Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5146147 | AC motor drive system | Frank E. Wills, Harold Robert Schnetzka | 1992-09-08 |
| 5136216 | AC motor drive system | Frank E. Wills, Harold Robert Schnetzka | 1992-08-04 |
| 4798998 | Electronically dimmed power limited lighting system | J. Marshall Hemphill | 1989-01-17 |
| 4697122 | Slow acting photo lamp control | — | 1987-09-29 |