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Akira Yokoyama

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  • Otake, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Method for producing electret filter
    • Patent number 5,246,637
    • Issue date Sep 21, 1993
    • Mitsui Petrochemical Industries, Ltd.
    • Satoshi Matsuura
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Fiber reinforced heat-resistant polyolefin compositions
    • Patent number 5,039,730
    • Issue date Aug 13, 1991
    • Mitsui Petrochemical Industries, Ltd.
    • Akira Yokoyama
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
  • Information Patent Grant

    Thermoplastic resin composition
    • Patent number 4,670,508
    • Issue date Jun 2, 1987
    • Mitsui Petrochemical Industries Ltd.
    • Akio Ohdaira
    • C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...