Time temperature integrating indicator

Details Time temperature integrating indicator Time temperature integrating indicator

1975-09-22

1977-08-16

Aegerter, Richard E.

Chemistry: physical processes

Physical processes

Crystallization

23254R, 73339R, 73356, 73358, 1161145, G01N 2106

Patent

active

040423360

ABSTRACT:
The temperature history of a product is visually displayed as a color front on an indicator, the distance of front advancement being a function of the temperature time integral. The indicator measures the gas generation in a first compartment by a wick in a second compartment, the wick also being in communication with the first compartment. Optionally, a gas permeable film separates the gas generating material and the wick. The indicator is fine tuned for time temperature integral by incorporating into the wick a quantifier with which the gas generated reacts preferentially.

REFERENCES:
patent: 2671028 (1954-03-01), Clark
patent: 3751382 (1973-08-01), Jungberg et al.
patent: 3932134 (1976-01-01), Fang

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