Method of indicating time or temperature-time accumulated value as color change, and materials therefor
US5756356A · kind A · utility
70Cited by
14References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1996 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Mar 27, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/229
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of indicating a time or a temperature-time accumulated value as a color change (degree of color development), which comprises providing an oxidation-polymerizable dyestuff and the oxidizing agent in a non-contact state and bringing the oxidation-polymerizable dyestuff and the oxidizing agent into contact with each other to polymerize the oxidation-polymerizable dyestuff with the passage of time, and an indicator material therefor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.