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| Number | Title | Issue Date |
| 4910464 | Proximity detector A movable door incorporates a proximity detection system for sensing obstructions in the path of the door. The system comprises an array of transmitter/receiver pairs (21, 22 and 23), each pair comprising a transmitter (1) for transmitting an energy pulse... | 03/20/1990 |
| 4894952 | Proximity detector A movable door incorporates a proximity detection system for sensing obstructions in the path of the door. The system comprises an array of transmitter/receiver pairs, each pair comprising a transmitter for tranmitting an energy pulse, a receiver located ... | 01/23/1990 |
| 4864296 | System for synchronizing signals on a two-wire line A system for synchronizing pulse signals transmitted between two stations using only two conductor lines includes a synchronization circuit. The circuit includes two modulators and two EXCLUSIVE-OR gates for controlling when data pulses are transmitted an... | 09/05/1989 |
| 4839605 | Signal compensation circuits A detection system for a sliding lift or elevator door comprises at least two sensors for monitoring the door opening. The sensors are arranged to detect the presence of a moving irregular shape (e.g. human form) in the doorway to reverse the opening acti... | 06/13/1989 |
