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Class Information
Number: 368/200
Name: Horology: time measuring systems or devices > Regulating means > For adjusting the frequency or beat
Description: Subject matter comprising means to control the rate of regularly recurring events in the operation of a timepiece.










Sub-classes under this class:

Class Number Class Name Patents
368/201 Of frequency divider 80


Patents under this class:
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Patent Number Title Of Patent Date Issued
8610381 Voltage determination device and clock control device Dec. 17, 2013
8550700 Clock movement containing a constant force device Oct. 8, 2013
8392001 Method and apparatus for externally aided self adjusting real time clock Mar. 5, 2013
8344814 Circuit and method for generating a clock signal Jan. 1, 2013
8251575 Electronic timepiece Aug. 28, 2012
7854544 Correction apparatus and clock device using the same Dec. 21, 2010
7455447 Method and apparatus for a portable device Nov. 25, 2008
7118269 Method of correcting a real-time clock of an electronic apparatus Oct. 10, 2006
6956793 Phase clock selector for generating a non-integer frequency division Oct. 18, 2005
6616328 High accuracy timepiece Sep. 9, 2003
6449217 Low cost clock Sep. 10, 2002
6304517 Method and apparatus for real time clock frequency error correction Oct. 16, 2001
5881022 Frequency shifing device and method for automatic clock adjustment Mar. 9, 1999
5825172 Continuous up/down spectrum scaling of signals Oct. 20, 1998
5740129 Real time clock Apr. 14, 1998
5717661 Method and apparatus for adjusting the accuracy of electronic timepieces Feb. 10, 1998
5596554 Set operation in a timepiece having an electrooptical display Jan. 21, 1997
5546363 Clock apparatus for forming time information for use in computer system Aug. 13, 1996
5481507 Electronic timekeeping device reduced adjustment data storage requirement Jan. 2, 1996
5440313 GPS synchronized frequency/time source Aug. 8, 1995
5412624 Real-life timer interval adjustment May. 2, 1995
5375105 Timekeeping rate regulator for crystal controlled watches and clocks Dec. 20, 1994
5274545 Device and method for providing accurate time and/or frequency Dec. 28, 1993
5255247 Electronic timepiece including integrated circuitry Oct. 19, 1993
5253229 Electronic timepiece including integrated circuitry Oct. 12, 1993
5218694 Dual selection system for reference frequency for use in a clock Jun. 8, 1993
5128909 Advanced clock measurement system Jul. 7, 1992
4953148 Elimination of magnetic influence on atomic clocks Aug. 28, 1990
4943955 Atomic clock Jul. 24, 1990
4933920 Sidereal clock Jun. 12, 1990
4921467 Local oscillators for radio receivers May. 1, 1990
4903251 Accuracy adjustment for time-of-day clock using a microcontroller Feb. 20, 1990
4845692 Clocking device of substantially constant stability for short-term and long-term time measurement Jul. 4, 1989
4763309 Programming arrangement for a non-volatile memory for a timepiece Aug. 9, 1988
4737944 Electronic timepiece Apr. 12, 1988
4730286 Circuit and method for correcting the rate of an electronic timepiece Mar. 8, 1988
4708491 Time of day clock Nov. 24, 1987
4644484 Stand-alone access control system clock control Feb. 17, 1987
4634288 Auxiliary timing source for ac-powered electronic clocks Jan. 6, 1987
4633422 Apparatus for and method of compensating for variations due to aging Dec. 30, 1986
4537515 Resonator temperature compensated time base and watch using said time base Aug. 27, 1985
4502790 Electronic timepiece Mar. 5, 1985
4461582 Circuit arrangement for adjusting a pulse frequency of a quartz-controlled watch or clock Jul. 24, 1984
4451159 Electronic watch May. 29, 1984
4427302 Timekeeping signal source for an electronic timepiece Jan. 24, 1984
4417820 Time-keeping device, especially a quartz-controlled clock Nov. 29, 1983
4408897 Electronic timepiece having a digital frequency correction circuit Oct. 11, 1983
4407589 Error correction method and apparatus for electronic timepieces Oct. 4, 1983
4407019 Electronic wristwatch Sep. 27, 1983
4400093 Method for inspecting the running of a timepiece and timepiece adapted for such method Aug. 23, 1983

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