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Ryozo Okumura

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  • Ichihara, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Aromatic vinyl polymer resin composition and its molding
    • Patent number 7,026,396
    • Issue date Apr 11, 2006
    • Idemitsu Kosan Co., Ltd.
    • Shogo Hirota
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Process for preparing polycarbonate
    • Patent number 5,650,480
    • Issue date Jul 22, 1997
    • Idemitsu Petrochemical Co., Ltd.
    • Ryozo Okumura
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Branched polycarbonate
    • Patent number 5,625,027
    • Issue date Apr 29, 1997
    • Idemitsu Petrochemical Co., Ltd.
    • Shigeki Kuze
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Process for producing a branched polycarbonate
    • Patent number 5,473,046
    • Issue date Dec 5, 1995
    • Idemitsu Petrochemical Co., Ltd.
    • Shigeki Kuze
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Process for producing polycarbonate having reduced residual chlorof...
    • Patent number 5,459,225
    • Issue date Oct 17, 1995
    • Idemitsu Petrochemical Co., Ltd.
    • Shigeki Kuze
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Polycarbonate-polyorganosiloxane copolymer and a resin composition
    • Patent number 5,451,632
    • Issue date Sep 19, 1995
    • Idemitsu Petrochemical Co., Ltd.
    • Ryozo Okumura
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Polycarbonate and process for producing the same
    • Patent number 5,349,043
    • Issue date Sep 20, 1994
    • Idemitsu Petrochemical Co., Ltd.
    • Shigeki Kuze
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Process for producing polycarbonate
    • Patent number 5,349,042
    • Issue date Sep 20, 1994
    • Idemitsu Petrochemical Co., Ltd.
    • Shigeki Kuze
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Polycarbonate copolymer and method for production thereof
    • Patent number 5,306,802
    • Issue date Apr 26, 1994
    • Idemitsu Petrochemical Co., Ltd.
    • Ryozo Okumura
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Process for producing styrenic polymer
    • Patent number 5,191,040
    • Issue date Mar 2, 1993
    • Idemitsu Petrochemical Co., Ltd.
    • Ryozo Okumura
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Thermoplastic resin composition
    • Patent number 4,957,964
    • Issue date Sep 18, 1990
    • Idemitsu Petrochemical Co., Ltd.
    • Ryozo Okumura
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...

Patents Applicationslast 30 patents