Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4923617 | Process for inhibiting scale formation | Gerald L. Shoemaker | 1990-05-08 |
| 4792412 | High temperature stable aqueous brine fluids viscosified by polyvinylpyrrolidone | — | 1988-12-20 |
| 4655942 | Controlled release dispersant for clay-thickened, water-based drilling fluids | Joseph J. Dickert, Jr. | 1987-04-07 |
| 4652375 | Process for selectively extracting dissolved salts from aqueous media | Tsoung Y. Yan | 1987-03-24 |
| 4626362 | Additive systems for control of fluid loss in aqueous drilling fluids at high temperatures | Joseph J. Dickert, Jr. | 1986-12-02 |
| 4619773 | High temperature stable aqueous brine fluids viscosified by water-soluble copolymers of acrylamidomethylpropanesulfonic acid salts | Dennis H. Hoskin | 1986-10-28 |
| 4609476 | High temperature stable aqueous brine fluids | — | 1986-09-02 |
| 4608182 | Vinyl sulfonate amide copolymer and terpolymer combinations for control of filtration in water-based drilling fluids at high temperature | Joseph J. Dickert, Jr. | 1986-08-26 |
| 4514310 | High temperature stable fluids for wellbore treatment containing non-aqueous solvents | — | 1985-04-30 |
| 4498994 | High temperature stable drilling fluids containing non-aqueous solvents | — | 1985-02-12 |
| 4490261 | Acidic high temperature stable aqueous brine fluids viscosified by basic N-heterocyclic polymers | — | 1984-12-25 |
| 4481120 | High temperature stable aqueous brine fluids viscosified by N-heterocyclic organophosphorus compounds | — | 1984-11-06 |
| 4381234 | Solvent extraction production of lube oil fractions | Costandi A. Audeh, James R. White, Tsoung Y. Yan | 1983-04-26 |
| 4273645 | Solvent extraction production of lube oil fractions | Costandi A. Audeh, James R. White, Tsoung Y. Yan | 1981-06-16 |