Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799694 | Piston ring and method of making the same | — | 1989-01-24 |
| 4796898 | Oil scraper piston ring with elliptical oil vent holes | Martin Morsbach | 1989-01-10 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799694 | Piston ring and method of making the same | — | 1989-01-24 |
| 4796898 | Oil scraper piston ring with elliptical oil vent holes | Martin Morsbach | 1989-01-10 |