Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856588 | Selective permeability reduction of oil-free zones of subterranean formations | — | 1989-08-15 |
| 4856589 | Gas flooding with dilute surfactant solutions | Myron I. Kuhlman, Andrew H. Falls | 1989-08-15 |
| 4852653 | Method to obtain rapid build-up of pressure in a steam foam process | — | 1989-08-01 |
| 4799547 | A CO.sub.2 drive process for oil recovery employing an alcohol ethoxycarboxylate surfactant | — | 1989-01-24 |