Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9206964 | Convertible lighting fixture for multiple light sources | Joe R. Marsh, David Packard, William E. Nagengast, Judy Nagengast | 2015-12-08 |
| 8950907 | Convertible lighting fixture for multiple light sources | David Packard, William E. Nagengast, Judy Nagengast | 2015-02-10 |
| 5003446 | Composite headlamp vent device | William E. Nagengast, David R. McMahan | 1991-03-26 |