David L. O'Donnell

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Blowout preventer with ram wedge locks
- Patent number 5,575,452
- Issue date Nov 19, 1996
- Varco Shaffer, Inc.
- Melvyn F. Whitby
- E21 - EARTH DRILLING MINING
Information Patent Grant
Hydraulically controlled blowout preventer
- Patent number 5,505,426
- Issue date Apr 9, 1996
- Varco Shaffer, Inc.
- Melvyn F. Whitby
- E21 - EARTH DRILLING MINING
Information Patent Grant
Oilfield tubular shear ram and method for blowout prevention
- Patent number 5,400,857
- Issue date Mar 28, 1995
- Varco Shaffer, Inc.
- Melvyn F. Whitby
- E21 - EARTH DRILLING MINING