Issued Patents All Time
Showing 1–25 of 48 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6780822 | Anhydride-modified chitosan, method of preparation thereof, and fluids containing same | Jack C. Cowan, Tammy L. Rodrigue | 2004-08-24 |
| 6656885 | Anhydride-modified chitosan, method of preparation thereof, and fluids containing same | Diane Smith | 2003-12-02 |
| 6422326 | Aphron-containing well drilling and servicing fluids of enhanced stability | Tommy F. Brookey | 2002-07-23 |
| 6358889 | Viscosified aqueous chitosan-containing well drilling and servicing fluids | John H. Waggenspack, Kimely P. Pitre | 2002-03-19 |
| 6291404 | Viscosified aqueous chitosan-containing well drilling and servicing fluids | — | 2001-09-18 |
| 6277792 | Viscosified aqueous fluids and viscosifier therefor | — | 2001-08-21 |
| 6258755 | Chitosan-containing well drilling and servicing fluids | Jack C. Cowan | 2001-07-10 |
| 6127319 | Oil-in-water emulsion | — | 2000-10-03 |
| 6123159 | Aphron-containing well drilling and servicing fluids of enhanced stability | Tommy F. Brookey | 2000-09-26 |
| 6014947 | Ground grain animal litter | James H. Sladek, S. Michael Hughes | 2000-01-18 |
| 5977030 | Method of increasing the LSRV of aqueous fluids and oil-in-water emulsions prepared thereby | — | 1999-11-02 |
| 5916849 | Polysaccharide-containing well drilling and servicing fluids | — | 1999-06-29 |
| 5230305 | Scoopable cat litter and method | — | 1993-07-27 |
| 5207830 | Lightweight particulate cementitious materials and process for producing same | Jack C. Cowan, Andree' H. Harrington | 1993-05-04 |
| 5188064 | Clumping cat litter | — | 1993-02-23 |
| 5147852 | Reduction of seepage losses in well working compositions | Jack C. Cowan, Andree H. Harrington | 1992-09-15 |
| 5076944 | Seepage loss reducing additive for well working compositions and uses thereof | Jack C. Cowan, Andree' H. Harrington | 1991-12-31 |
| 5071575 | Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor | Andree H. Harrington, Jack C. Cowan | 1991-12-10 |
| 5045593 | Organophilic modified polymers | Jack C. Cowan, Victor M. Granquist | 1991-09-03 |
| 5009798 | Low fluid loss heavy brines containing hydroxyethyl cellulose | Lonnie D. Hoover | 1991-04-23 |
| 5004553 | Well working compositions, method of decreasing the seepage loss from such compositions, and additive therefor | Andree H. Wilkinson, Jack C. Cowan | 1991-04-02 |
| 4960740 | Organophilic clay compositions | Victor M. Granquist, Jack C. Cowan | 1990-10-02 |
| 4956104 | Organophilic polymers | Jack C. Cowan, Victor M. Granquist | 1990-09-11 |
| 4925616 | Method of protecting a cased pipeline from corrosion | Ronald W. Brown | 1990-05-15 |
| 4863980 | Organophilic modified polymers | Jack C. Cowan, Victor M. Granquist | 1989-09-05 |