Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5705988 | Photoelectric smoke detector with count based A/D and D/A converter | — | 1998-01-06 |
| 5552770 | Glass break detection using multiple frequency ranges | — | 1996-09-03 |
| 5450061 | Glass break detection using temporal sequence of selected frequency characteristics | — | 1995-09-12 |
| 5438317 | Glass break detection with noise riding feature | — | 1995-08-01 |
| 4963749 | Quad element intrusion detection | — | 1990-10-16 |
| 4876445 | Intrusion detection device with extended field of view | — | 1989-10-24 |
| 4660024 | Dual technology intruder detection system | — | 1987-04-21 |