Magnetic asymmetric antipilferage marker

Details Magnetic asymmetric antipilferage marker Magnetic asymmetric antipilferage marker

1976-07-15

1978-02-21

Swann, III, Glen R.

Communications: electrical

Systems

Call station

324262, 360132, 340258R, G08B 1322

Patent

active

040756181

ABSTRACT:
A widely accepted type of antipilferage system provides in an interrogation zone a magnetic field which periodically alternates at a predetermined frequency. Such systems further include means for detecting very high order harmonics of the predetermined frequency such as result from the presence within the zone of a marker having non-linear electrical or magnetic properties. In the present invention, such a marker includes an asymmetrically shaped piece or pieces of low-coercive force ferromagnetic material, including a center section and flux concentrator sections at opposite ends of the center section. Such a marker enables the protection of objects having a maximum dimension which is less than the length of prior art "open-strip" markers.

REFERENCES:
patent: 3747086 (1973-07-01), Peterson
patent: 3820104 (1974-06-01), Fearon
patent: 4000488 (1976-12-01), Ephraim

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