The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 1998
Filed:
Sep. 22, 1995
Applicant:
Inventors:
Noriharu Nagata, Sanda, JP;
Hidenobu Gochi, Itami, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ; G06K / ;
U.S. Cl.
CPC ...
235492 ; 235380 ;
Abstract
An IC card includes a first auxiliary read-only memory containing identification data and a second auxiliary read/write memory. Under control of a host system, a write operation is performed into both the first and second auxiliary memories and only the data in the second auxiliary memory is updated. The host system reads the data from each of the first and second auxiliary memories and a data matching block in the host system checks each of the data against the data in a memory in the host system. Access to the main memory of the IC card is authorized only when the checking results in a match.