Method and apparatus for evaluating units stored on credit cards

Details Method and apparatus for evaluating units stored on credit cards Method and apparatus for evaluating units stored on credit cards

1986-10-14

1988-05-24

Trafton, David L.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235492, 379 91, 379144, G06K 500

Patent

active

047467860

ABSTRACT:
A method for the evaluation of used fee units of a card owner and of a central evaluation location (uP) stored on credit cards (KK) for automatic vendors.
In the present invention an evaluation method which prevents manipulations at the credit card is used.
This results in that the used fee units are stored in at least one counter (RZ1, RZ2) arranged on the credit card (KK) whose current reading is called in by the central evaluation location (uP) at intervals unknown to the card owner, particularly at randomly oriented intervals, and, subsequently is compared in the evaluation location (uP) to the most recently called-in counter reading. The account of the card owner is charged with the difference between the old and the new fee units.

REFERENCES:
patent: 3637994 (1972-01-01), Ellingboe
patent: 4007355 (1977-02-01), Moreno
patent: 4187498 (1980-02-01), Creekmore
patent: 4577061 (1986-03-01), Katzeff et al.
Funkschau; Mar. 1985; "Smart cards im Vormarsch: Elektronisches Geld"; pp. 39-41.

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