Charles A. Bollfrass

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for forming a ventable seal
- Patent number 5,029,906
- Issue date Jul 9, 1991
- Baker Hughes Incorporated
- K. Darrel Chelette
- E21 - EARTH DRILLING MINING
Information Patent Grant
Elastomeric guard seal for tubular connections
- Patent number 4,928,999
- Issue date May 29, 1990
- Hydril Company
- L. Steven Landriault
- E21 - EARTH DRILLING MINING
Information Patent Grant
Tubular coupling with ventable seal
- Patent number 4,893,844
- Issue date Jan 16, 1990
- Baker Hughes Incorporated
- K. Darrel Chelette
- E21 - EARTH DRILLING MINING
Information Patent Grant
Threaded pipe connection
- Patent number 4,588,213
- Issue date May 13, 1986
- Thread Technology International, Inc.
- Charles A. Bollfrass
- E21 - EARTH DRILLING MINING
Information Patent Grant
Threaded connector
- Patent number 4,373,754
- Issue date Feb 15, 1983
- Hydril Company
- Charles A. Bollfrass
- E21 - EARTH DRILLING MINING
Information Patent Grant
Treating, including induction heating of well pipe connections
- Patent number 4,133,095
- Issue date Jan 9, 1979
- Hydril Company
- George E. Lewis
- E21 - EARTH DRILLING MINING