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:
Dec. 01, 1992
Filed:
Jun. 06, 1990
Applicant:
Inventor:
Seietsu Nara, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
235492 ; 235380 ; 235382 ;
Abstract
An IC card having a CPU and a memory is used in on-line and off-line modes. The memory has a nonrewritable first memory area for storing a basic function, and a rewritable second memory area capable of storing a user application program. The IC card includes a circuit for switching between enabling and disabling accesses to the second memory area in response to the mode of the on-line and off-line.