Personal security system with alarm location tracking
US6342834B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1996 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Feb 1, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/001
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A personal security system locates emergency transmissions and tracks changes in location between successive transmissions. The transmissions are repeated automatically over a predetermined time interval exceeding five minutes. A plurality of fixed receivers are provided in predetermined positions in a protected region for detecting the emergency transmissions and a central monitoring station locates the transmissions from information provided by the detecting receivers. The monitoring station tracks successive transmissions and displays multiple locations as icons on a monitor. The icons vary in size based on relative transmission time and are stacked so any overlapping icons representing more recent transmissions are on top.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.