TREA

Ken Yoshizawa

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  • Ibaragi, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Optical disc manufacturing method
    • Patent number 5,273,598
    • Issue date Dec 28, 1993
    • Hitachi Maxell, Ltd.
    • Toshio Higasihara
    • G11 - INFORMATION STORAGE
  • Information Patent Grant

    Optical disc
    • Patent number 4,911,968
    • Issue date Mar 27, 1990
    • Hitachi Maxell, Ltd.
    • Tosio Higasihara
    • G11 - INFORMATION STORAGE
  • Information Patent Grant

    Optical recording disc
    • Patent number 4,710,913
    • Issue date Dec 1, 1987
    • Hitachi Maxell, Ltd.
    • Seiichi Matsushima
    • G11 - INFORMATION STORAGE