Testing tube construction for measuring sodium hydroxide and/or calcium oxide
US4259287A · kind A · utility
8Cited by
2References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 25, 1979 |
| Grant date | Mar 31, 1981 |
| Priority date | — |
| Expiry date | Oct 25, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/15
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A testing tube for measuring sodium hydroxide and/or calcium oxide aerosols, comprises, a glass tube having breakoff points at each end to open at each end and containing a front layer of a substrate material impregnated with ammonium chloride and a following indicating layer of a substrate material impregnated with an acid and bromphenol blue.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.