Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4741543 | Piston scraper ring | Robert Geffroy | 1988-05-03 |
| RE32395 | Piston and piston rings set | Robert Geffroy | 1987-04-14 |
| 4516481 | Piston and piston rings set | Robert Geffroy | 1985-05-14 |