Multi-layer magnetic tag
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United States of America Patent
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Mar 20, 2001
Grant Date -
N/A
app pub date -
May 21, 1999
filing date -
Sep 27, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic marker or tag is disclosed which comprises (a) a first magnetic material characterised by high permeability, low coercivity and a non-linear B-H characteristic; and (b) a second magnetic material which is capable of being permanently magnetised, said first and second magnetic materials being superimposed one on the other and advantageously being substantially coterminous. The second magnetic material is preferably of medium coercivity. Selected regions of said second magnetic material can carry magnetisation such as to magnetically divide the first magnetic material into a series of magnetically discrete zones, the length of said magnetically discrete zones and/or the lengths of said magnetised regions ('gaps') of said second material constituting elements of a code.
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