TREA

Kazushi Maruyama

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  • Kitakyushu, JP
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Patents Grantslast 30 patents

  • Information Patent Grant

    Pipe joint
    • Patent number 6,705,648
    • Issue date Mar 16, 2004
    • Nippon Steel Corporation
    • Kazushi Maruyama
    • F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
  • Information Patent Grant

    Oil well pipe threaded joint
    • Patent number 6,176,524
    • Issue date Jan 23, 2001
    • Nippon Steel Corporation
    • Eiji Tsuru
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Method of cooling steel pipes
    • Patent number 4,421,575
    • Issue date Dec 20, 1983
    • Nippon Steel Corporation
    • Kyohei Murata
    • C21 - METALLURGY OF IRON