Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887290 | Cellular alarm backup system | Dennis B. Dop, Michael Freitag | 1989-12-12 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887290 | Cellular alarm backup system | Dennis B. Dop, Michael Freitag | 1989-12-12 |