Tamper-proof bracelet for home arrest system
US5471197A · kind A · utility
40Cited by
27References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1993 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Feb 19, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B21/22
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A personnel monitoring apparatus has a transmitter for transmitting a data encoded signal. A strap is provided for coupling the transmitter to a person to be monitored. An emitter is attached to the transmitter for emitting an optical signal. A detector is attached to the transmitter for detecting the optical signal. An optical fiber is incorporated with the strap for optically coupling the emitter and the detector. A comparator compares the optical signal and a reference signal, and the result of the comparison sets the value of a preselected data bit in the data encoded signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.