Method and apparatus for deactivating magnetic targets

Details Method and apparatus for deactivating magnetic targets Method and apparatus for deactivating magnetic targets

1991-01-17

1992-06-30

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340551, G08B 1314

Patent

active

051267209

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.

REFERENCES:
patent: 3665449 (1972-05-01), Elder et al.
patent: 3765007 (1973-10-01), Elder
patent: 3780521 (1973-12-01), Kurita et al.
patent: 3820103 (1974-06-01), Fearon
patent: 3820104 (1974-06-01), Fearon
patent: 4623877 (1986-11-01), Buckens
patent: 4665387 (1987-05-01), Cooper et al.
patent: 4684930 (1987-08-01), Minasy et al.
patent: 4709179 (1987-11-01), Banon et al.
patent: 4752758 (1988-06-01), Heltemes

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