Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7753400 | Multi-axle leaf spring suspension with compliant equalizer | William Dunlap, James Tuthill | 2010-07-13 |
| 6708988 | Hangers for trailer heights adjustment | William Dunlap | 2004-03-23 |
| 4412690 | Suspension system | B. Robert Prokop | 1983-11-01 |