TREA

Paul W. Black

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  • Houston, TX, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Fluid level controlled safety valve
    • Patent number 4,721,162
    • Issue date Jan 26, 1988
    • Camco, Incorporated
    • Ronald E. Pringle
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Locking annulus safety valve
    • Patent number 4,538,685
    • Issue date Sep 3, 1985
    • Camco, Incorporated
    • Ronald E. Pringle
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Annular flow control safety valve
    • Patent number 4,273,194
    • Issue date Jun 16, 1981
    • Camco, Incorporated
    • Ronald E. Pringle
    • E21 - EARTH DRILLING MINING