Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4819723 | Reducing the permeability of a rock formation | Donald L. Whitfill, Jerry D. Purkaple | 1989-04-11 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4819723 | Reducing the permeability of a rock formation | Donald L. Whitfill, Jerry D. Purkaple | 1989-04-11 |