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United States of America Patent
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-
Oct 25, 1988
Grant Date -
N/A
app pub date -
Aug 8, 1986
filing date -
Aug 22, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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