Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4778586 | Viscosity reduction processing at elevated pressure | Richard L. Bain, John R. Larson, Dennis D. Gertenbach, Joseph J. Leto | 1988-10-18 |
| 4648964 | Separation of hydrocarbons from tar sands froth | Joseph J. Leto, Dennis D. Gertenbach | 1987-03-10 |