Marker for use in a magnetic anti-theft security system and method for making same
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United States of America Patent
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Dec 26, 2000
Grant Date -
N/A
app pub date -
May 17, 1999
filing date -
Sep 17, 1997
priority date (Note) -
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Abstract
A marker for employment in a magnetic anti-theft security system is composed of an oblong alarm strip of an amorphous ferromagnetic alloy and at least one activation strip applied onto the alarm strip and composed of a semi-hard magnetic alloy. One or more spatially separated regions that are composed of a non-magnetic phase are introduced into the activation strip with a thermal treatment. The semi-hard magnetic alloy has a coercive force H.sub.c of 15 through 100 A/cm and a remanence B.sub.r of at least 0.8 T.
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