Magnetic markers
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United States of America Patent
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Apr 25, 2000
Grant Date -
N/A
app pub date -
Sep 24, 1997
filing date -
Sep 24, 1996
priority date (Note) -
Expired
status (Latency Note)
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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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