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READING AND WRITING CODES USING OPTICAL DEVICES

  • US 20180341798A1
  • Filed: 03/11/2016
  • Published: 11/29/2018
  • Est. Priority Date: 03/13/2015
  • Status: Active Grant
First Claim
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1. A method for tracking an item, comprising(a) providing an item comprising a solid polymer material;

  • (b) irradiating the item to create a spatial pattern of optical modifications in the polymer material, wherein the spatial pattern of optical modifications comprises a code that indicates information; and

    (c) detecting the pattern of optical modifications, thereby determining the information.

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