Paul E. Helfer

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Rotating drilling head with spaced apart seals
- Patent number 6,016,880
- Issue date Jan 25, 2000
- ABB Vetco Gray Inc.
- Douglas D. Hall
- E21 - EARTH DRILLING MINING
Information Patent Grant
Ram-type blowout preventer
- Patent number 4,655,431
- Issue date Apr 7, 1987
- Paul E. Helfer
- E21 - EARTH DRILLING MINING
Information Patent Grant
Valve apparatus
- Patent number 4,638,972
- Issue date Jan 27, 1987
- Koomey
- Marvin R. Jones
- E21 - EARTH DRILLING MINING
Information Patent Grant
Casing hanger
- Patent number 4,152,015
- Issue date May 1, 1979
- Cameron Iron Works, Inc.
- Marvin R. Jones
- E21 - EARTH DRILLING MINING
Information Patent Grant
Pipe disconnecting apparatus
- Patent number 4,057,887
- Issue date Nov 15, 1977
- Cameron Iron Works, Inc.
- Marvin R. Jones
- E21 - EARTH DRILLING MINING
Information Patent Grant
Pipe disconnecting apparatus
- Patent number 3,957,113
- Issue date May 18, 1976
- Cameron Iron Works, Inc.
- Marvin R. Jones
- E21 - EARTH DRILLING MINING