Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5610582 | Alarm screen with built-in battery operated sounding unit | Richard Zahn | 1997-03-11 |
| 4839632 | Intrusion alarm screen assembly | Richard Zahn | 1989-06-13 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5610582 | Alarm screen with built-in battery operated sounding unit | Richard Zahn | 1997-03-11 |
| 4839632 | Intrusion alarm screen assembly | Richard Zahn | 1989-06-13 |