Integrated hybrid electronic article surveillance marker
US6373387B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2000 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Aug 8, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2448
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An integrated deactivatable hybrid marker is disclosed which can be used both in radio frequency and magnetic harmonic article surveillance systems. The harmonics generating element or elements of the marker are inserted into a RF resonant circuit as an active part of the circuit. The deactivation of the marker is accomplished by employing another element of high coercivity magnetic material. When placed in a RF interrogation field, the hybrid marker causes an increase in absorption of transmitted signal in order to reduce the signal in the receiving coil of the RF surveillance system. When placed in an interrogation zone of a magnetic harmonic article surveillance system, the marker generates high harmonics of the interrogating frequency that can be detected by the receiver of the surveillance system. In addition both the RF and harmonic functions of the hybrid marker can be deactivated by a single process. Furthermore, the use of conductive paste material to print the RF circuits is disclosed to achieve a low cost manufacturing process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.