Collector type article surveillance marker with continuous keepe

Details Collector type article surveillance marker with continuous keepe Collector type article surveillance marker with continuous keepe

1993-05-27

1995-07-11

Peng, John K.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1314

Patent

active

054324998

ABSTRACT:
A dual-status marker for use in electronic article surveillance systems having an alternating magnetic field within an interrogation zone. The marker comprises a piece of a high permeability, low coercive force magnetic material substantially coextensive with a piece of remanently magnetizable material. The first piece is rectangular and exhibits lengthwise sections at which the material is removed, thus leaving narrow width regions forming switching sections, portions adjacent each end forming flux collectors. The marker is desensitized by uniformly magnetizing the piece of remanently magnetizable material.

REFERENCES:
patent: 3665449 (1972-05-01), Elder et al.
patent: 3747086 (1973-07-01), Peterson
patent: 4120704 (1978-10-01), Anderson
patent: 4689590 (1987-08-01), Heltemes
patent: 4710754 (1987-12-01), Montean
patent: 4746908 (1988-05-01), Montean
patent: 4825197 (1989-04-01), Church et al.
patent: 4884063 (1989-11-01), Church et al.
patent: 4967185 (1990-10-01), Montean

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