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Optically active materials and articles and systems in which they may be used

  • US 9,581,740 B2
  • Filed: 05/02/2014
  • Issued: 02/28/2017
  • Est. Priority Date: 12/15/2008
  • Status: Active Grant
First Claim
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1. A method of manufacturing a retroreflective article, comprising:

  • obtaining a retroreflective sheeting; and

    positioning an infrared-reflecting multi-layer optical film on the retroreflective sheeting to form a pattern;

    wherein the infrared-reflecting multi-layer optical film is transparent and not significantly visible in the visible light spectrum; and

    wherein the retroreflective sheeting causes incident light to retroreflect via a retroreflective light path, and wherein the infrared-reflecting multi-layer optical film causes incident infrared light to be reflected from the retroreflective light path.

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