Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4471097 | Water soluble copolymers containing vinyl imidazole as drilling fluid additives | Klaus-Martin Uhl, Friedrich Engelhardt, Arvind D. Patel | 1984-09-11 |
| 4201679 | Drilling fluid additive | Larry D. Barker | 1980-05-06 |