Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4300635 | Aqueous petroleum sulfonate mixture and method of use in post-primary oil recovery | — | 1981-11-17 |
| 4274488 | Cosurfactant in preflush for surfactant flood system | James H. Hedges | 1981-06-23 |
| 4265308 | Oil recovery method using unique salinity for oil recovery surfactant system | James H. Hedges | 1981-05-05 |
| 4258789 | Cosurfactant blends for oil recovery surfactant system | James H. Hedges | 1981-03-31 |