James E. Coffman

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Tulsa, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Drilling systems
- Patent number 7,040,417
- Issue date May 9, 2006
- CCT Technologies, L.L.C.
- Paul B. Campbell
- E21 - EARTH DRILLING MINING
Information Patent Grant
Percussion drill assembly
- Patent number 6,047,778
- Issue date Apr 11, 2000
- Dresser-Rand Company
- James E. Coffman
- E21 - EARTH DRILLING MINING
Information Patent Grant
Percussion drill assembly
- Patent number 5,957,220
- Issue date Sep 28, 1999
- Dresser-Rand Company
- James E. Coffman
- E21 - EARTH DRILLING MINING
Information Patent Grant
Percussion drill assembly
- Patent number 5,662,180
- Issue date Sep 2, 1997
- Dresser-Rand Company
- James E. Coffman
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Drilling systems
- Publication number 20050126822
- Publication date Jun 16, 2005
- Paul B. Campbell
- E21 - EARTH DRILLING MINING