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MECHANICALLY READABLE SYSTEM USING PREMARKED SUBSTRATE

  • US 3,786,237 A
  • Filed: 03/13/1972
  • Issued: 01/15/1974
  • Est. Priority Date: 03/13/1972
  • Status: Expired due to Term
First Claim
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1. A printable substrate for encoding and readout of coded ink symbols, comprising a substrate and a plurality of repetitive patterns thereon, each such pattern consisting of at least four discrete areas each area having an ink of one coded ink component which emits radiation in a predetermined wavelength range on irradiation with a shorter wavelength radiation, each predetermined wavelength range being different from the wavelength range of the radiation from any other discrete area in the pattern repetition, said substrate being adapted to have certain portions of said repetitive patterns blocked out to encode it in accordance with a predetermined information code, thereby permitting simultaneous reading of a plurality of components in a pattern by wavelength discrimination, to read out said encoded ink symbols.

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