John M. Corben

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Sugar Land, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus to reduce trapped pressure in a downhole tool
- Patent number 6,588,508
- Issue date Jul 8, 2003
- Schlumberger Technology Corporation
- Robert A. Parrott
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Method and apparatus to reduce trapped pressure in a downhole tool
- Publication number 20020033264
- Publication date Mar 21, 2002
- Robert A. Parrott
- E21 - EARTH DRILLING MINING