Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5351170 | Vehicle headlamp assembly | William E. Nagengast, David R. McMahan, Jan A. Wisler, Michael W. Ballentine | 1994-09-27 |
| 5063480 | Vehicle headlamp adjustment device | David R. McMahan, William E. Magengast | 1991-11-05 |
| 4807094 | Headlamp assembly | Lawrence M. Rice | 1989-02-21 |