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Method of checking authenticity of sheet with built-in electronic circuit chip

  • US 6,659,353 B1
  • Filed: 11/27/2001
  • Issued: 12/09/2003
  • Est. Priority Date: 12/07/1998
  • Status: Expired due to Fees
First Claim
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1. A forgery checking method of checking a sheet as to forgery thereof, said sheet being provided with an electronic circuit chip from which information can be read out and to which information can be written, said sheet having visible information thereon, and visible information of said sheet and relative position information of a sheet constituent element relative to said electronic circuit chip being stored in said electronic circuit chip, the method comprising the steps of:

  • determining relative position information of a sheet constituent element relative to said electronic circuit chip, and comparing the determined relative position information with said relative position information stored in said electronic circuit chip;

    determining visible information of the sheet and comparing the determined visible information with said visible information stored in said electronic circuit chip; and

    determining discriminatively authenticity of the sheet on the basis of at least one of the comparison results in said visible information determining step and said relative position information determining step.

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