Patents Assigned to Hitachi Research Institute
  • Method of checking authenticity of sheet with built-in electronic circuit chip
    Patent number: 7309019
    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.
    Type: Grant
    Filed: January 4, 2006
    Date of Patent: December 18, 2007
    Assignees: Hitachi, Ltd., Hitachi Research Institute
    Inventors: Chikashi Okamoto, Kazuo Takaragi, Kazutaka Tsuji, Mitsuo Usami, Chizuko Yasunobu, Asahiko Isobe, Yasuhiro Tsunemi, Hiroyuki Yagi
  • Method of checking authenticity of sheet with built-in electronic circuit chip
    Patent number: 7007854
    Abstract: A method of checking sheets as to forgery thereof, the sheet being provided with an electronic circuit chip from which information can be read cut 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.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: March 7, 2006
    Assignees: Hitachi, Ltd., Hitachi Research Institute
    Inventors: Chikashi Okamoto, Kazuo Takaragi, Kazutaka Tsuji, Mitsuo Usami, Chizuko Yasunobu, Asahiko Isobe, Yasuhiro Tsunemi, Hiroyuki Yagi
  • Method of checking authenticity of sheet with built-in electronic circuit chip
    Publication number: 20040060978
    Abstract: A method of checking sheets 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.
    Type: Application
    Filed: September 30, 2003
    Publication date: April 1, 2004
    Applicants: HITACHI, LTD., HITACHI RESEARCH INSTITUTE
    Inventors: Chikashi Okamoto, Kazuo Takaragi, Kazutaka Tsuji, Mitsuo Usami, Chizuko Yasunobu, Asahiko Isobe, Yasuhiro Tsunemi, Hiroyuki Yagi
  • Method of checking authenticity of sheet with built-in electronic circuit chip
    Patent number: 6659353
    Abstract: A method of checking sheets as to forgery thereof, the sheet being provided with an electronic circuit chip from 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.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: December 9, 2003
    Assignees: Hitachi, Ltd., Hitachi Research Institute
    Inventors: Chikashi Okamoto, Kazuo Takaragi, Kazutaka Tsuji, Mitsuo Usami, Chizuko Yasunobu, Asahiko Isobe, Yasuhiro Tsunemi, Hiroyuki Yagi