Thermochromic indicator materials with controlled reversibility

Details Thermochromic indicator materials with controlled reversibility Thermochromic indicator materials with controlled reversibility

2011-05-17

2011-05-17

Michener, Jennifer K (Department: 1728)

Compositions

Nonreactive analytical, testing, or indicating compositions

Reexamination Certificate

active

07943063

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.

REFERENCES:
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patent: 4732810 (1988-03-01), Kito et al.
patent: 5826915 (1998-10-01), Gregory, Jr.
patent: 6706812 (2004-03-01), Chrobaczek et al.
patent: 7517475 (2009-04-01), Lucht et al.

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