Multi-layer thin-film EAS marker
US5083112A · kind A · utility
50Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1990 |
| Grant date | Jan 21, 1992 |
| Priority date | — |
| Expiry date | Jun 1, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A marker for use in magnetic-type electronic article surveillance systems, comprising a substrate on which are deposited a plurality of high permeability, low coercive force magnetic thin-films, each being separated from an adjacent magnetic thin-film by a non-magnetic thin-film. Each of the magnetic films have substantially the same permeability and coercive force, and the non-magnetic films are of a thickness to allow magnetostatic coupling while inhibiting exchange coupling. Accordingly, all of the magnetic thin-films reverse as a single entity and produce a sharp, readily distinguishable response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.