Thermal measuring and testing – Temperature measurement – Composite temperature-related paramenter
Patent
1995-03-10
1997-09-16
Bennett, G. Bradley
Thermal measuring and testing
Temperature measurement
Composite temperature-related paramenter
374162, 116219, G01K 300
Patent
active
056673035
ABSTRACT:
A selectively activated time-temperature integrating device for providing a visually observable indication of cumulative thermal exposure, in which a viscoelastic material migrates into a diffusely light-reflective porous matrix at a rate which varies with temperature to progressively change the light transmissivity of the porous matrix and thereby provide the visually observable indication. The viscoelastic material can comprise a pressure sensitive adhesive. The visually observable indication can comprise latent indicia which initially are not visible and become visible, obscurable indicia which initially are visible and become obscured, or a combination of both. Various actuating means for selectively switching the indicator from an unactivated state to an activated state are described. Also disclosed are a method for providing a visually observable indication of cumulative thermal exposure and a method for providing a time and temperature integrating device for providing a visually observable indication of cumulative thermal exposure of an object.
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Arens Robert P.
Birkholz Russell D.
Johnson Dee Lynn
Labuza Theodore P.
Larson Curtis L.
Bennett G. Bradley
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Trussell James J.
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