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Keizo KUMAGAI

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Patents Grantslast 30 patents

Patents Applicationslast 30 patents

  • Information Patent Application

    PULSE SIGNAL SENDING CIRCUIT
    • Publication number 20210258002
    • Publication date Aug 19, 2021
    • MITSUMI ELECTRIC CO., LTD.
    • Keizo KUMAGAI
    • H03 - BASIC ELECTRONIC CIRCUITRY
  • Information Patent Application

    STEP-UP/DOWN DC-DC CONVERTER AND SWITCHING CONTROL CIRCUIT
    • Publication number 20120299568
    • Publication date Nov 29, 2012
    • Keizo Kumagai
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Application

    STEP-UP/DOWN DC-DC CONVERTER AND SWITCHING CONTROL CIRCUIT
    • Publication number 20120286749
    • Publication date Nov 15, 2012
    • MITSUMI ELECTRIC CO., LTD.
    • Keizo KUMAGAI
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Application

    SWITCHING POWER-SUPPLY UNIT
    • Publication number 20120105031
    • Publication date May 3, 2012
    • Mitsumi Electric Co., Ltd.
    • Keizo KUMAGAI
    • Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
  • Information Patent Application

    DC-DC CONVERTER
    • Publication number 20100102788
    • Publication date Apr 29, 2010
    • Mitsumi Electric Co. Ltd.
    • Masaki KUROYABU
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Application

    DC-DC CONVERTER
    • Publication number 20090315523
    • Publication date Dec 24, 2009
    • MITSUMI ELECTRIC CO., LTD.
    • Keizo KUMAGAI
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Application

    DIRECT-CURRENT POWER SUPPLY DEVICE, POWER SUPPLY DEVICE FOR DRIVING...
    • Publication number 20090174340
    • Publication date Jul 9, 2009
    • Mitsumi Electric Co., Ltd.
    • Keizo KUMAGAI
    • Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
  • Information Patent Application

    DIRECT-CURRENT POWER SUPPLY DEVICE, POWER SUPPLY DEVICE FOR DRIVING...
    • Publication number 20090174347
    • Publication date Jul 9, 2009
    • Mitsumi Electric Co., Ltd.
    • Keizo Kumagai
    • Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
  • Information Patent Application

    MULTI-OUTPUT TYPE DC/DC CONVERTER
    • Publication number 20070285072
    • Publication date Dec 13, 2007
    • MITSUMI ELECTRIC CO., LTD.
    • Keizo Kumagai
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Application

    Multi-ouput type DC/DC converter
    • Publication number 20070252563
    • Publication date Nov 1, 2007
    • Mitsumi Electric Co. Ltd.
    • Keizo Kumagai
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Application

    Multi-output type DC/DC converter with a constant on time interval...
    • Publication number 20060221649
    • Publication date Oct 5, 2006
    • Mitsumi Electric Co. Ltd.
    • Yuji Yamanaka
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Application

    Multi-output type DC/DC converter operable at a current discontinuo...
    • Publication number 20060220622
    • Publication date Oct 5, 2006
    • Mitsumi Electric Co. Ltd.
    • Yuji Yamanaka
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER