TREA

Rikio Sato

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  • Tokyo, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Negative-sequence time-overcurrent relay
    • Patent number 5,475,559
    • Issue date Dec 12, 1995
    • Kabushiki Kaisha Toshiba
    • Kazuhiro Suzuki
    • H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • Information Patent Grant

    Key telephone system
    • Patent number 4,602,132
    • Issue date Jul 22, 1986
    • NEC Corporation
    • Kazuyuki Nagatomi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE
  • Information Patent Grant

    Key telephone system
    • Patent number 4,595,800
    • Issue date Jun 17, 1986
    • NEC Corporation
    • Kazuyuki Nagatomi
    • H04 - ELECTRIC COMMUNICATION TECHNIQUE