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:
Apr. 23, 1991
Filed:
Apr. 06, 1988
Applicant:
Inventor:
Shigeyuki Kawana, Tokyo, JP;
Assignee:
Casio Computer Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
235379 ; 235441 ; 235492 ;
Abstract
An IC card internally stores two different PINs. Collation of these PINs sets the IC card having an internal data memory in different characterizing statuses. When coincidence occurs at the first PIN collation, data input to the data memory of the card is permitted. When coincidence occurs at the second PIN collation, data transfer is permitted. Accordingly, when important data is stored in the IC card and a plurality of persons handle the IC card, the data stored in the IC card can be prevented from being altered unauthorized.
Kawana, Shigeyuki. (1991). Ic card system for preventing unauthorized data alteration (U.S. Patent No. 5010237). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5010237
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