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:
Mar. 22, 1994
Filed:
Oct. 16, 1991
Applicant:
Inventor:
Francois Geronimi, Aix en Provence, FR;
Assignee:
Gemplus Card International, Gemenos, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ; B42D / ;
U.S. Cl.
CPC ...
235380 ; 283 74 ;
Abstract
A method of ratifying secret codes for IC memory cards including a data processing member and a storage device for recording a secret code and data delivered to the card. It consists in determining at least one fixed-size memory zone in the storage device or systematically writing at least one bit in said zone prior to each presentation of a secret code, and in erasing all of the bits recorded in the fixed-size zone once the data processor member observes that the presented secret code corresponds to the secret code recorded in the card.