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Class Information
Number: 368/159
Name: Horology: time measuring systems or devices > Electrical time base > Solid state oscillating circuit type > For reciprocating or oscillating element > Crystal
Description: Subject matter wherein the element is a crystal.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8149651 Resonator mounted in a case incorporating a watch module Apr. 3, 2012
7679466 Counter-based resonator frequency compensation Mar. 16, 2010
7668041 Apparatus and methods for acquiring seismic data while tripping Feb. 23, 2010
7660201 Autonomous seismic data acquisition unit Feb. 9, 2010
7652545 System and method of calibrating real time clock utilizing average calibration Jan. 26, 2010
7583565 Electronic timepiece Sep. 1, 2009
7472032 Adaptive multi-axis sensor array Dec. 30, 2008
7046584 Compensated ensemble crystal oscillator for use in a well borehole system May. 16, 2006
6696899 Differential oscillator circuit including an electro-mechanical resonator Feb. 24, 2004
6147564 Oscillation circuit having electrostatic protective circuit Nov. 14, 2000
5929715 Oscillation circuit having electrostatic protective circuit Jul. 27, 1999
5325074 Oscillator with supply voltage changeover according to activated and disabled states of a microcomputer Jun. 28, 1994
5267379 Method of fabricating surface mountable clock oscillator module Dec. 7, 1993
5218694 Dual selection system for reference frequency for use in a clock Jun. 8, 1993
5172349 Electronic timepiece with analog display Dec. 15, 1992
4680514 Motor Jul. 14, 1987
4644445 Resin mounting structure for an integrated circuit Feb. 17, 1987
4641109 CMOS crystal controlled oscillator Feb. 3, 1987
4618837 Low-power consumption reference pulse generator Oct. 21, 1986
4600898 One-pin crystal oscillator Jul. 15, 1986
4459565 Low current electronic oscillator system Jul. 10, 1984
4427302 Timekeeping signal source for an electronic timepiece Jan. 24, 1984
RE31402 Electronic timepiece Oct. 4, 1983
4405906 Low power consumption C-MOS oscillator Sep. 20, 1983
4387349 Low power CMOS crystal oscillator Jun. 7, 1983
4387350 Watch circuit with oscillator gain control Jun. 7, 1983
4360789 Very low current pierce oscillator Nov. 23, 1982
4358839 Absolute digital clock system Nov. 9, 1982
4346350 FET Quartz oscillators Aug. 24, 1982
4325036 Temperature compensating circuit Apr. 13, 1982
4321562 Crystal oscillator circuit capable of changing the number of inverter stages coupled in series Mar. 23, 1982
4307354 Crystal oscillator circuit having rapid starting characteristics and a low power consumption Dec. 22, 1981
4242611 Methods and apparatus for providing ultra-stable frequency standards and clocks Dec. 30, 1980
4219754 Temperature compensation by positioning of plural piezoelectric vibrators in an electronic wristwatch Aug. 26, 1980
4218661 C-MOS crystal oscillator including circuit for temporarily increasing closed loop gain Aug. 19, 1980
4199726 Digitally tunable integrated circuit pulse generator and tuning system Apr. 22, 1980
4177631 Small-sized quartz crystal wristwatch Dec. 11, 1979
4157647 Hand reversing system for an electronic timepiece Jun. 12, 1979
4157007 Asymmetric digital watch module Jun. 5, 1979
4148183 Supporting structure for quartz oscillator Apr. 10, 1979
4148181 System for controlling the striking mechanism of a timepiece Apr. 10, 1979
4148184 Electronic timepiece utilizing main oscillator circuit and secondary oscillator circuit Apr. 10, 1979
4145872 Electronic watch Mar. 27, 1979
4145617 Control circuit for providing time selected application of A.C. power Mar. 20, 1979
4144706 Alarm watch with remote sonic generator Mar. 20, 1979
4143507 Battery operated electronic watch Mar. 13, 1979
4142287 Electrical devices such as watches and method of construction thereof Mar. 6, 1979
4142161 Crystal oscillator Feb. 27, 1979
4141209 Crystal controlled oscillator and method of tuning same Feb. 27, 1979
4133169 Electronic circuit for a quartz crystal watch Jan. 9, 1979

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