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:
May. 04, 2004
Filed:
Jul. 31, 1997
Applicant:
Inventors:
Masayuki Inoue, Fujisawa, JP;
Shigeyuki Itoh, Zushi, JP;
Yutaka Takami, Yokohama, JP;
Kenji Matsumoto, Yokohama, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/00 ; G06F 1/214 ;
U.S. Cl.
CPC ...
H04L 9/00 ; G06F 1/214 ;
Abstract
An IC card and a method thereof for adding or changing a program for a memory for writing without adversely affecting the function of the IC card and by keeping the security of a program to be written later by restricting writing by a write control program having a decryption function or a program code conversion function.