Donald A. Thorssen

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Calgary, CA

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Patents Grantslast 30 patents

Information Patent Grant
Water-based drilling fluid deacidification process and apparatus
- Patent number 6,032,747
- Issue date Mar 7, 2000
- Underbalanced Drilling Systems Limited
- Eugene I. Moody
- E21 - EARTH DRILLING MINING
Information Patent Grant
Oil and gas well operation fluid used for the solvation of waxes an...
- Patent number 5,902,775
- Issue date May 11, 1999
- Trysol Ltd.
- Donald A. Thorssen
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Oil and gas well operation fluid used for the solvation of waxes an...
- Patent number 5,795,850
- Issue date Aug 18, 1998
- Trysol Limited
- Donald A. Thorssen
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Fire retarded solvents
- Patent number 5,207,953
- Issue date May 4, 1993
- Trisol Inc.
- Donald A. Thorssen
- F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS