Rolf Dirdal

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Patents Grantslast 30 patents

Information Patent Grant
Method and system for testing a borehole by the use of a movable plug
- Patent number 6,631,763
- Issue date Oct 14, 2003
- Den Norske Stats Oljeselskap A.S.
- John Self
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
ASSEMBLY FOR PRESSURE CONTROL WHEN DRILLING AND METHOD TO CONTROL P...
- Publication number 20100006282
- Publication date Jan 14, 2010
- Rolf Dirdal
- E21 - EARTH DRILLING MINING