Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5406254 | Alarm system with remote module and associated alarm | William R. Vogt, Donald L. Hadden | 1995-04-11 |
| RE32468 | Central station alarm | Donald L. Hadden, George S. Beckwith | 1987-08-04 |
| 4228424 | Central station alarm | Donald L. Hadden, George S. Beckwith | 1980-10-14 |