TREA

Toyokazu Okada

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  • Osaka, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Projection screen having a plural number of light control layers
    • Patent number 7,586,680
    • Issue date Sep 8, 2009
    • Sumitomo Chemical Company, Limited
    • Toyokazu Okada
    • G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
  • Information Patent Grant

    Dye-containing light-polarizing film
    • Patent number 5,310,509
    • Issue date May 10, 1994
    • Sumitomo Chemical Company, Limited
    • Toyokazu Okada
    • G02 - OPTICS
  • Information Patent Grant

    Phase retarder and process for producing the same
    • Patent number 5,285,303
    • Issue date Feb 8, 1994
    • Sumitomo Chemical Co., Ltd.
    • Toyokazu Okada
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Optical film
    • Patent number 5,244,713
    • Issue date Sep 14, 1993
    • Sumitomo Chemical Co., Ltd.
    • Kimishige Nakamura
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Light-polarizing films
    • Patent number 5,082,601
    • Issue date Jan 21, 1992
    • Sumitomo Chemical Co., Ltd.
    • Toyokazu Okada
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Phase retarder and liquid crystal display using the same
    • Patent number 5,061,042
    • Issue date Oct 29, 1991
    • Sumitomo Chemical Co., Ltd.
    • Kimishige Nakamura
    • G02 - OPTICS
  • Information Patent Grant

    Color liquid crystal displaying panels
    • Patent number 4,953,952
    • Issue date Sep 4, 1990
    • Sumitomo Chemical Company, Ltd.
    • Takuzo Okumura
    • G02 - OPTICS
  • Information Patent Grant

    Light-polarizing film
    • Patent number 4,895,677
    • Issue date Jan 23, 1990
    • Sumitomo Chemical Company, Limited
    • Takuzo Okumura
    • G02 - OPTICS
  • Information Patent Grant

    Light-polarizing film
    • Patent number 4,859,039
    • Issue date Aug 22, 1989
    • Sumitomo Chemical Company, Limited
    • Takuzo Okumura
    • G02 - OPTICS
  • Information Patent Grant

    Light-polarizing films
    • Patent number 4,802,745
    • Issue date Feb 7, 1989
    • Sumitomo Chemical Company, Limited
    • Toyokazu Okada
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Light-polarizing film
    • Patent number 4,803,014
    • Issue date Feb 7, 1989
    • Sumitomo Chemical Company Limited
    • Takuzo Okumura
    • G02 - OPTICS

Patents Applicationslast 30 patents

  • Information Patent Application

    Projection screen
    • Publication number 20050219692
    • Publication date Oct 6, 2005
    • Sumitomo Chemical Company, Limited
    • Toyokazu Okada
    • G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY