Method and apparatus for deactivating magnetic targets
First Claim
1. A method for deactivating randomly oriented elongated magnetic targets having elongated magnetizable slugs distributed along their length, said method comprising the steps of successively subjecting the slugs of each target to magnetic fields of successively reduced intensity which extend in different directions, each of said magnetic fields being of sufficient intensity to magnetize the slugs along a target sufficiently to deactivate the target when the direction of the field is substantially the same as that of the target.
5 Assignments
0 Petitions
Accused Products
Abstract
Articles of merchandise (42) which contain deactivatable theft detection targets (44) have their targets deactivated by passing them through a box-like apparatus (30) made of low coercive force, high saturation induction material with a multiplicity of permament magnets (48) on its inside surfaces so as to generate magnetic fields which extend at different directions and at decreasing intensities from one end of the apparatus to the other so that irrespective of a target'"'"'s orientation while passing through the apparatus, the target'"'"'s magnetic deactivation slugs or elements will encounter a magnetizing field along the target'"'"'s length sufficient to magnetize the elements.
53 Citations
11 Claims
- 1. A method for deactivating randomly oriented elongated magnetic targets having elongated magnetizable slugs distributed along their length, said method comprising the steps of successively subjecting the slugs of each target to magnetic fields of successively reduced intensity which extend in different directions, each of said magnetic fields being of sufficient intensity to magnetize the slugs along a target sufficiently to deactivate the target when the direction of the field is substantially the same as that of the target.
- 5. An apparatus for deactivating randomly oriented elongated magnetic targets having elongated magnetizable slugs distributed along their length, said apparatus comprising means for producing magnetic fields which extend in different directions and means for successively subjecting the slugs on each target to a different one of said fields, each of said magnetic fields being of sufficient intensity to magnetize the slugs along a target sufficiently to deactivate the target when the direction of the field is substantially the same as that of the target, said means for producing said magnetic fields being constructed and arranged to generate fields of successively reduced intensity along a given path.
Specification