Dual-status, magnetically imagable article surveillance marker
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United States of America Patent
Stats
-
May 24, 1988
Grant Date -
N/A
app pub date -
Sep 19, 1986
filing date -
Sep 19, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual status magnetic marker for use in electronic article surveillance systems, in which a piece of low coercive force, high permeability material is positioned adjacent to a piece of remanently magnetizable material. The first piece is configured such that no characteristic response is produced when the magnetization of the entire piece is reversed by an alternating magnetic field in an interrogation zone, and when the second piece is magnetized with a predetermined pattern a localized field is provided which biases portions of the first piece, keeping those portions from reversing when the marker is in the interrogation field. The predetermined pattern is such that the remaining, unbiased portion of the first piece has a configuration capable of producing a characteristic response when the magnetization in that portion is reversed.
First Claim
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International Classification(s)
Cited Art Landscape
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