Iconic colorimetric test device with reduced susceptibility to false positive and false negative readings
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United States of America Patent
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Aug 14, 2007
Grant Date -
Mar 31, 2005
app pub date -
Sep 17, 2004
filing date -
Sep 19, 2003
priority date (Note) -
Expired
status (Latency Note)
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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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