Indicator system and means for irreversibly recording a temperature limit
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United States of America Patent
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-
Sep 4, 1984
Grant Date -
N/A
app pub date -
Apr 14, 1982
filing date -
Apr 14, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
System and means for irreversibly recording the incidence of a predetermined temperature comprising a cholesteric liquid crystal system and an activator material capable of interacting with the liquid crystal system to induce a unique irreversible change in the optical properties thereof sustantially at the predetermined temperature. The system preferably includes means for separating the liquid crystal system and activator at temperatures below the activation temperature of the activator.
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