Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4867499 | Louvered tailgate and airflow directing wing for pickup truck | Donald C. Stephan, Gary Yeomans, James R. Abney, Ben V. Domas | 1989-09-19 |
| 4613146 | Monocoque bicycle frame | Donald C. Stephan | 1986-09-23 |