Time-temperature integrating indicator device

Details Time-temperature integrating indicator device Time-temperature integrating indicator device

1974-10-16

1976-01-13

Serwin, R. E.

Chemistry: physical processes

Physical processes

Crystallization

23254R, 73356, 73358, 1161145, G01N 2106, G01N 2120, G01N 1112

Patent

active

039321347

ABSTRACT:
Temperature time integrating indicator device in which a gas generating material located at one end of the device and activated at time of use of the device is absorbed by an indicating wick extending in the device in a direction away from the gas source, which wick changes color to denote a time-temperature integral and hence the temperature history of a product, there being a gas barrier means extending along the longitudinal sides of the wick for inhibiting gas transport to insure that substantially all gas absorbed by the wick makes first contact with the wick at the end nearest the gas source thus precluding first gas contact with the wick at more remote location with consequent erroneous temperature history indication.

REFERENCES:
patent: 2552477 (1951-05-01), Cole
patent: 2671028 (1954-03-01), Clark
patent: 3414415 (1968-12-01), Broad, Jr.
patent: 3697227 (1972-10-01), Goldstein et al.

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