Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884634 | Process for increasing the degree of oil extraction | — | 1989-12-05 |
| 4869810 | Method of recovering evaporable liquids from mud comprising fine grained particles and the evaporable liquids | Jorgen Stabel | 1989-09-26 |