Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5937802 | Engine cooling system | Steven J. Bethel, Mark A. Ruman, Donald R. Kellermann | 1999-08-17 |
| 4864986 | Two-cycle engine with offset piston ovality | Steven J. Bethel | 1989-09-12 |
| 4838820 | Preassembled throttle cable linkage | James C. Boda, Bruce A. Heidel | 1989-06-13 |
| 4836151 | Two cycle engine with turbulence generator at reed valves | John J. Litjens, John M. Griffiths | 1989-06-06 |
| 4549507 | Two cycle loop scavenged engine with improved transfer passage flow | — | 1985-10-29 |