Multiple pulse responder and detection system and method of maki

Details Multiple pulse responder and detection system and method of maki Multiple pulse responder and detection system and method of maki

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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