Magnetic tags or markers
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United States of America Patent
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Apr 16, 2002
Grant Date -
N/A
app pub date -
Oct 9, 1998
filing date -
Jul 17, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic tag or marker is described which is capable of functioning as a multi-bit information carrying tag. The tag may be attached to an article and then used as a means of identifying that article, generally as it enters or is positioned within an interrogation zone. The tag comprises (a) a first magnetic material characterized by high permeability, low coercivity and a non-linear B-H characteristic; and (b) a second magnetic material which is capable of being permanently magnetized, the second magnetic material being magnetized with a non-uniform field pattern (A, B, C). Detection systems for use with such tags, and write/read system using them, are also disclosed.
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