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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
6559730 Electronic switch with static control voltage for dynamically switching capacitance in a frequency-adjustable crystal oscillator May. 6, 2003
6559728 Miniature ovenized crystal oscillator May. 6, 2003
6556091 Low noise oscillator having dissimilar MOS gate structures Apr. 29, 2003
6556092 Low consumption oscillator Apr. 29, 2003
6556094 Oscillator circuit and integrated circuit for oscillation Apr. 29, 2003
6549083 High-frequency crystal oscillator outputting a harmonic component Apr. 15, 2003
6545556 Oscillating element that can be piezoelectrically excited Apr. 8, 2003
6542042 Low power crystal oscillator with feedback resistor pair Apr. 1, 2003
6525619 Crystal-oscillator circuit for preventing stopping of oscillation Feb. 25, 2003
6522212 Matched crystal temperature compensation device Feb. 18, 2003
6509804 Low frequency quartz oscillator device with improved thermal characteristics Jan. 21, 2003
6507248 Voltage-controlled crystal oscillator Jan. 14, 2003
6501340 Oscillator with frequency stabilizing circuit and method of constructing same Dec. 31, 2002
6486743 Device for driving and detecting oscillator Nov. 26, 2002
6480071 Piezoelectric oscillator and electronic device Nov. 12, 2002
6480073 Method of evaluating quality of crystal unit Nov. 12, 2002
6476682 Method for calibrating a temperature sensitive oscillator Nov. 5, 2002
6459342 System and method for controlling an oscillator Oct. 1, 2002
6456168 Temperature compensated crystal oscillator assembled on crystal base Sep. 24, 2002
6452460 Surface mounting quartz-crystal oscillator Sep. 17, 2002
6445258 Oscillator circuit with signal buffering and start-up circuitry Sep. 3, 2002
6445254 Crystal oscillator and method of bonding IC chip useful for fabricating crystal oscillator Sep. 3, 2002
6441671 Digital trim capacitor programming Aug. 27, 2002
6437652 Apparatus and method for reducing phase noise in oscillator circuits Aug. 20, 2002
6420938 Software controlled crystal oscillator Jul. 16, 2002
6414559 Single package temperature compensated electronic device Jul. 2, 2002
6411172 Oscillator circuit with reduced capacity for AC coupling capacitor Jun. 25, 2002
6411169 Oscillation circuit, electronic circuit using the same, and semiconductor device, electronic equipment, and timepiece using the same Jun. 25, 2002
6400231 Numerically controlled variable oscillator Jun. 4, 2002
6388534 Laser controlled crystal and dielectric resonator oscillators May. 14, 2002
6388532 System and method for programming oscillators May. 14, 2002
6380816 Oscillator and voltage controlled oscillator Apr. 30, 2002
6377130 Temperature stabilized CMOS oscillator circuit Apr. 23, 2002
6366175 Temperature compensated oscillator, method of controlling temperature compensated oscillator, and wireless communication device Apr. 2, 2002
6362699 Temperature compensating circuit for a crystal oscillator Mar. 26, 2002
6362700 Temperature controlled compensated oscillator Mar. 26, 2002
6346862 Quartz oscillation circuit and quartz oscillation integrated circuit device Feb. 12, 2002
6340920 Low voltage low power crystal oscillator Jan. 22, 2002
6337600 Oscillator and oscillation frequency setting method for the oscillator Jan. 8, 2002
6337603 Temperature detector circuit having function for restricting occurrence of output error caused by dispersion in element manufacture Jan. 8, 2002
6337604 Crystal oscillator Jan. 8, 2002
6329884 Oscillator circuit with current limiting devices Dec. 11, 2001
6320474 MOS-type capacitor and integrated circuit VCO using same Nov. 20, 2001
6320473 Integrated oscillator circuit apparatus with capacitive coupling for reducing start-up voltage Nov. 20, 2001
6320471 Method and device for computer supported determination of an oscillating region of an electrical circuit Nov. 20, 2001
6313712 Low power crystal oscillator having improved long term and short term stability Nov. 6, 2001
6304152 Digital-control Colpitts oscillator circuit Oct. 16, 2001
6304151 Crystal oscillator and method of fabricating the same Oct. 16, 2001
6294964 High-stability piezoelectric oscillator Sep. 25, 2001
6292002 Crystal resonant frequency sensor Sep. 18, 2001

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










 
 
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