Article surveillance magnetic marker having an hysteresis loop with large barkhausen discontinuities at a low field threshold level
US5801630A · kind A · utility
24Cited by
10References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1996 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Nov 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/15391
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A harmonic-type EAS marker includes a wire segment formed of cobalt alloy. To form the wire segment, the cobalt alloy is cast as an amorphous wire, die-drawn to a smaller diameter, and then annealed with application of longitudinal tension. The annealed wire is cut to produce wire segments which have a magnetic hysteresis loop with a large Barkhausen discontinuity at a lower threshold level than has previously been achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.