Magnetic card

Details Magnetic card Magnetic card

1988-06-29

1990-12-11

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of inorganic material

283 82, 283 94, 360131, 428694, 428900, G11B 2300

Patent

active

049770403

ABSTRACT:
In the subject magnetic card, first magnetic recording layer 2 is laid over substrate 1. First magnetic recording layer 2 has a coercive force that enables magnetic recording of data. Second magnetic recording layer 4, having a coercive force smaller than that of first magnetic recording layer 2, is laid over first magnetic recording layer 2, with shielding intermediate layer 3 interposed therebetween. Magnetic shielding layer 5 is provided as an uppermost magnetic layer.

REFERENCES:
patent: 2643130 (1953-06-01), Kornei
patent: 3219353 (1965-11-01), Prentky
patent: 3256483 (1966-06-01), Broadbent
patent: 3808404 (1974-04-01), Riggs
patent: 4410583 (1983-10-01), Hanaoka
patent: 4544574 (1985-10-01), Itami et al.
patent: 4555444 (1985-11-01), Hanaoka
patent: 4624883 (1986-11-01), Yamaguchi et al.
patent: 4624894 (1986-11-01), Kishimoto
patent: 4687231 (1987-08-01), Hartmann

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