Thermochromic polymers for rapid visual assessment of temperature
US6706218B2 · kind B2 · utility
20Cited by
12References
21Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 10, 2001 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Nov 17, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G61/126
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A thermochromic polymer-based temperature indicator composition which comprises a polythiophene and a carrier medium. The composition is characterized in that the polythiophene is present in the medium in an amount of about 0.05 to about 5.0% by weight based on the total weight of the composition. The structure of the compound is designed such that when the composition is placed in a heat-exchange relationship with an article, the composition will exhibit a color change when a design temperature or a temperature beyond the design temperature is reached in the article.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.