TREA

James B. Renfroe Jr.

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  • Valencia, CA, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Apparatus and method for enhanced oil recovery
    • Patent number RE33614
    • Issue date Jun 18, 1991
    • Otis Engineering Corp.
    • Carl M. Schwab
    • 166 - Wells
  • Information Patent Grant

    Well valve
    • Patent number 4,834,176
    • Issue date May 30, 1989
    • Otis Engineering Corporation
    • James B. Renfroe
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Apparatus for enhanced oil recovery
    • Patent number 4,646,828
    • Issue date Mar 3, 1987
    • Otis Engineering Corporation
    • Carl M. Schwab
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Submersible pump safety systems
    • Patent number 4,632,184
    • Issue date Dec 30, 1986
    • Otis Engineering Corporation
    • James B. Renfroe
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Well apparatus
    • Patent number 4,624,310
    • Issue date Nov 25, 1986
    • Otis Engineering Corporation
    • Ralph H. Echols
    • E21 - EARTH DRILLING MINING