Coded surveillance marker with improved biasing

Details Coded surveillance marker with improved biasing Coded surveillance marker with improved biasing

1985-09-03

1988-03-01

Mancene, Gene

Card, picture, or sign exhibiting

Check, label, or tag

Permanent identification device

40 20R, 40 2R, G09F 302

Patent

active

047276681

ABSTRACT:
A surveillance marker is provided for utilization in antipilferage and anticounterfeiting systems. The marker includes a housing formed of barium ferrite impregnated plastic. Advantageously, the barium ferrite impregnated plastic housing provides a quasi-solenoidal dc magnetic bias field for activating one or more stacked ferromagnetic ribbons contained within the housing to produce an identifiable signal in response to an applied ac magnetic interrogation field.

REFERENCES:
patent: 3215150 (1966-05-01), Sedgwick
patent: 3680236 (1972-08-01), Deal et al.
patent: 4417413 (1983-11-01), Hoppe et al.
patent: 4512096 (1985-04-01), Heidecker

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