Stock material or miscellaneous articles – Composite – Of metal
Patent
1973-10-31
1980-12-02
Pianalto, Bernard D.
Stock material or miscellaneous articles
Composite
Of metal
428329, 428900, H01F 1002
Patent
active
042371899
ABSTRACT:
Polymodal magnetic information-recording articles formed with at least two different populations of magnetic powders, whereby at least one of the powders, being of lower intrinsic coercivity and forming means to accept a noise interference pattern, accepts a pattern which serves as a means to verify the authenticity or detect previous tampering with the magnetic recording device. More generally, the disclosure relates to polymodal recording media characterized by incorporation of a plurality of independently - erasable ferromagnetic powder populations and processes for making and using said media.
REFERENCES:
patent: 2694656 (1954-11-01), Camras
patent: 3149996 (1964-09-01), Wagner et al.
patent: 3219353 (1965-11-01), Prentky
patent: 3328195 (1967-06-01), May
patent: 3653962 (1972-04-01), Akashi et al.
patent: 3689317 (1972-09-01), Akashi et al.
patent: 3725126 (1973-04-01), Haller et al.
patent: 3740266 (1973-06-01), Akashi et al.
patent: 3761311 (1973-09-01), Perrington et al.
patent: 3767464 (1973-10-01), Akashi et al.
patent: 3775178 (1973-11-01), Perrington et al.
patent: 3790754 (1974-02-01), Black et al.
Cesari Robert A.
Deffeyes Robert J.
Kehoe Andrew F.
McKenna John F.
Pianalto Bernard D.
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