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Environment dependent—temperature independent color changing label

  • US 9,606,512 B2
  • Filed: 03/31/2014
  • Issued: 03/28/2017
  • Est. Priority Date: 12/13/2002
  • Status: Expired due to Fees
First Claim
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1. A timing device for monitoring an exposure to an environmental attribute comprising:

  • a. a base layer; and

    b. a timing layer comprising a sensing material that is sensitive to the environmental attribute,wherein the timing device is activated upon sensing the environmental attribute, andwherein after activation the timing layer is depleted in a longitudinal direction across timing device and one or more depletion patterns are displayed in order to indicate a level of exposure of the timing device to the environmental attribute.

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