Audible tag for magnetic electronic article surveillance systems
US5012224A · kind A · utility
12Cited by
7References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1990 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | Aug 3, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2431
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A tag for use in a magnetic article surveillance system employs an antenna means responsive to a transmitted magnetic signal and a piezoelectric means responsive to the antenna means for generating an audible acoustic signal. Embodiments are provided responding to unmodulated, amplitude modulated, and frequency modulated magnetic signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.