Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5420430 | Detection systems for detecting obstructions in doorways | — | 1995-05-30 |
| 5053616 | Photoelectric array detection circuitry with dual gating means | — | 1991-10-01 |
| 4976337 | Proximity detection systems | — | 1990-12-11 |
| 4910464 | Proximity detector | Peter F. Bradbeer | 1990-03-20 |
| 4894952 | Proximity detector | Peter F. Bradbeer | 1990-01-23 |
| 4864296 | System for synchronizing signals on a two-wire line | Peter F. Bradbeer | 1989-09-05 |
| 4839605 | Signal compensation circuits | Peter F. Bradbeer | 1989-06-13 |
| 4506765 | Proximity detector circuitry especially for lift doors | Reginald K. Payne | 1985-03-26 |
| 4427095 | Monitoring and controlling lift positions | Reginald K. Payne | 1984-01-24 |