TREA

Shigeru Koizumi

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  • Kanagawa, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Computer housing
    • Patent number D394246
    • Issue date May 12, 1998
    • Hitachi, Ltd.
    • Takashi Yamamoto
    • D14 - Recording, communication, or information retrieval equipment
  • Information Patent Grant

    Method of actively controlling noise, and apparatus thereof
    • Patent number 5,689,572
    • Issue date Nov 18, 1997
    • Hitachi, Ltd.
    • Katsuo Ohki
    • G10 - MUSICAL INSTRUMENTS ACOUSTICS
  • Information Patent Grant

    Computer
    • Patent number D371347
    • Issue date Jul 2, 1996
    • Hitachi, Ltd.
    • Toshiyuki Utsuki
    • D14 - Recording, communication, or information retrieval equipment
  • Information Patent Grant

    Computer
    • Patent number D361060
    • Issue date Aug 8, 1995
    • Hitachi, Ltd.
    • Kennta Kumagaya
    • D14 - Recording, communication, or information retrieval equipment