Signals and indicators – Indicators – Temperature responsive or compensating means
Patent
1981-11-16
1984-01-31
Yasich, Daniel M.
Signals and indicators
Indicators
Temperature responsive or compensating means
116207, 2524081, 252962, 426 88, G01N 3302, G01K 102
Patent
active
044283210
ABSTRACT:
Device which visually indicates exposure to a temperature within a predetermined range for a predetermined length of time. An opaque microporous sheet has a colored stratum on the back and a transparent fusible coating on the face. The coating is a solid solution of amorphous rubbery polymer in crystallizable solvent which, upon melting, gradually penetrates and transparentizes the microporous layer, rendering the colored stratum visible.
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Brink Richard E.
Minnesota Mining and Manufacturing Co.
Sell Donald M.
Smith James A.
Yasich Daniel M.
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