Test strips and methods and apparatus for using the same

Details Test strips and methods and apparatus for using the same Test strips and methods and apparatus for using the same

1975-12-18

1976-09-14

Reese, Robert M.

Chemistry: physical processes

Physical processes

Crystallization

356199, 356209, G01N 2130, G01N 2148, G01N 3122, G01N 3316

Patent

active

039804372

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 assure that the operation of the structure providing the signal from the reflected light takes place when the color-reaction paper intersects the optical axis.

REFERENCES:
patent: 3827808 (1974-08-01), Cho
patent: 3907503 (1975-09-01), Betts et al.

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