Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869806 | Production of high viscosity index lubricating oil stock | Thomas F. Degnan, Ernest W. Valyocsik | 1989-09-26 |
| 4812223 | Hydrocracking naphthas using mildly steamed, noble metal-containing zeolite beta | Karlton J. Hickey | 1989-03-14 |