Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4643256 | Steam-foaming surfactant mixtures which are tolerant of divalent ions | Richard E. Dilgren | 1987-02-17 |
| 4601336 | Process for selecting a steam foam forming surfactant | Richard E. Dilgren | 1986-07-22 |
| 4562727 | Olefin sulfonate-improved steam foam drive | Richard E. Dilgren | 1986-01-07 |
| 4488976 | Olefin sulfonate-improved steam foam drive | Richard E. Dilgren | 1984-12-18 |
| 4393937 | Olefin sulfonate-improved steam foam drive | Richard E. Dilgren | 1983-07-19 |