Multiple magnet assembly for use with electromagnetic article su

Details Multiple magnet assembly for use with electromagnetic article su Multiple magnet assembly for use with electromagnetic article su

1990-02-15

1993-02-16

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

For magnetizing or demagnetizing

335306, 340572, H01F 1300

Patent

active

051874628

ABSTRACT:
A multiple magnet assembly for magnetizing a magnetizable element of a desensitizable electromagnetic article surveillance marker, in which each successive assembly provides at a working surface a magnetic field of the same polarity but decreasing intensity. Any demagnetization effect attributable to reverse or back fields associated with one assembly are overcome by magnetization produced by a subsequent assembly, thus allowing markers having magnetizable elements with significantly different coercivee forces to be magnetized by the same apparatus.

REFERENCES:
patent: 3609611 (1971-09-01), Parnell
patent: 4684930 (1987-08-01), Minasy et al.
patent: 4689590 (1987-08-01), Heltemes
patent: 4752758 (1988-06-01), Heltemes
patent: 4968972 (1990-11-01), Canipe

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