Remote infra-red personal alarm system
US5003294A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 1989 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Jul 20, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/14
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An infra-red remote personal alarm system consists of a portable transmitter unit (10) which is intended to be worn or to be manually carried by the user, and which is operable by the user at any particular location to transmit an alarm signal in an emergency and which is to be received by a central receiving station (41) so that appropriate action can be initiated in response thereto. The transmitter unit is electrically operable and includes means (15) for transmitting pulsed infra-red alarm signals which can be picked-up by an infra-red signal receiver at the location of the user, and then retransmitted as an oscillating electrical signal via direct wiring (38, 39, 40, 42, 43) to the central receiving station (41) as a warning signal indicative at location monitoring points (43, 44) of the location from which the emergency call has been made. By making the transmitter units capable of transmitting infra-red pulsed warning signals, and suitably designing the receiver units to recognize and to receive the pulse signals for conversion into electrical signals for onward transmission to the central control station, it is possible to obtain transmission units which are robust and reli…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.