Apparatus and method for protecting a magnetic layer on photosen

Details Apparatus and method for protecting a magnetic layer on photosen Apparatus and method for protecting a magnetic layer on photosen

1996-01-25

1998-02-03

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

206409, 242348, 242601, 242610, 340551, G08B 13187, B65D 55676, B65H 7518, G11B 23107

Patent

active

057149364

ABSTRACT:
A cartridge for protecting a magnetic layer on a photosensitive web material from a magnetic field. The cartridge comprises a ferromagnetic material dispersed in a polymer, the composite material of the polymer and the ferromagnetic material having a magnetic permeability greater than 1.0. The magnetic layer is shielded from a magnetic field applied externally of the cartridge, such as from an article surveillance system, which could affect recorded information on the magnetic layer.

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Source Tagging Summary Chart, 2 pages.
"Physics of Magnetism", pp. 281-285. Authors: S. Chikzumi and S.H. Charap.

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