Timer and storage condition indicator
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United States of America Patent
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-
Oct 11, 1983
Issued Date -
N/A
app pub date -
Apr 17, 1981
filing date -
Jun 18, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A timer and storage conditions indicator for indicating the passage of a predetermined length of time under predetermined ambient physical environmental conditions, in which a carrier mixture is contained in a relatively confined area above a base layer. An absorptive layer is disposed on the base layer and accepts the carrier mixture at a predetermined rate. A barrier means is disposed between the carrier mixture and the absorptive layer, and the removal of the barrier activates the timer. Transfer means such as a capillary tube or a second absorptive layer may be disposed between the carrier mixture and the first mentioned absorptive layer.
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