Roy W. Rooyakkers

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Tananger, NO

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Patents Grantslast 30 patents

Information Patent Grant
Managed pressure drilling
- Patent number 8,955,619
- Issue date Feb 17, 2015
- Weatherford/Lamb, Inc.
- Frederick T. Tilton
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Managed pressure drilling
- Publication number 20060157282
- Publication date Jul 20, 2006
- Frederick T. Tilton
- E21 - EARTH DRILLING MINING