2005
6859110 High-stability piezoelectric oscillator Feb. 22, 2005
6847265 Temperature-compensated crystal oscillator Jan. 25, 2005
6836190 Oscillator device and electronic apparatus using the same Dec. 28, 2004
6833768 Surface-mount crystal oscillator Dec. 21, 2004
6831525 Oscillator arrangements with improved frequency stability Dec. 14, 2004
6828868 Semiconductor device having an oscillating circuit Dec. 7, 2004
6819191 Piezoelectric oscillator unit Nov. 16, 2004
6819194 Tunable voltage-controlled temperature-compensated crystal oscillator Nov. 16, 2004
6819195 Stimulated quick start oscillator Nov. 16, 2004
6819196 Crystal oscillator with control feedback to maintain oscillation Nov. 16, 2004
6812801 Crystal oscillator circuit having capacitors for governing the resonant circuit Nov. 2, 2004
6809604 Voltage control oscillator having a ferroelectric thin film perovskite single crystal resonator Oct. 26, 2004
6798307 Sheet substrate for crystal oscillator and method of manufacturing surface-mount crystal oscillators using same Sep. 28, 2004
6798304 Apparatus and method for reducing phase noise in oscillator circuits Sep. 28, 2004
6798301 Method and apparatus for controlling oscillation amplitude and oscillation frequency of crystal oscillator Sep. 28, 2004
6798306 High-frequency oscillation circuit and measuring device Sep. 28, 2004
6794948 Oscillation circuit and electronics using the same Sep. 21, 2004
6791421 Input-switching voltage-controlled oscillator and PLL-controlled oscillator Sep. 14, 2004
6791428 Duty cycle tuner for low power real time clock oscillator Sep. 14, 2004
6791424 Piezoelectric oscillator Sep. 14, 2004
6788159 Temperature compensated oscillator, adjusting method thereof, and integrated circuit for temperature compensated oscillator Sep. 7, 2004
6784757 High quality parallel resonance oscillator Aug. 31, 2004
6784756 On-board processor compensated oven controlled crystal oscillator Aug. 31, 2004
6781472 Pseudo-cubic function generator circuit Aug. 24, 2004
6778032 Voltage controlled oscillator and phase-locked oscillator using the same Aug. 17, 2004
6774735 Low power self-biasing oscillator circuit Aug. 10, 2004
6771135 Temperature-compensated crystal oscillator Aug. 3, 2004
6771136 System and method for restoring the mark and space ratio of a clocking signal output from an oscillator Aug. 3, 2004
6768388 Voltage-controlled piezoelectric oscillator Jul. 27, 2004
6768389 Integrated, digitally-controlled crystal oscillator Jul. 27, 2004
6762651 High frequency crystal oscillator and high frequency signal generating method Jul. 13, 2004
6759914 Oscillator circuit Jul. 6, 2004
6759913 Crystal resonator based oscillator formed by attaching two separate housings Jul. 6, 2004
6756863 High-frequency oscillator of frequency switching type and high-frequency oscillation method Jun. 29, 2004
6741137 High quality serial resonance oscillator May. 25, 2004

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










 
 
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