Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-12-04
1994-04-19
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
Specific condition
340505, 340526, 148108, G08B 1314
Patent
active
053049837
ABSTRACT:
A responder for electronic article surveillance apparatus is made by subjecting a plurality of magnetizable elements to heating in the presence of a magnetic field and maintaining the field at a different intensity for each element as it is cooled to provide different magnetic characteristics so that when the responder is subjected to a cyclically varying magnetic interrogation field its several elements produce spaced apart pulses in each cycle.
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Dunn John
Graham Charles D.
Shin Kyung-Ho
Zhou Peter Y.
Knogo Corporation
Mullen Thomas
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