Communications: electrical – Systems – Call station
Patent
1974-02-20
1976-02-10
Trafton, David L.
Communications: electrical
Systems
Call station
29197, 29199, 324 41, 340258R, 343 65SS, G08B 1324
Patent
active
039381250
ABSTRACT:
An antipilferage system utilizing markers comprising a sheet having both ferromagnetic and electrically conductive characteristics, which markers are detected upon passage through an interrogation zone within which are sequentially generated magnetic fields orthogonally disposed with respect to each other. The marker sheet is preferably a laminate of a ferromagnetic layer and a conductive metal layer, each of which layers exhibits a maximum sensitivity to fields perpendicular to each other. Interrogation of the markers by fields in three dimensions ensures the production of signal components associated with both characteristics of the marker regardless of the orientation of the marker upon passage through the zone. Accordingly, a highly reliable and false alarm free system is provided.
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patent: 3765007 (1973-10-01), Elder
patent: 3820104 (1974-06-01), Fearon
Minnesota Mining and Manufacturing Company
Trafton David L.
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