Mobile perimeter monitoring system
US5086290A · kind A · utility
Inventors
Key dates
| Filing date | Mar 8, 1990 |
| Grant date | Feb 4, 1992 |
| Priority date | — |
| Expiry date | Mar 8, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/24
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A mobile perimeter monitoring system includes a battery powder transmitter adapted to be placed upon the person to be monitored while the system user carries a receiver. The receiver responds to a code transmitted by the transmitter and provides an in-range or out-of-range indication depending upon whether the receiver is within the effective range of the transmitter or outside of its effective range. An adjustment on the receiver allows the user to adjust the effective range of the system for varying environments. The receiver may be operated in an in-range mode or an out-of-range mode to provide both perimeter monitoring capability and the ability to track a transmitter if its moves outside the perimeter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.