John M. Elsen

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Tulsa, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Drilling fluid additives for use in hard brine environments
- Patent number 4,743,383
- Issue date May 10, 1988
- Phillips Petroleum Company
- Wayne S. Stewart
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...