Dag Haverstad

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Nodeland, NO

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Patents Grantslast 30 patents

Information Patent Grant
Top drive drilling apparatus
- Patent number 7,931,077
- Issue date Apr 26, 2011
- Aker Kvaerner MH AS
- Bjørn Rudshaug
- E21 - EARTH DRILLING MINING
Information Patent Grant
Top drive drilling apparatus
- Patent number 7,743,853
- Issue date Jun 29, 2010
- Aker Kvaerner MH AS
- Bjørn Rudshaug
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Top Drive Drilling Apparatus
- Publication number 20090166090
- Publication date Jul 2, 2009
- Bjorn Rudshaug
- E21 - EARTH DRILLING MINING
Information Patent Application
Top Drive Drilling Apparatus
- Publication number 20090084537
- Publication date Apr 2, 2009
- Bjorn Rudshaug
- E21 - EARTH DRILLING MINING