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. 18, 2007
Filed:
Jan. 04, 2006
Chikashi Okamoto, Kawasaki, JP;
Kazuo Takaragi, Kawasaki, JP;
Kazutaka Tsuji, Kokubunji, JP;
Mitsuo Usami, Kokubunji, JP;
Chizuko Yasunobu, Tokyo, JP;
Asahiko Isobe, Tokyo, JP;
Yasuhiro Tsunemi, Tokyo, JP;
Hiroyuki Yagi, Tokyo, JP;
Chikashi Okamoto, Kawasaki, JP;
Kazuo Takaragi, Kawasaki, JP;
Kazutaka Tsuji, Kokubunji, JP;
Mitsuo Usami, Kokubunji, JP;
Chizuko Yasunobu, Tokyo, JP;
Asahiko Isobe, Tokyo, JP;
Yasuhiro Tsunemi, Tokyo, JP;
Hiroyuki Yagi, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Research Institute, Tokyo, JP;
Abstract
A method of checking a sheet as to forgery thereof, the sheet being provided with an electronic circuit chip from or in which information can be read out or written and having visible information. The method includes a step of encrypting the visible information of the sheet and storing the encrypted visible information in the electronic circuit chip, and a step of determining discriminatively the authenticity of the sheet by comparing the visible information of the sheet with the information stored in the electronic circuit chip.