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Ryoji Iwakura

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  • Tokorozawa, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Electric timepiece
    • Patent number 7,436,737
    • Issue date Oct 14, 2008
    • Citizen Holdings Co., Ltd.
    • Masami Fukuda
    • G01 - MEASURING TESTING
  • Information Patent Grant

    Timer of electric timepiece
    • Patent number 6,894,952
    • Issue date May 17, 2005
    • Citizen Watch Co., Ltd.
    • Shigeru Morokawa
    • G04 - HOROLOGY
  • Information Patent Grant

    Charging circuit
    • Patent number 6,853,219
    • Issue date Feb 8, 2005
    • Citizen Watch Co., Ltd.
    • Katsuyoshi Aihara
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Crystal oscillator circuit using CMOSFETs
    • Patent number 6,727,769
    • Issue date Apr 27, 2004
    • Citizen Watch Co., Ltd.
    • Katsuyoshi Aihara
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Electronic timepiece having improved primary frequency divider resp...
    • Patent number 4,433,920
    • Issue date Feb 28, 1984
    • Citizen Watch Company Limited
    • Fukuo Sekiya
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Electronic timepiece with gain/loss adjustment
    • Patent number 4,370,067
    • Issue date Jan 25, 1983
    • Citizen Watch Company Limited
    • Ryoji Iwakura
    • G04 - HOROLOGY
  • Information Patent Grant

    FET Quartz oscillators
    • Patent number 4,346,350
    • Issue date Aug 24, 1982
    • Citizen Watch Co., Ltd.
    • Shigeru Morokawa
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Grant

    Electronic timepiece
    • Patent number 4,173,117
    • Issue date Nov 6, 1979
    • Citizen Watch Co., Ltd.
    • Kazutoshi Takahashi
    • G04 - HOROLOGY

Patents Applicationslast 30 patents

  • Information Patent Application

    Electric timepiece
    • Publication number 20050002277
    • Publication date Jan 6, 2005
    • Masami Fukuda
    • G04 - HOROLOGY
  • Information Patent Application

    Charging circuit
    • Publication number 20040155697
    • Publication date Aug 12, 2004
    • Katsuyoshi Aihara
    • G04 - HOROLOGY
  • Information Patent Application

    Timer of electric timepiece
    • Publication number 20040062147
    • Publication date Apr 1, 2004
    • Shigeru Morokawa
    • G04 - HOROLOGY
  • Information Patent Application

    Crystal oscillator circuit using CMOSFETs
    • Publication number 20020180542
    • Publication date Dec 5, 2002
    • CITIZEN WATCH CO., LTD.
    • Katsuyoshi Aihara
    • H03 - BASIC ELECTRONIC CIRCUITRY