TREA

Larry F. Grohman

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  • Spring, TX, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Subsurface safety valve
    • Patent number 4,603,742
    • Issue date Aug 5, 1986
    • Hydril Company
    • Fred S. Wong
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Subsurface safety valve
    • Patent number 4,552,219
    • Issue date Nov 12, 1985
    • Hydril Company
    • Fred S. Wong
    • E21 - EARTH DRILLING MINING