John C. Zimmerman

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Duncan, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Anti-rotation method and apparatus for limiting rotation of cementi...
- Patent number 6,997,253
- Issue date Feb 14, 2006
- Halliburton Energy Services, Inc.
- Earl D. Webb
- E21 - EARTH DRILLING MINING
Information Patent Grant
Differential pressure operated circulating and deflation valve
- Patent number 5,355,959
- Issue date Oct 18, 1994
- Halliburton Company
- Jeffrey S. Walter
- E21 - EARTH DRILLING MINING
Information Patent Grant
Ball type shut in tool
- Patent number 4,470,465
- Issue date Sep 11, 1984
- Halliburton Company
- John C. Zimmerman
- E21 - EARTH DRILLING MINING
Information Patent Grant
Hydraulic set high temperature isolation packer
- Patent number 4,438,933
- Issue date Mar 27, 1984
- Halliburton Company
- John C. Zimmerman
- E21 - EARTH DRILLING MINING
Information Patent Grant
Check valve assembly
- Patent number 4,328,866
- Issue date May 11, 1982
- Halliburton Company
- John C. Zimmerman
- E21 - EARTH DRILLING MINING
Information Patent Grant
Oil well testing string bypass valve
- Patent number 4,258,793
- Issue date Mar 31, 1981
- Halliburton Company
- Thomas E. McGraw
- E21 - EARTH DRILLING MINING
Information Patent Grant
Valve closing method and apparatus for use with an oil well valve
- Patent number 4,144,937
- Issue date Mar 20, 1979
- Halliburton Company
- Gerald D. Jackson
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Anti-rotation method and apparatus for limiting rotation of cementi...
- Publication number 20040261991
- Publication date Dec 30, 2004
- Earl D. Webb
- E21 - EARTH DRILLING MINING
Information Patent Application
Anti-rotation method and apparatus for limiting rotation of cementi...
- Publication number 20040016538
- Publication date Jan 29, 2004
- Charles A. Butterfield
- E21 - EARTH DRILLING MINING