Apparatus for the surveillance of an electronic security element in an interrogation zone
US5894270A · kind A · utility
3Cited by
14References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1997 |
| Grant date | Apr 13, 1999 |
| Priority date | — |
| Expiry date | Sep 30, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2474
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention relates to an apparatus for the surveillance of an electronic security element in an interrogation zone, comprising a transmitting device emitting at least one cyclic interrogation signal into the interrogation zone, with the interrogation signal causing the security element to deliver a characteristic signal, a receiving device receiving the characteristic signal, and a computing/control unit evaluating the signals received from the receive device and producing an alarm when the presence of the security element is established.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.