David L. Richter

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Ponca City, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Rod insertion method and friction reducing device
- Patent number 5,265,466
- Issue date Nov 30, 1993
- Conoco Inc.
- David L. Richter
- E21 - EARTH DRILLING MINING
Information Patent Grant
Apparatus and method for obtaining subterranean samples
- Patent number 5,211,249
- Issue date May 18, 1993
- Conoco Inc.
- David L. Richter
- E21 - EARTH DRILLING MINING