Eric R. Schwelm

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Aberdeen, GB

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Patents Grantslast 30 patents

Information Patent Grant
Casing tension retainer
- Patent number 5,240,076
- Issue date Aug 31, 1993
- ABB Vetco Gray Inc.
- Stephen A. Cromar
- E21 - EARTH DRILLING MINING
Information Patent Grant
Casing tensioning mechanism for a casing hanger
- Patent number 5,002,131
- Issue date Mar 26, 1991
- Vetco Gray Inc.
- Stephen A. Cromar
- E21 - EARTH DRILLING MINING