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Method and means for producing and analyzing secret identifying code marks in machine-scanned data carriers

  • US 4,629,873 A
  • Filed: 02/10/1984
  • Issued: 12/16/1986
  • Est. Priority Date: 06/15/1979
  • Status: Expired due to Fees
First Claim
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1. A data carrier comprising a sheet, magnetic storage media on said sheet, a punch tape embedded in the sheet and concealed from visual viewing, said tape including a first set of data representing identifier information and a second set of data representing instructions for processing said identifier information, an identifying mark on the sheet, said mark having a measurable property which is related to the identifier information, and said magnetic media having data stored thereon related to the identifier information.

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