Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5625257 | Emergency vehicle light switching and controlling circuit | — | 1997-04-29 |
| 5612673 | Emergency vehicle siren circuit system | — | 1997-03-18 |
| 4980837 | Circuit and method for automatically sweeping through a plurality of siren modes | Francis H. Gerhard | 1990-12-25 |