Donald E. Carrens

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Tulsa, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Valving system for a downhole hydraulically actuated pump
- Patent number 6,948,917
- Issue date Sep 27, 2005
- Donald Carrens
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Down hole hydraulically actuated pump
- Patent number 4,925,374
- Issue date May 15, 1990
- Donald E. Carrens
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Pump piston having ring lubrication means
- Patent number 4,350,082
- Issue date Sep 21, 1982
- Dresser Industries, Inc.
- Donald E. Carrens
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Reversing valve assembly for a fluid operated well pump
- Patent number 4,293,287
- Issue date Oct 6, 1981
- Dresser Industries, Inc.
- Donald E. Carrens
- F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
Information Patent Grant
Seal assembly
- Patent number 4,174,112
- Issue date Nov 13, 1979
- Dresser Industries, Inc.
- Donald E. Carrens
- E21 - EARTH DRILLING MINING