William T. Ilfrey

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Riser set-aside system
- Patent number 4,147,221
- Issue date Apr 3, 1979
- Exxon Production Research Company
- William T. Ilfrey
- E21 - EARTH DRILLING MINING
Information Patent Grant
Annular seal
- Patent number 4,131,287
- Issue date Dec 26, 1978
- Exxon Production Research Company
- Richard H. Gunderson
- E21 - EARTH DRILLING MINING
Information Patent Grant
Casing seal and blowout preventer tester and test method
- Patent number 4,090,395
- Issue date May 23, 1978
- Exxon Production Research Company
- William P. Dixon
- E21 - EARTH DRILLING MINING
Information Patent Grant
Self-supported drilling riser
- Patent number 3,999,617
- Issue date Dec 28, 1976
- Exxon Production Research Company
- William T. Ilfrey
- E21 - EARTH DRILLING MINING
Information Patent Grant
Marine riser
- Patent number 3,981,357
- Issue date Sep 21, 1976
- Exxon Production Research Company
- James M. Walker
- E21 - EARTH DRILLING MINING