TREA

Kei KOYAMA

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Earphone
    • Patent number D938595
    • Issue date Dec 14, 2021
    • RION CO., LTD.
    • Takashi Iwakura
    • D24 - Medical and laboratory equipment
  • Information Patent Grant

    Electromechanical transducer
    • Patent number 10,542,348
    • Issue date Jan 21, 2020
    • Rion Co., Ltd.
    • Takashi Iwakura
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

Patents Applicationslast 30 patents

  • Information Patent Application

    ELECTROMECHANICAL TRANSDUCER
    • Publication number 20180310101
    • Publication date Oct 25, 2018
    • Rion Co., Ltd.
    • Takashi IWAKURA
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER