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Keiji Oya

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  • Saitama-Ken, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Optical recording medium and optical recording-reproducing method u...
    • Patent number 8,029,976
    • Issue date Oct 4, 2011
    • Sony Corporation
    • Yutaka Wada
    • G11 - INFORMATION STORAGE
  • Information Patent Grant

    Optical recording medium
    • Patent number 7,316,836
    • Issue date Jan 8, 2008
    • Sony Corporation
    • Yutaka Wada
    • G11 - INFORMATION STORAGE
  • Information Patent Grant

    Heat-sensitive recording material
    • Patent number 5,728,646
    • Issue date Mar 17, 1998
    • Asahi Denka Kogyo Kabushiki Kaisha
    • Nobuhide Tominaga
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
  • Information Patent Grant

    Heat-sensitive recording material
    • Patent number 5,607,894
    • Issue date Mar 4, 1997
    • Asahi Denka Kogyo Kabushiki Kaisha
    • Mitsuo Akutsu
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
  • Information Patent Grant

    Heat-sensitive recording material
    • Patent number 5,081,099
    • Issue date Jan 14, 1992
    • Adeka Argus Chemical Co., Ltd.
    • Mitsuo Akutsu
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
  • Information Patent Grant

    Heat-sensitive recording material
    • Patent number 4,980,336
    • Issue date Dec 25, 1990
    • Adeka Argus Chemical Co., Ltd.
    • Mitsuo Akutsu
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
  • Information Patent Grant

    Optical recording material
    • Patent number 4,944,980
    • Issue date Jul 31, 1990
    • Adeka Argus Chemical Co., Ltd.
    • Mitsuo Akutsu
    • C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
  • Information Patent Grant

    Heat-sensitive recording material
    • Patent number 4,918,046
    • Issue date Apr 17, 1990
    • Adeka Argus Chemical Co., Ltd.
    • Mitsuo Akutsu
    • B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS

Patents Applicationslast 30 patents