Time temperature indicator by chromatography and photonic lattice changes
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United States of America Patent
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Jan 17, 2017
Grant Date -
Jun 13, 2013
app pub date -
Dec 11, 2012
filing date -
Dec 13, 2011
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Abstract
A time-temperature indicator (TTI) uses polymer hardening properties to “set” or retain indications of temperature history. The TTI includes a mesh layer affixed to a thermo-conductive adhesive layer and a photonic crystal patterned film affixed to the mesh layer. The photonic crystal shows a property of bandgap shift vs temperature and responds to a predetermined range of temperatures to provide a visible indication of the range of temperatures. A hardener pouch is affixed to one end of the mesh layer and releases hardener in response to an initiating event, so that the photonic crystal material responds to the hardener by presenting a fixed state.
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