Code reader

Details Code reader Code reader

1987-09-23

1990-02-20

Trafton, David L.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235436, 235437, 235449, 34082531, G06K 500

Patent

active

049028820

ABSTRACT:
A reliable electronic lock comprises means for reading a key card upon insertion and withdrawal. Sets of data read from the key card are compared to CRC data read from the key card to determine which set contains actual data and no false data erroneously read by the electronic lock. The CRC data is stored in scrambled form on the card to minimize the possibility of match to a set of actual and false data.

REFERENCES:
patent: 3704360 (1972-11-01), McFadden
patent: 4013997 (1977-03-01), Treadwell
patent: 4024379 (1977-05-01), Pfost et al.
patent: 4743898 (1988-05-01), Imedio

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