Magnetic materials for security applications
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United States of America Patent
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Dec 10, 1996
Issued Date -
N/A
app pub date -
Sep 12, 1994
filing date -
Jan 9, 1989
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A tag or marker is disclosed which comprises a substrate; an `active` magnetic material which is a soft magnetic material having a high magnetic permeability and a low coercive force; and a deactivating material which is a hard or semi-hard magnetic material having a moderate or high coercive force and a moderate magnetic permeability, whereby the deactivating material, when subjected to a sufficiently high magnetising force, is able to clamp the magnetic properties of the `active` material so as to deactivate the `active` material. The deactivating material in the tag or marker is electrodeposited nickel with a planar crystal grain structure.
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