Multi-bit EAS marker powered by interrogation signal in the eight MHz band
US5625341A · kind A · utility
73Cited by
19References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1995 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | Aug 31, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2431
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A multi-bit electronic article surveillance marker includes an antenna circuit and is powered by an interrogation field generated by EAS detection equipment and received by the marker's antenna circuit. The marker generates a multi-bit signal by selectively disturbing the interrogation field. The disturbances may be created by selectively short circuiting the marker's antenna circuit. All of the marker circuitry, including a coil that is part of the antenna circuit, may be provided as circuit elements formed on a semiconductor integrated circuit substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.