Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data verification
Patent
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.
Cook Daryl W.
EMI Limited
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