Svein Stubstad

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Top drives with shaft multi-seal
- Patent number 7,748,473
- Issue date Jul 6, 2010
- National-Oilwell Varco, L.P.
- Lawrence E. Wells
- E21 - EARTH DRILLING MINING
Information Patent Grant
Multi-seal for top drive shaft
- Patent number 7,487,848
- Issue date Feb 10, 2009
- Varco I/P, Inc.
- Larry Wells
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Top drive systems
- Patent number 7,401,664
- Issue date Jul 22, 2008
- Varco I/P
- Lawrence E. Wells
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Top drives with shaft multi-seal
- Publication number 20090044982
- Publication date Feb 19, 2009
- Lawrence E. Wells
- E21 - EARTH DRILLING MINING
Information Patent Application
Top drive washpipe system
- Publication number 20080230274
- Publication date Sep 25, 2008
- Svein Stubstad
- E21 - EARTH DRILLING MINING
Information Patent Application
Multi-seal for top drive shaft
- Publication number 20070251705
- Publication date Nov 1, 2007
- Lawrence E. Wells
- E21 - EARTH DRILLING MINING
Information Patent Application
Top drive systems
- Publication number 20070251699
- Publication date Nov 1, 2007
- Lawrence E. Wells
- E21 - EARTH DRILLING MINING