Personal security system network
US5115224A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 5, 1991 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Jul 5, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/009
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A personal security system includes at least one movable transmitter adapted to produce an emergency signal transmission when activated and a plurality of transceivers adapted to receive emergency signal transmissions from the movable transmitter. The received strength of an emergency signal received by one of the transceivers is compared with the received signal strength of an emergency signal received by other of the transceivers, and an alarm signal is produced by a transceiver in response to receipt of a transmission whose signal strength is stronger than any other transmission signal strength to which it has been compared. The alarm signal may include a code identifying both the activated movable transmitter and the transceiver producing the alarm signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.