Thermochromic indicator materials with controlled reversibility
US7943063B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2009 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Apr 19, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K11/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.