TREA

Koji Takayama

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Electret microphone
    • Patent number 6,898,292
    • Issue date May 24, 2005
    • Citizen Electronics Co., Ltd.
    • Haruhisa Tanabe
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Electret microphone
    • Patent number 6,744,896
    • Issue date Jun 1, 2004
    • Citizen Electronics Co., Ltd.
    • Haruhisa Tanabe
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

  • Information Patent Application

    Electret microphone
    • Publication number 20030068055
    • Publication date Apr 10, 2003
    • CITIZEN ELECTRONICS CO., LTD.
    • Haruhisa Tanabe
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    Electret microphone
    • Publication number 20020172385
    • Publication date Nov 21, 2002
    • CITIZEN ELECTRONICS CO., LTD.
    • Haruhisa Tanabe
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE