Test strips and methods and apparatus for using the same
US3980437A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1975 |
| Grant date | Sep 14, 1976 |
| Priority date | — |
| Expiry date | Dec 18, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2035/00039
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A test strip of the type which is dipped into a liquid such as urine for indicating by color information with respect to the liquid. The test strip has a transparent backing on one side of which is located a color-reaction paper with a fastening layer situated between the paper and the backing for fastening the paper to the backing. The fastening layer is opaque and non-reflecting with respect to light, so that while light can pass freely through the backing it will reflected by the color-reaction paper without passing through the backing. The test strip is moved perpendicularly across an optical axis along which light is directed with the light traveling first through the transparent backing and then being reflected by the color-reaction paper. Signals are generated from the light passing through the backing and the light reflected by the color-reaction paper, with the timing of the signal from the reflected light being controlled by the signal from the light which has passed through the transparent backing. The signal from the light which has traveled through the backing is utilized to initiate a time interval after which the signal from the reflected light is generated so as to …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.