System for data field area acquisition in IC card for multiple services
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 16, 1989
Grant Date -
N/A
app pub date -
Sep 16, 1987
filing date -
Sep 16, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Information indicating the limit of size of area which is permitted to a service provider and an authentication code of the service supplier are stored in an IC card upon issuance. When a service is to be added, a service supplier is authenticated, and thereafter, acquistion of a data field area within a predetermined size of data field area is permitted. Thus, in the IC card for multiple services, upon addition of a new service after card issuance, the use of a remainder vacant area in the IC card by an unauthenticated service supplier and the exclusive use of the vacant area by a specific service supplier are prevented.
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