Iconic colorimetric test device with reduced susceptibility...

Details Iconic colorimetric test device with reduced susceptibility... Iconic colorimetric test device with reduced susceptibility...

2007-08-14

2007-08-14

Soderquist, Arlen (Department: 1743)

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

C422S051000, C422S051000, C422S067000

Reexamination Certificate

active

10944283

ABSTRACT:
Laminated test devices in which positive results are detected by the appearance of a symbol on the surface of the device due to a color change in an indicator in the device are improved by placing the indicator lamina on one side of a light-transmissive substrate sheet and a pigment lamina on the other side, the indicator lamina forming the icon and the pigment lamina forming the background, the pigment being the color of the indicator prior to the color change. This arrangement reduces false positive readings by obscuring the outlines of the symbol prior to the color change. False negative readings are reduced by further changes in the arrangement of the laminae.

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