Remote-control lock system
US4686529A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Jan 6, 1984 |
| Grant date | Aug 11, 1987 |
| Priority date | — |
| Expiry date | Jan 6, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2209/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A remote-control lock system has a transmitter that can emit any of a set formed of a multiplicity of differently coded signals, a receiver that can be set to respond to any of the signals, and a lock operable by the receiver when it receives a signal it is set to. The set of signals the transmitter can emit includes a subset formed by a succession of different main signals and another subset formed by a succession of different synchronization signals. The transmitter is initially set to emit on normal actuation a predetermined one of the main signals and on special actuation a predetermined one of the synchronization signals and the receiver is set to respond only to the predetermined one main signal and to the predetermined synchronization signal to operate the lock. Thereafter on normal actuation of the transmitter, after each emission by the transmitter and reception by the receiver of the main signal they are both set to, the transmitter and receiver are both reset to the next of the main signals in the succession. On special actuation of the transmitter, after each emission by the transmitter and reception by the receiver of the synchronization signal they are both set to and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.