Emergency alarm method and system utilizing cross cueing and ranging techniques
US4746912A · kind A · utility
7Cited by
2References
12Claims
0Family size
Inventors
Key dates
| Filing date | Aug 30, 1985 |
| Grant date | May 24, 1988 |
| Priority date | — |
| Expiry date | Aug 30, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/016
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An alarm signalling method and system utilizing cross cueing between radio, audio and visible alarm signals which are emitted by an alarm signalling unit. A method and system for measuring the range between the alarm signalling unit and a receiver carried by a rescuer wherein the differences in the time of receipt at the receiver of simultaneously emitted radio and audio signals is used as a measure of range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.