Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6416435 | Belt tensioner | Zdravko Dobrasevic, John P. Matterazzo | 2002-07-09 |
| 5651336 | Variable valve timing and lift mechanism | Ronald Michael Rygiel | 1997-07-29 |
| 5590627 | Fluid inletting and support structure for a variable valve assembly | Ronald Michael Rygiel | 1997-01-07 |