Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4878370 | Cold extrusion process for internal helical gear teeth | William J. Fuhrman, Daniel W. Hall | 1989-11-07 |
| 4878677 | Shut off seal about a shaft of a device having a side entry into a tank | David Larkins | 1989-11-07 |
| 4834793 | Oxidation process for releasing metal values in which nitric acid is regenerated in situ | Gezinus Van Weert, Kenneth J. Fair | 1989-05-30 |