Tamperproof magnetically readable label

Details Tamperproof magnetically readable label Tamperproof magnetically readable label

1975-05-28

1978-05-23

Cook, Daryl W.

Registers

Records

Magnetic

360 2, G06K 1900, G11B 2504

Patent

active

040906620

ABSTRACT:
A magnetizable layer having an H.sub.c of at least 3000 oersteds pre-encoded with digital data is permanently bonded to the face of a document and has a permanent protective overlayer which, if magnetizable, has relatively low H.sub.c and can be used for recording transaction data.

REFERENCES:
patent: 2550803 (1951-05-01), Goddard
patent: 2712572 (1955-07-01), Roberts
patent: 3219353 (1965-11-01), Prentky
patent: 3239824 (1966-03-01), Hare
patent: 3328195 (1967-06-01), May
patent: 3566356 (1968-02-01), Holm et al.
patent: 3627934 (1971-12-01), Riddle
patent: 3683413 (1972-08-01), Schlaepfer
patent: 3760123 (1973-09-01), Smaller
patent: 3790754 (1974-02-01), Black et al.
patent: 3808404 (1974-04-01), Riggs

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