Horst Derwand

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Breidenbach, DE

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Patents Grantslast 30 patents

Information Patent Grant
Method and device for producing a cased string bore
- Patent number 7,849,937
- Issue date Dec 14, 2010
- Horst Derwand
- E21 - EARTH DRILLING MINING
Information Patent Grant
Method for removing an earth core out of a pipe laid in trench-less...
- Patent number 5,758,730
- Issue date Jun 2, 1998
- Horst Derwand
- B08 - CLEANING

Patents Applicationslast 30 patents

Information Patent Application
Method and device for producing a cased string bore
- Publication number 20080164066
- Publication date Jul 10, 2008
- Horst Derwand
- E21 - EARTH DRILLING MINING