Thermochromic Indicators
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United States of America Patent
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app pub date -
Apr 13, 2016
filing date -
May 3, 2000
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Abstract
This invention relates to an apparatus for indicating a temperature outside of a chosen range and the duration of time the temperature was outside that range. More specifically, it relates to the application of material to a label wherein temperatures above the material's melting point cause it to migrate on that label and indicate such temperatures were exceeded and, by the distance of that migration, the duration of time such temperatures were exceeded.
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