Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872500 | Method of manufacturing a tool | Donald Duffey, Sellers Hardee, James Elliott, Robert K. Gardner, Claus Suess | 1989-10-10 |
| 4800077 | Guerbet quaternary compounds | A. J. O'Lenick, Jr. | 1989-01-24 |