Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4821803 | High salinity polymer drive for surfactant flooding systems | — | 1989-04-18 |
| 4822501 | Use of lignin/amine/surfactant blends in enhanced oil recovery | Larry D. Pedersen, Lawrence E. Whittington | 1989-04-18 |