Magnetically encoded cards

Details Magnetically encoded cards Magnetically encoded cards

1989-02-07

1990-06-26

Envall, Jr., Roy N.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235449, 235494, G06K 500

Patent

active

049374362

ABSTRACT:
A magnetically encoded card (2) has a recording track (6, 8) containing data (10, 14, 16, 18) which can be read and re-written by a card reader (30), and a further recording (12) at a much higher spatial bit denisty than the data (10, 14, 16, 18). The high denisty recording (12) is formed using a special write head capable of operating at greater bit densities than the head of the card reader used to write information to the card. The card (2) is deemed valid only if the presence of the high density recording (12) is detected by a read head (34) of the card reader.

REFERENCES:
patent: 3683413 (1972-08-01), Schlaepfer
patent: 4013894 (1977-03-01), Foote et al.
patent: 4024379 (1977-05-01), Pfost et al.
patent: 4081132 (1978-03-01), Pearce
patent: 4090662 (1978-05-01), Fayling
patent: 4195771 (1980-04-01), Lagarde
patent: 4370550 (1983-01-01), Sidline

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