Chemical indicator compositions, indicators and methods
US9176103B2 · kind B2 · utility
3Cited by
24References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2011 |
| Grant date | Nov 3, 2015 |
| Priority date | — |
| Expiry date | Mar 13, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/78
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Chemical indicator compositions comprising a bismuth compound; elemental sulfur; and a compound with relatively high water solubility which makes the composition alkaline when exposed to water vapor at an elevated temperature; a chemical indicator comprising a substrate and the composition coated on at least a portion of a major surface of the substrate; and methods of making and using the chemical indicator are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.