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Tetsuji Muraoka

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  • Fukuoka, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Microphone unit
    • Patent number 10,455,310
    • Issue date Oct 22, 2019
    • Hosiden Corporation
    • Keina Tsutsui
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

  • Information Patent Application

    MICROPHONE UNIT
    • Publication number 20180242067
    • Publication date Aug 23, 2018
    • HOSIDEN CORPORATION
    • Keina TSUTSUI
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Application

    Electret Condenser Microphone
    • Publication number 20130094676
    • Publication date Apr 18, 2013
    • HOSIDEN CORPORATION
    • Tetsuji Muraoka
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE