Air treating device
US4293095A · kind A · utility
40Cited by
15References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1979 |
| Grant date | Oct 6, 1981 |
| Priority date | — |
| Expiry date | Nov 9, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/229
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An air treating device in which the exhaustion of the operative fluid is visually signaled by a run-out signal system. The operative fluid and an immiscible signal fluid are held in a reservoir having associated therewith a substrate that selectively first wicks the operative fluid onto the evaporative surface portion of said substrate and, when the operative fluid is substantially depleted, the substrate then transports the signal fluid to the evaporative surface. The signal fluid is of a different hue from the operative fluid to provide an easily observed signal denoting exhaustion of the operative fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.