Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5114599 | Use of lignin/amine/surfactant blends in enhanced oil recovery | Larry D. Pedersen, Lawrence E. Whittington | 1992-05-19 |
| 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 |
| 4787454 | Recovering hydrocarbons with surfactants from lignin | Douglas G. Naae, Lawrence E. Whittington, Will A. Ledoux | 1988-11-29 |
| 4781251 | Recovering hydrocarbons with water soluble alkylphenol lignin surfactants | Douglas G. Naae | 1988-11-01 |
| 4756370 | Lignin amine surfactant system followed by sequential polymer slugs | — | 1988-07-12 |
| 4739040 | Surfactants from lignin | Douglas G. Naae, Lawrence E. Whittington, Will A. Ledoux | 1988-04-19 |
| 4611659 | Oxidized alkali lignins and their use in enhanced oil recovery | Larry D. Pedersen, David K. Olsen, William C. Richardson | 1986-09-16 |
| 4548721 | Method of enhanced oil recovery and compositions useful therein | Lawrence E. Whittington, Larry D. Pedersen | 1985-10-22 |