TREA

William W. Dollison

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  • Dallas, TX, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Flapper valve assembly with floating hinge
    • Patent number 5,310,005
    • Issue date May 10, 1994
    • Halliburton Company
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Casing shut-in valve system
    • Patent number 5,145,005
    • Issue date Sep 8, 1992
    • Otis Engineering Corporation
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Flow actuated safety valve
    • Patent number 5,141,023
    • Issue date Aug 25, 1992
    • Otis Engineering Corporation
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary running tool for rotary lock mandrel
    • Patent number 5,133,404
    • Issue date Jul 28, 1992
    • Otis Engineering Corporation
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Flow actuated safety valve with retrievable choke and metal seals
    • Patent number 5,095,994
    • Issue date Mar 17, 1992
    • Otis Engineering Corportion
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Rotary locking system with metal seals
    • Patent number 5,082,061
    • Issue date Jan 21, 1992
    • Otis Engineering Corporation
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Expendable devices for well lock system
    • Patent number 4,969,515
    • Issue date Nov 13, 1990
    • Otis Engineering Corporation
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Friction-reducing device
    • Patent number 4,919,205
    • Issue date Apr 24, 1990
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Foot valve for pumping wells
    • Patent number 4,776,401
    • Issue date Oct 11, 1988
    • Otis Engineering Corporation
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Position responsive valve control for hydraulic cylinder
    • Patent number 4,693,171
    • Issue date Sep 15, 1987
    • Otis Engineering Corporation
    • William W. Dollison
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Hydraulic well pump
    • Patent number 4,691,511
    • Issue date Sep 8, 1987
    • Otis Engineering Corporation
    • William W. Dollison
    • F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
  • Information Patent Grant

    Hydraulic control circuit and valve assembly
    • Patent number 4,680,930
    • Issue date Jul 21, 1987
    • Otis Engineering Corporation
    • William W. Dollison
    • F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
  • Information Patent Grant

    Hydraulic well pump
    • Patent number 4,571,939
    • Issue date Feb 25, 1986
    • Otis Engineering Corporation
    • William W. Dollison
    • F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
  • Information Patent Grant

    Control of continuous reciprocation of a fluid power cylinder
    • Patent number 4,491,055
    • Issue date Jan 1, 1985
    • Otis Engineering Corporation
    • William W. Dollison
    • F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
  • Information Patent Grant

    Tool diverter
    • Patent number 4,312,378
    • Issue date Jan 26, 1982
    • Otis Engineering Corporation
    • William W. Dollison
    • E21 - EARTH DRILLING MINING
  • Information Patent Grant

    Tool diverter
    • Patent number 4,252,149
    • Issue date Feb 24, 1981
    • Otis Engineering Corporation
    • William W. Dollison
    • E21 - EARTH DRILLING MINING