John W. Tokar

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Sherwood Park, CA

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Patents Grantslast 30 patents

Information Patent Grant
Downhole tool retention apparatus
- Patent number 6,691,776
- Issue date Feb 17, 2004
- Weatherford International, Inc.
- Brett W. Guillory
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Downhole tool retention apparatus
- Publication number 20030098155
- Publication date May 29, 2003
- Brett W. Guillory
- E21 - EARTH DRILLING MINING