Cyclic colorimetry method and apparatus
US3992109A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1975 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Sep 15, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/117497
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A process of and apparatus for colorimetry, whereby an indicator is added cyclically to a fluid stream to indicate the presence or absence of a condition in the stream. The presence of the condition may be indicated by the formation of a precipitate, a change of color, etc. A light source and photocell are located downstream of the point of addition of the indicator and by the difference in an optical characteristic such as the transmissivity or scattering of the fluid, at one or more wavelengths, due to the introduction of the indicator, a measure is obtained of the degree to which the tested-for condition is present in the fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.