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:
Jul. 19, 1988
Filed:
Feb. 18, 1986
Kunio Fujisaki, Owariasahi, JP;
Akiko Iwanaga, Owariasahi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A high security and rewritable IC card has a microprocessor, a memory, and a keyboard. The memory has a password registration area, an error counter area in which the number of occurrences of an error in inputting a password is stored, and a card information area. The microprocessor controls a password registration operation, registers the password inputted through the keyboard in the password registration area. When the registered password is to be updated, the microprocessor clears the password registration area in the memory to allow writing of a new password only when the microprocessor detects that a password data inputted by a card user matches the registered password and the error count in the error counter is no more than a predetermined count.