Rechargeable prepaid memory card with both unit and page counters
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 23, 1993
Issued Date -
N/A
app pub date -
Jan 7, 1992
filing date -
Jan 11, 1989
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The disclosure concerns memory cards and, more particularly, cards that are used as means of prepayment in installations for the dispensing of products and services. It is proposed to make the memory rechargeable by means of a credit counter, incrementable from outside the card, and a comparator which compares the content of this counter with that of a page counter. The page counter records the number of pages of P accounting units already used up. A no more credit signal is emitted on an external terminal when the content of the page counter reaches the content of the credit counter. A security system against the fraudulent recharging of the card is set up by an algorithm bringing into play the content of the credit counter and an identification number contained in the card.
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