Multi-mode electronic article surveillance system
US5049857A · kind A · utility
28Cited by
4References
62Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1989 |
| Grant date | Sep 17, 1991 |
| Priority date | — |
| Expiry date | Jul 24, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2482
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A magnetic article surveillance system in which surveillance is carried out by operating the system in first and second different modes of a magnetic transmitting and receiver means in order to make a determination as to the presence of an article in the zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.