Magnetic markers

Details Magnetic markers Magnetic markers

1997-09-24

2000-04-25

Hofsass, Jeffrey A.

Communications: electrical

Condition responsive indicating system

Specific condition

3605723, 360551, G08B 1314

Patent

active

060549246

ABSTRACT:
An improved EAS tag is disclosed. The tag is characterised in that the or one of the magnetic materials on the tag is divided into distinct zones such that the zones and their relative positions can represent information or a code which is readable magnetically by passing the tag through a magnetic field which comprises a relatively small region of zero magnetic field (a magnetic null) contiguous with regions where the magnetic field is sufficient to saturate said magnetic material, the tag being moved through the magnetic field and its magnetic response being detected as it traverses the magnetic null.

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patent: 5847650 (1998-12-01), Zhou et al.

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