Magnetic recording

Details Magnetic recording Magnetic recording

1975-10-15

1978-09-12

Cook, Daryl W.

Registers

Coded record sensors

Particular sensor structure

235493, 360 2, G06K 708, G06K 1906, G11B 2504

Patent

active

041140290

ABSTRACT:
Magnetic recording media including permanent structures of aligned acicular particles have been proposed as a means of identifying and authenticating a medium. A structure of such a media by which information can be recorded and read-out without interference from the structural remanence difference is described. An apparatus and method for the examination of such media for their permanent structures, particularly when used in security documents such as credit cards, are also described.

REFERENCES:
patent: 3566356 (1971-02-01), Holm et al.
patent: 3571799 (1971-03-01), Coker, Jr. et al.
patent: 3634797 (1972-01-01), Burkholter
patent: 3743134 (1973-07-01), Constable et al.
patent: 3790754 (1974-02-01), Black et al.
patent: 3873975 (1975-03-01), Miklos et al.
patent: 3878367 (1975-04-01), Fayling et al.

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