Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4568449 | Hydrotreating catalyst and process | Howard D. Simpson, Ryden L. Richardson | 1986-02-04 |
| 4540483 | Hydrotreating process | Howard D. Simpson, Ryden L. Richardson | 1985-09-10 |
| 4513097 | Hydrotreating catalyst and a method for preparing the catalyst | Howard D. Simpson, Ryden L. Richardson | 1985-04-23 |