Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4425463 | Drilling fluids based on a mixture of sulfonated thermoplastic polymer and an amine-treated clay | Thad O. Walker, S. Richard Turner, Robert D. Lundberg, Warren A. Thaler | 1984-01-10 |