Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7461583 | Variable tension ring mechanism | Jack Lewis, David R. Stamy | 2008-12-09 |
| 6484622 | Variable oil ring tension mechanism | David R. Stamy | 2002-11-26 |
| 6435170 | Crankcase bypass system with oil scavenging device | Stephen H. Hill | 2002-08-20 |
| 6186110 | Piston skirt oil seal | Daniel John Pelham Wilkinson | 2001-02-13 |
| 6161468 | Four-piece oil seal | — | 2000-12-19 |