Signals and indicators – Indicators – Temperature responsive or compensating means
Patent
1982-11-09
1984-07-03
Frankfort, Charles
Signals and indicators
Indicators
Temperature responsive or compensating means
116217, 374159, 374160, G01K 1100
Patent
active
044572522
ABSTRACT:
A critical temperature indicator is provided utilizing the volume reduction characteristics of organic compounds as they undergo a change from the liquid state to the solid state. The bulb and a portion of the capillary tube of a thermometer-like structure contains a colorless organic compound. Another organic compound saturated with a dye, which compound has a solidification temperature lower than that of the colorless compound and which is miscible with the colorless compound, is located in the capillary tube and separated from the colorless compound by a solid, movable plug or a liquid which is immiscible with either the colorless or the dyed compound. The volume of the colorless compound upon solidification is less than the volume of the bulb so that the separating plug or liquid and at least a portion of the dyed compound are drawn into the bulb upon solidification. The dyed compound then mixes with the colorless compound to provide a visual indication that the colorless compound has solidified.
REFERENCES:
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Anderson David W.
Frankfort Charles
Minnesota Mining and Manufacturing Company
Schuster David R.
Sell Donald M.
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