Magnetic recording device for providing security related informa

Details Magnetic recording device for providing security related informa Magnetic recording device for providing security related informa

1979-07-31

1981-12-01

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Recording on or reproducing from an element of diverse utility

Card

235493, G11B 2504

Patent

active

043039499

ABSTRACT:
A magnetic recording device for providing security related information includes a magnetic base carrier having substantially uniform thickness and zone of increased or decreased thickness on the base carrier forming thickness increments. The thickness increments impart different magnetic characteristics to the recording device to amplitude modulate a magnetic signal recorded thereon and thereby provide security related information. Processes for the preparation and application of such a device are also disclosed.

REFERENCES:
patent: 3599153 (1971-08-01), Lewis et al.
patent: 3613101 (1971-10-01), Leonard et al.
patent: 3935361 (1976-01-01), Dortman
patent: 4081132 (1978-03-01), Pearce
patent: 4090662 (1978-05-01), Fayling
"Magnetic Printing Process"-Leveque, IBM, TDB, vol. 12, #2, 7/69.

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