Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4778586 | Viscosity reduction processing at elevated pressure | Richard L. Bain, John R. Larson, Dennis D. Gertenbach, Daniel W. Gillespie | 1988-10-18 |
| 4648964 | Separation of hydrocarbons from tar sands froth | Dennis D. Gertenbach, Daniel W. Gillespie | 1987-03-10 |