Thermofluorescent pigments for security and safety applications

Details Thermofluorescent pigments for security and safety applications Thermofluorescent pigments for security and safety applications

2006-10-18

2010-11-16

Michener, Jennifer K (Department: 1795)

Compositions

Nonreactive analytical, testing, or indicating compositions

C436S172000

Reexamination Certificate

active

07833438

ABSTRACT:
The invention is directed to use of polythiophenes in a method to determine the genuineness of an article which method comprises providing an article treated with a composition comprised of a polythiophene, the polythiophene having a low temperature color and a weak fluorescence and the structure of the polythiophene being designed such that when the composition is placed in a heat-exchange relationship with the article, the low temperature color will change to a high temperature color and the weak fluorescence will change to a strong fluorescence when a pre-determined temperature is met or exceeded in the article, heating the article to a temperature that meets or exceeds the pre-determined temperature and detecting the color and the fluorescence change.

REFERENCES:
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patent: 6706218 (2004-03-01), Lucht et al.
patent: 7517475 (2009-04-01), Lucht et al.
patent: 2002/0128451 (2002-09-01), Raymond et al.
patent: 2002/0149003 (2002-10-01), Lucht et al.
patent: 2005/0112768 (2005-05-01), Evans et al.

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