Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4413856 | Hardbar energy absorbing bumper system for vehicles | David R. McMahan, Gary P. Zeller, Martin D. Skirha, Dean M. Bayer | 1983-11-08 |
| 4387920 | Cellular energy absorbing bumper and lamp assembly mounted thereto | David Carpenter | 1983-06-14 |