TREA

Masaharu Kamigaki

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Key telephone system
    • Patent number 5,025,441
    • Issue date Jun 18, 1991
    • Iwatsu Electric Company, Ltd.
    • Masaharu Kamigaki
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Data circuit-terminating equipment
    • Patent number 4,905,258
    • Issue date Feb 27, 1990
    • Iwatsu Electric Co., Ltd.
    • Toshimichi Shimatani
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Noise removing circuit
    • Patent number 4,775,840
    • Issue date Oct 4, 1988
    • Iwatsu Electric Co., Ltd.
    • Hideharu Ohmori
    • G01 - MEASURING TESTING
  • Information Patent Grant

    Conference system
    • Patent number 4,726,016
    • Issue date Feb 16, 1988
    • Iwatsu Electric Clock Co., Ltd.
    • Seiya Uchida
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Time division multiplex data transfer system and method for telepho...
    • Patent number 4,658,397
    • Issue date Apr 14, 1987
    • Iwatsu Electric Co., Ltd.
    • Masataka Kawamura
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE