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Imaged medium comprising sensor-readable indicia

  • US 6,541,100 B1
  • Filed: 12/31/1998
  • Issued: 04/01/2003
  • Est. Priority Date: 12/31/1998
  • Status: Expired due to Term
First Claim
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1. An article comprising a layer containing an image visible to the human eye under normal viewing conditions, the image containing layer having a surface on which is applied data comprising greater than 500 pixels per square inch formed by an IR dye that forms a sensor readable differential light pattern when illuminated, said dye being substantially invisible to the human eye under normal viewing conditions;

  • wherein the light absorbance of at least a portion of the surface of the layer comprising said image and underlying said data is different from the light absorbance of the dye comprising the data under the conditions in which the data is read.

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