Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D317942 | Address display and alarm unit for alarm system | Marlene Fritz, Mary Sweeney | 1991-07-02 |
| 4855723 | Audio-visual alarm system with address display | Marlene Fritz, Mary Sweeney, Chuck Davis | 1989-08-08 |