Issued Patents All Time
Showing 51–74 of 74 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5888944 | Oil-based drilling fluid | — | 1999-03-30 |
| 5869433 | Non-fluorescing oil-based drilling fluid | — | 1999-02-09 |
| 5789349 | Water-based drilling fluids with high temperature fluid loss control additive | — | 1998-08-04 |
| 5712228 | Silicone based fluids for drilling applications | — | 1998-01-27 |
| 5707939 | Silicone oil-based drilling fluids | — | 1998-01-13 |
| 5639715 | Aqueous based drilling fluid additive and composition | — | 1997-06-17 |
| 5635458 | Water-based drilling fluids for reduction of water adsorption and hydration of argillaceous rocks | Li-Jein Lee | 1997-06-03 |
| H1611 | Glycols as internal phase in oil well drilling fluids | — | 1996-11-05 |
| 5424284 | Drilling fluid additive and method for inhibiting hydration | Henry C. McLaurine | 1995-06-13 |
| 5350740 | Drilling fluid additive and method for inhibiting hydration | Henry C. McLaurine | 1994-09-27 |
| 5189012 | Oil based synthetic hydrocarbon drilling fluid | Raymond E. McGlothlin, Roger D. Bleier, H. N. Brinkley | 1993-02-23 |
| 5149690 | Drilling fluid additive and method for inhibiting hydration | Henry C. McLaurine | 1992-09-22 |
| 5134118 | Aqueous based drilling fluid | Henry C. McLaurine | 1992-07-28 |
| H1000 | Water based synthetic hydrocarbon drilling fluid and spotting fluid | Raymond E. McGlothlin | 1991-12-03 |
| 4740319 | Oil base drilling fluid composition | Carmelita Salandanan | 1988-04-26 |
| 4713183 | Oil based drilling fluid reversion | Carmelita Salandanan | 1987-12-15 |
| 4710586 | Fluid loss additives for oil base muds and low fluid loss compositions thereof | Carmelita Salandanan | 1987-12-01 |
| 4637883 | Fluid loss additives for oil base muds and low fluid loss compositions thereof | Carmelita Salandanan | 1987-01-20 |
| 4595736 | Thermally stable drilling fluid additive comprised of a copolymer of catechol-based monomer | — | 1986-06-17 |
| 4579927 | Copolymers of flavanoid tannins and acrylic monomers | Thomas E. Sample, Jr. | 1986-04-01 |
| 4544756 | Zwiterionic 2-alkyl imidazolines as emulsifying agents for oil based drilling fluids | — | 1985-10-01 |
| 4525562 | Thermally stable drilling fluid additive | — | 1985-06-25 |
| 4521578 | Composition and method of preparation of novel aqueous drilling fluid additives | Robert G. Chen, Thomas E. Sample, Jr. | 1985-06-04 |
| 4471097 | Water soluble copolymers containing vinyl imidazole as drilling fluid additives | Klaus-Martin Uhl, James K. Bannerman, Friedrich Engelhardt | 1984-09-11 |