Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4536300 | Micellar solution for recovering crude oil | Robert F. Purcell | 1985-08-20 |
| 4522732 | Process for recovering petroleum from a geological formation | Robert F. Purcell | 1985-06-11 |
| 4485021 | Water flooding process for recovering petroleum | Robert F. Purcell | 1984-11-27 |