Detector tube
US4022578A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 1976 |
| Grant date | May 10, 1977 |
| Priority date | — |
| Expiry date | May 5, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N31/224
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A detector tube for detecting halogenated hydrocarbon compounds, preferably including first and second layers wherein the first layer comprises a carrier impregnated with hexavalent chromium and sulfuric acid to which is added an activator selected from the group consisting of 3-, 4-, and 5-valent compounds of nitrogen, 5- and 7-valent compounds of iodine and compounds of 4- and 6-valent selenium. A second layer for indicating the presence of a halogen or reaction product compound comprises a support material impregnated with a benzidine derivative, which may be positioned in a first tube with the first layer or in a second tube adapted for connection during detection with a first tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.