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Patents Grantslast 30 patents

Information Patent Grant
Fluid erosion protection washer for rotating shaft in MWD tool
- Patent number 7,839,719
- Issue date Nov 23, 2010
- Schlumberger Technology Corporation
- Anthony R. Dopf
- E21 - EARTH DRILLING MINING
Information Patent Grant
Fluid erosion protection washer for rotating shaft in MWD tool
- Patent number 7,532,540
- Issue date May 12, 2009
- Extreme Engineering Ltd.
- Anthony R. Dopf
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
FLUID EROSION PROTECTION WASHER FOR ROTATING SHAFT IN MWD TOOL
- Publication number 20090224193
- Publication date Sep 10, 2009
- SCHLUMBERGER TECHNOLOGY CORPORATION
- Anthony R. Dopf
- E21 - EARTH DRILLING MINING
Information Patent Application
Fluid erosion protection washer for rotating shaft in MWD tool
- Publication number 20070045583
- Publication date Mar 1, 2007
- Anthony R. Dopf
- E21 - EARTH DRILLING MINING