Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879014 | Removal of organic acids from freshly produced bitumen | Richard H. Lea, Beverley Payne | 1989-11-07 |
| 4842056 | Process for metal plating cement in a perforated well | — | 1989-06-27 |
| 4821801 | Producing asphaltic crude oil | — | 1989-04-18 |