Relative humidity sensitive material
US4373391A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1981 |
| Grant date | Feb 15, 1983 |
| Priority date | — |
| Expiry date | Apr 24, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S252/963
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A relative humidity sensitive material comprises a mixture of at least one hygroscopic salt and an at least partially electrically conductive metal based powder. Each salt in the relative humidity sensitive material has a cationic constituent selected from the group consisting of the alkali and alkaline earth metals and an anionic constituent selected from the group consisting of a chlorate, perchlorate, and chloro aluminate. The metal based powder preferably comprises a metal or metal oxide powder or powder mixture including such constituents as Zr, CO.sub.3 O.sub.4, and MnO.sub.2. Additionally, the material may include a binding agent and a slurry mixture may be formed for placement of the resultant material between electrodes on a substrate so as to form a relative humidity sensor. These sensors are employed either individually or configured in a system used to either indicate or control the relative humidity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.