TREA

Kyoji YOSHIKAWA

Follow

Person

  • Kokubunji-shi, Tokyo, JP
People

Patents Grantslast 30 patents

  • Information Patent Grant

    Earphone
    • Patent number D938594
    • Issue date Dec 14, 2021
    • RION CO., LTD.
    • Takashi Iwakura
    • D24 - Medical and laboratory equipment
  • Information Patent Grant

    Electroacoustic transducer and acoustic device
    • Patent number 11,184,720
    • Issue date Nov 23, 2021
    • Rion Co., Ltd.
    • Kyoji Yoshikawa
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents