Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4704213 | Encapsulated oil absorbent polymers as lost circulation additives for oil based drilling fluids | Clarence O. Walker | 1987-11-03 |
| 4633950 | Method for controlling lost circulation of drilling fluids with hydrocarbon absorbent polymers | Clarence O. Walker | 1987-01-06 |