Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847018 | Process for producing petroleum sulfonates | Jeffery W. Koepke, June M. Bostich | 1989-07-11 |
| 4836282 | Enhanced oil recovery method employing an aqueous polymer | — | 1989-06-06 |
| 4808648 | Enhanced oil recovery composition | — | 1989-02-28 |
| 4795772 | Enhanced oil recovery composition | — | 1989-01-03 |