Freeze indicator employing light scattering and method of making same
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United States of America Patent
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Mar 29, 2016
Grant Date -
Feb 20, 2014
app pub date -
Aug 16, 2013
filing date -
Aug 16, 2012
priority date (Note) -
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Abstract
A freeze indicator including an indicator dispersion is described herein. Such an indicator dispersion can include: a liquid medium and particles of a colored indicator agent dispersed in the liquid medium. The colored indicator agent particles having an inherent color; wherein the indicator dispersion exhibits the inherent color of the colored indicator agent particles after freezing and is configured to have a less colored appearance before freezing and wherein light scattering masks the inherent color of the colored indicator agent particles before freezing. Some indicator dispersions can be free of color-changing chemical co-reactants. These freeze indicators can be small, have a low cost, and have a simple configuration.
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