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US 5,401,584 AGranted
Surveillance marker and method of making same
AssigneeKnogo Corporation
InventorsArthur J. Minasy, Peter Y. Zhou, Thomas P. Solaski, Edward J. Callaghan
Life of this patent
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Abstract
A deactivatable electronic theft detection marker is made from a strip or ribbon of high magnetic permeability strip or ribbon and then high magnetic coercivity material is deposited on the strip or ribbon by electroplating.
Claims7
A deactivatable electronic article surveillance system marker comprising:
- an element of easily magnetizable material having high magnetic permeability and low magnetic coercivity such that said material, when subjected to continuous alternating magnetic interrogation fields, will produce characteristic detectable disturbances of those fields;
- and
- another magnetizable material which has a higher magnetic coercivity than the material of said element, said another magnetizable material being in direct contact with said element on an atom by atom basis, the interface between said magnetic materials being essentially free of any other materials.
Dependencies are inferred from the claim text.