Title: Tamperproof magnetically readable label

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.

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Inventors: Fayling, Richard E. (White Bear Lake, MN, US)

Application Number: 581543
Filing Date: 1975-05-28
Publication_date: 1978-05-23
Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)
Primary Class(es): 235/493 360/2
Other Classes:
US Patent Ref:

2550803	May, 1951	Goddard	360/21.
2712572	Jul, 1955	Roberts	360/21.
3219353	Nov, 1965	Prentky	235/61.
3239824	Mar, 1966	Hare	360/21.
3328195	Jun, 1967	May	235/61.
3566356	Feb, 1968	Holm et al.	340/149.
3627934	Dec, 1971	Riddle	360/2.
3683413	Aug, 1972	Schlaepfer	235/61.
3760123	Sep, 1973	Smaller	235/61.
3790754	Feb, 1974	Black et al.	235/61.
3808404	Apr, 1974	Riggs	235/61.

Other Refs: 987,357

Mar, 1965	UK

Primary Examiner: Cook, Daryl W.
Assistant Examiner:
Attorney: Alexander; Cruzan, Sell; Donald M., Granrud; Robert E.