Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4940533 | Hydroprocessing hydrocarbon oils | Howard D. Simpson | 1990-07-10 |
| 4879265 | Hydroprocessing catalyst and phosphorous and citric acid containing impregnating solution | Howard D. Simpson | 1989-11-07 |