Issued Patents All Time
Showing 26–32 of 32 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4921621 | Hydrolyzed co-polymers of N-vinylamide and acrylamide for use as waterloss control additives in drilling mud | Robert K. Pinschmidt, Jr., Ta-Wang Lai | 1990-05-01 |
| 4726906 | Polymers for use as filtration control aids in drilling muds | Shih-Ruey T. Chen, Gary F. Matz | 1988-02-23 |
| 4652623 | Polymers for use as filtration control aids in drilling muds | Shih-Ruey T. Chen, Gary F. Matz | 1987-03-24 |
| 4533708 | Polyampholyte polymer | — | 1985-08-06 |
| 4484631 | Use of polyampholytes to enhance oil and/or gas recovery | Nancy S. Sherwood, Gary F. Matz | 1984-11-27 |
| 4460477 | Use of a carboxylic functional polyampholyte to inhibit the precipitation and deposit of scale in aqueous systems | Gary F. Matz | 1984-07-17 |
| 4455240 | Ampholytic polymers for use as filtration control aids in drilling muds | — | 1984-06-19 |