Responder target for theft detection apparatus

Details Responder target for theft detection apparatus Responder target for theft detection apparatus

1991-01-14

1993-01-26

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

15624418, 156269, 156303, 264145, 427128, B32B 1116

Patent

active

051820625

ABSTRACT:
A responder target for a magnetic detection system includes a signal element of high permeability low coercivity magnetic material such as permalloy or amorphous metal, and a control element of ferric oxide powder having the formula Fe.sub.3 O.sub.4 dispersed in a polymer binder. The ferric oxide powder having a coercivity H.sub.c in the range of 50-150 Oe and a particle size of 20-100 .mu.m, dispersed 20-35% by weight in the polymer binder. The ferric oxide powder in the binder is coated on a substrate to form a control element strip, laminated to the signal element, and chopped into lengths to form the responder target. Alternatively, the signal element strip is laminated to a support layer, and the ferric oxide is coated by extrusion over the signal element.

REFERENCES:
patent: 3765007 (1973-10-01), Elder
patent: 4163823 (1979-08-01), Legrns et al.
patent: 4222517 (1980-09-01), Richardson
patent: 4518627 (1985-05-01), Foley et al.
patent: 4536229 (1985-08-01), Jin et al.
patent: 4640790 (1987-02-01), Sylvester et al.
patent: 4778552 (1988-10-01), Benge et al.
patent: 4923711 (1990-05-01), Charnega et al.

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