| Patent | Date |
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Process for the treatment for chitinaceous materials and for the deacetylation of chitin
Grant 7,544,785 - Cowan , et al. June 9, 2 | 2009-06-09 |
Oil Base Fluids and Organophilic Tannin-Containing Compositions to Lower the Fluid Loss Thereof
App 20080171670 - Cowan; Jack C. ; et al. | 2008-07-17 |
Oil base fluids containing hydrophilic tannins
App 20060252652 - Cowan; Jack C. | 2006-11-09 |
Process for the treatment of chitinaceous materials and for the deacetylation of chitin
App 20060205932 - Cowan; Jack C. ; et al. | 2006-09-14 |
Anhydride-modified chitosan, method of preparation thereof, and fluids containing same
Grant 6,780,822 - Cowan , et al. August 24, 2 | 2004-08-24 |
Anhydride-modified chitosan, method of preparation thereof, and fluids containing same
App 20030153467 - Cowan, Jack C. ; et al. | 2003-08-14 |
Method for decreasing lost circulation during well operations using water absorbent polymers
App 20030141062 - Cowan, Jack C. ; et al. | 2003-07-31 |
Method of and composition for reducing the loss of fluid during well drilling, completion or workover operations
App 20010053749 - Cowan, Jack C. ; et al. | 2001-12-20 |
Chitosan-containing well drilling and servicing fluids
Grant 6,258,755 - House , et al. July 10, 2 | 2001-07-10 |
Aphron-containing oil base fluids and method of drilling a well therewith
Grant 6,156,708 - Brookey , et al. December 5, 2 | 2000-12-05 |
Method of releasing stuck pipe or tools and spotting fluids therefor
Grant 6,148,917 - Brookey , et al. November 21, 2 | 2000-11-21 |
Lightweight particulate cementitious materials and process for producing same
Grant 5,207,830 - Cowan , et al. May 4, 1 | 1993-05-04 |
Seepage loss reducing additive for well working compositions and uses thereof
Grant 5,076,944 - Cowan , et al. * December 31, 1 | 1991-12-31 |
Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor
Grant 5,071,575 - House , et al. * December 10, 1 | 1991-12-10 |
Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor
Grant 5,004,553 - House , et al. April 2, 1 | 1991-04-02 |
Organophilic clay compositions
Grant 4,960,740 - House , et al. October 2, 1 | 1990-10-02 |
Organophilic polymers
Grant 4,956,104 - Cowan , et al. September 11, 1 | 1990-09-11 |
Organophilic modified polymers
Grant 4,863,980 - Cowan , et al. September 5, 1 | 1989-09-05 |
Organophilic polyphenolic acid adducts
Grant 4,853,465 - Cowan , et al. August 1, 1 | 1989-08-01 |
Method and compositions for fluid loss and seepage loss control
Grant 4,531,594 - Cowan July 30, 1 | 1985-07-30 |
Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor
Grant 4,428,843 - Cowan , et al. * January 31, 1 | 1984-01-31 |
Organophilic polyphenolic acid additives for well-working compositions
Grant 4,421,655 - Cowan December 20, 1 | 1983-12-20 |
Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor
Grant 4,404,107 - Cowan , et al. * September 13, 1 | 1983-09-13 |
Method of enhancing the effect of liquid organic lubricants in drilling fluids
Grant 4,356,096 - Cowan , et al. October 26, 1 | 1982-10-26 |
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