Humidity indicating method and device
US4098120A · kind A · utility
17Cited by
9References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 6, 1975 |
| Grant date | Jul 4, 1978 |
| Priority date | — |
| Expiry date | Jun 6, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/80
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Humidity indicating method and device suitable for visibly indicating exposure to a selected humidity level or for indicating a humidity-time history. The device comprises in combination a deliquescent compound, a liquid absorbent wick, and an indicating means. The change in properties of deliquescent compounds are employed to indicate a particular humidity level or a humidity-time history. Preferred methods of making humidity indicating devices are described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.