Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6793222 | Oil scraper piston ring having circumferentially distributed recesses | Evangelos Katsaounis | 2004-09-21 |
| 6631908 | Compression piston ring | Richard Mittler | 2003-10-14 |