Patent ID: 7891310
Filing Date: 2011-02-22
Classification: G01K,Y10S

Abstract:
1. A combination temperature exposure indicator suitable for attachment to, or association with, a host product, the combination temperature exposure indicator comprising: (a) a substrate; (b) a freeze indicator supported by the substrate to provide a visual indication of exposure of the freeze indicator to a freezing temperature; and (c) a threshold indicator supported by the substrate to provide a visual indication of exposure of the threshold indicator to a temperature above a threshold temperature; wherein the visual indication provided by the threshold indicator occurs after exposure of the threshold indicator for a time interval above a pre-determined temperature; wherein the freeze indicator comprises an indicator volume and an indicator dispersion of solid particles dispersed in a liquid medium, the indicator dispersion being contained in the indicator volume and being capable of coagulating to provide an irreversible appearance change when subjected to freezing.