Thermochromic indicator materials with controlled reversibility
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United States of America Patent
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Apr 14, 2009
Grant Date -
May 11, 2006
app pub date -
Dec 28, 2004
filing date -
Jun 28, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermal indicator material which comprises a plurality of polythiophenes having a second low temperature color and a high temperature color. The polythiophenes are structured and arranged to exhibit a color change from the second low temperature color to the high temperature color when the thermal indicator material is exposed to a temperature that meets or exceeds a pre-determined temperature and to exhibit a color change from the high temperature color to a first low temperature color when the thermal indicator material is exposed to a decline in temperature from a temperature that meets or exceeds the predetermined temperature to a temperature of within the range of between about 5 to 20° C. below the pre-determined temperature that occurs in a time period of greater than 2.0 seconds.
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