Colorimetric indicator of radiation exposure
US8097668B2 · kind B2 · utility
1Cited by
6References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 27, 2007 |
| Grant date | Jan 17, 2012 |
| Priority date | — |
| Expiry date | Sep 18, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A colorimetric composition is disclosed comprising a polycarbonate resin, a dye, and a thiopropionate. The composition undergoes an irreversible color shift to a darker color upon exposure to sunlight or UV radiation. Processes for producing and/or using such a colorimetric composition are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.