IC card

Details IC card IC card

1986-08-08

1988-10-25

Trafton, David L.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235492, 235437, 365200, 371 10, G06K 500

Patent

active

047806028

ABSTRACT:
When data is written in a predetermined memory area of a data memory in an IC card, a comparator checks whether the data before writing and data actually written in the data memory coincide. In the event of non-coincidence of the compared data, the data to be written is written in a different memory area of the data memory.

REFERENCES:
patent: 3971916 (1976-07-01), Moreno
patent: 4102493 (1978-07-01), Moreno
patent: 4105156 (1978-08-01), Dethloff
patent: 4211919 (1980-07-01), Ugon
patent: 4382279 (1983-05-01), Ugon
patent: 4450559 (1984-05-01), Bond et al.
patent: 4520453 (1985-05-01), Chow
patent: 4592024 (1986-05-01), Sakai et al.
patent: 4650975 (1987-03-01), Kitchener
patent: 4653050 (1987-03-01), Vaillancourt

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