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by closing a contact to put into action electro-acoustic means

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  • CPC
  • G04C21/28
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Parent Industries

GPHYSICS G04Horology G04CELECTROMECHANICAL CLOCKS OR WATCHES G04C21/00Producing acoustic time signals by electrical means

Current Industry

G04C21/28by closing a contact to put into action electro-acoustic means
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Patents Grantslast 30 patents

  • Information Patent Grant

    Quartz clock type timer movement
    • Patent number 10,915,068
    • Issue date Feb 9, 2021
    • HANGZHOU JINGCHENG SANHE TIMER INDUSTRY CO., LTD.
    • Hanjun Chi
    • G04 - HOROLOGY
  • Information Patent Grant

    Method and system for managing an alarm signal, alarm clock compris...
    • Patent number 9,046,877
    • Issue date Jun 2, 2015
    • WOOX Innovations Belgium NV
    • Kin-Wa Tang
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    Alarm clock having on-off switch timer
    • Patent number 5,757,732
    • Issue date May 26, 1998
    • Chu-Rong Kuo
    • G04 - HOROLOGY
  • Information Patent Grant

    Truck driver's wake-up device
    • Patent number 4,999,821
    • Issue date Mar 12, 1991
    • Ephraim A. Kirkland
    • G04 - HOROLOGY
  • Information Patent Grant

    Alarm switch for an alarm circuit in a horological device
    • Patent number 4,199,930
    • Issue date Apr 29, 1980
    • The Gillette Company
    • Jean-Philippe Lebet
    • G04 - HOROLOGY
  • Information Patent Grant

    Switching circuit for power supply to electronic apparatus
    • Patent number 3,949,240
    • Issue date Apr 6, 1976
    • Sony Corporation
    • Takahiko Saito
    • G04 - HOROLOGY
  • Information Patent Grant

    Control circuit for use with amplifier
    • Patent number 3,938,047
    • Issue date Feb 10, 1976
    • Sony Corporation
    • Taiwa Okanobu
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    3924399
    • Patent number 3,924,399
    • Issue date Dec 9, 1975
    • G04 - HOROLOGY
  • Information Patent Grant

    3873921
    • Patent number 3,873,921
    • Issue date Mar 25, 1975
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    3835640
    • Patent number 3,835,640
    • Issue date Sep 17, 1974
    • G04 - HOROLOGY
  • Information Patent Grant

    3825836
    • Patent number 3,825,836
    • Issue date Jul 23, 1974
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    3824789
    • Patent number 3,824,789
    • Issue date Jul 23, 1974
    • G04 - HOROLOGY
  • Information Patent Grant

    3770176
    • Patent number 3,770,176
    • Issue date Nov 6, 1973
    • G11 - INFORMATION STORAGE
  • Information Patent Grant

    3737598
    • Patent number 3,737,598
    • Issue date Jun 5, 1973
    • G04 - HOROLOGY
  • Information Patent Grant

    3735063
    • Patent number 3,735,063
    • Issue date May 22, 1973
    • G04 - HOROLOGY
  • Information Patent Grant

    3710137
    • Patent number 3,710,137
    • Issue date Jan 9, 1973
    • G06 - COMPUTING CALCULATING COUNTING
  • Information Patent Grant

    3691752
    • Patent number 3,691,752
    • Issue date Sep 19, 1972
    • G04 - HOROLOGY
  • Information Patent Grant

    3681916
    • Patent number 3,681,916
    • Issue date Aug 8, 1972
    • G04 - HOROLOGY
  • Information Patent Grant

    3653040
    • Patent number 3,653,040
    • Issue date Mar 28, 1972
    • G08 - SIGNALLING
  • Information Patent Grant

    3577004
    • Patent number 3,577,004
    • Issue date May 4, 1971
    • G04 - HOROLOGY
  • Information Patent Grant

    3496438
    • Patent number 3,496,438
    • Issue date Feb 17, 1970
    • G04 - HOROLOGY
  • Information Patent Grant

    3420051
    • Patent number 3,420,051
    • Issue date Jan 7, 1969
    • G04 - HOROLOGY
  • Information Patent Grant

    3376700
    • Patent number 3,376,700
    • Issue date Apr 9, 1968
    • G04 - HOROLOGY
  • Information Patent Grant

    3361973
    • Patent number 3,361,973
    • Issue date Jan 2, 1968
    • G04 - HOROLOGY
  • Information Patent Grant

    3361974
    • Patent number 3,361,974
    • Issue date Jan 2, 1968
    • G04 - HOROLOGY
  • Information Patent Grant

    3356949
    • Patent number 3,356,949
    • Issue date Dec 5, 1967
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    3341841
    • Patent number 3,341,841
    • Issue date Sep 12, 1967
    • G08 - SIGNALLING
  • Information Patent Grant

    3337806
    • Patent number 3,337,806
    • Issue date Aug 22, 1967
    • G04 - HOROLOGY
  • Information Patent Grant

    3328953
    • Patent number 3,328,953
    • Issue date Jul 4, 1967
    • G04 - HOROLOGY
  • Information Patent Grant

    3318084
    • Patent number 3,318,084
    • Issue date May 9, 1967
    • G04 - HOROLOGY

Patents Applicationslast 30 patents