Temperature indicating device

Details Temperature indicating device Temperature indicating device

1995-11-16

1999-10-12

Hirshfeld, Andrew

Signals and indicators

Indicators

Temperature responsive or compensating means

116206, 2524081, 252962, 374162, G01K 1112

Patent

active

059641819

ABSTRACT:
A critical temperature indicating device is provided. It includes a microporous membrane, an indicating composition containing less than about 10 wt-% water, and means for containing the microporous membrane and the indicating composition. The indicating composition includes: a primary organic component comprising at least one compound that has a freezing point above the critical temperature and does not spontaneously wet out the microporous membrane at a temperature at least about 30.degree. C. above the critical temperature; a modifying component comprising at least one compound that has a freezing point below the critical temperature; and a wetting component comprising at least one compound that has a freezing point below the critical temperature and is capable of spontaneously wetting out the microporous membrane at about the critical temperature.

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