Irreversible humidity indicator cards
US6698378B1 · kind B1 · utility
19Cited by
32References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2000 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Sep 12, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/222
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An irreversible humidity indicator card comprising an intermediate carrier member containing one or more holes, a clear, water vapor permeable first outer layer secured to the first side of the carrier member, a deliquescent material contained within the holes in the carrier member, a dark colored, absorbent sheet material secured to the back side of the carrier member to cover the holes in the carrier member and a second outer layer which covers the colored absorbent sheet material and a portion or all of the back side of the intermediate carrier member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.