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System for data field area acquisition in IC card for multiple services

  • US 4,831,245 A
  • Filed: 09/16/1987
  • Issued: 05/16/1989
  • Est. Priority Date: 09/16/1986
  • Status: Expired due to Term
First Claim
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1. A system for data field area acquisition in an IC card for multiple services, comprising:

  • a plurality of data fields for storing data;

    area user identification input means;

    area user authentication code input means;

    area size demand input means;

    area user authentication means;

    area size calculating means for calculating a remainder area for an authenticated area user;

    table storage means for storing a table for data field control; and

    data field area acquiring means, the calculation of the remainder area for a user authenticated by said area user authentication means being carried out based on an input area size demand from said area size demand input means, and information stored in said table storage means, the acquistion of an additional data field area being carried out within a limit of usable area size based on the cumulative result of the area user authentication and the calculation of the remainder area for the authenticated area user.

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