Magnetic recording

Details Magnetic recording Magnetic recording

1975-10-15

1977-05-10

Cook, Daryl W.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

235 6112M, 360 2, G11B 502, G06K 1906, G11B 2504

Patent

active

040232042

ABSTRACT:
Magnetic record media including permanent structures of aligned acicular particles have been proposed as a means of identifying and authenticating a medium. A method of recording and reading out information on such media without interference from the permanent structure remanence variation is described. Suitable forms of magnetic record media and their manufacture are described. The use of the media and method for security documents such as credit cards is also described.

REFERENCES:
patent: 3571799 (1971-03-01), Coker, Jr. et al.
patent: 3743134 (1973-07-01), Constable et al.
patent: 3873975 (1975-03-01), Miklos et al.
patent: 3878367 (1975-04-01), Fayling et al.

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