Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4333093 | Intrusion detection system | Irving L. Ellner | 1982-06-01 |
| 4287515 | Fire detection system with multiple output signals | John Wynne, Alan Heim | 1981-09-01 |
| 4227191 | Light emitting smoke detector | — | 1980-10-07 |