Magnetic recording medium and method for manufacturing the same

Details Magnetic recording medium and method for manufacturing the same Magnetic recording medium and method for manufacturing the same

1994-12-15

1997-07-01

Resan, Stevan A.

Stock material or miscellaneous articles

Composite

Of inorganic material

427128, 427130, 427548, 428900, 360134, G11B 5716

Patent

active

056436866

ABSTRACT:
A fixed permanent pattern is used for identifying a magnetic recording medium and a high security against forgery or modification is obtained by a magnetic recording medium including a non-magnetic support and at least two magnetic layers formed on said support, characterized in that at least one of said at least two magnetic layers contains magnetic particles having a coercive force of 4,000 Oe or less dispersed in a binder and has a non-rewritable fixed signal which has been recorded by magnetic field generated by a signal recorded on one or more other magnetic layers under the influence of an orientation magnetic field.

REFERENCES:
patent: 4239959 (1980-12-01), Gutterman
patent: 4242400 (1980-12-01), Smith et al.
patent: 4244998 (1981-01-01), Smith
patent: 4743490 (1988-05-01), Fayling
patent: 4977040 (1990-12-01), Yano et al.
patent: 4982302 (1991-01-01), Kitamoto et al.
patent: 5264292 (1993-11-01), Kovacs et al.

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