Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5497298 | Headlamp assembly with coil spring bulb shield | Jan A. Wisler, Joseph C. Ballman, David Barnes | 1996-03-05 |
| 5497299 | Headlamp assembly with hook-in bulb shield | Jan A. Wisler, Duane E. Ormes, Randall J. Smith, Terry L. Coombs, Ernst K. Werner | 1996-03-05 |
| 5483425 | Quick release vehicle headlamp arrangement | Steven V. Horsman, Brian E. Witte | 1996-01-09 |
| 5428511 | Quick release vehicle headlamp arrangement | Steven V. Horsman, Jan A. Wisler, Brian E. Witte | 1995-06-27 |
| 5010455 | Headlamp assembly | William E. Nagengast, Robert G. Roeske | 1991-04-23 |
| 4974123 | Headlamp assembly | William E. Nagengast | 1990-11-27 |
| 4833572 | Headlamp ventilation system | William E. Nagengast | 1989-05-23 |