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Hidenori Yamaoka

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  • Yokohama, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Gaskets for use in internal combustion engines
    • Patent number 4,973,516
    • Issue date Nov 27, 1990
    • Nippon Carbon Co., Ltd.
    • Hidenori Yamaoka
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Valve sealing device and a valve
    • Patent number 4,269,391
    • Issue date May 26, 1981
    • Nippon Petrochemicals Co., Ltd.
    • Tutomu Saito
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...