Vapor-phase moving-boundary indicator
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United States of America Patent
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-
Mar 25, 1980
Grant Date -
N/A
app pub date -
Jun 1, 1978
filing date -
Jun 1, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vapor-phase moving-boundary indicator, is described, which is useful for monitoring the time-temperature histories of perishable articles. The device functions by allowing a vapor to permeate through a porous substrate coated with an indicating solid which undergoes a color change upon contact with the vapor. As the vapor permeates through the substrate, a visible moving boundary is created between two colors and it advances as a function of time and temperature. This provides a visual record of the time-temperature exposure of the article.
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