Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5203306 | Fuel feed system | Henry C. Billingsley, David J. Hartke | 1993-04-20 |
| 5035211 | Internal combustion engine | David W. Mate, Duane E. Rogers, Henry C. Billingsley, George Broughton | 1991-07-30 |
| 5022355 | Internal combustion engine | Henry C. Billingsley | 1991-06-11 |
| 4800856 | Abrasion resistant roller apparatus for internal combustion engines | Gene F. Baltz | 1989-01-31 |