Visual spoilage indicator for food containers

Details Visual spoilage indicator for food containers Visual spoilage indicator for food containers

1975-10-02

1977-01-18

Queisser, Richard C.

Chemistry: physical processes

Physical processes

Crystallization

23254R, 116114AM, 426 87, G01N 3102

Patent

active

040037096

ABSTRACT:
A solution for detecting concentrations of CO.sub.2 is sealed within a pouch located on or in a food container and visually observable from outside the container. A microporous material places the indicator in gaseous communication with the food contents of the container, while maintaining isolation from the food liquids and solids. As a result, the indicator is responsive only to CO.sub.2 gas evolved within the container, and is unaffected by the particular pH of the food within the container. The CO.sub.2 detector provides a visual change when CO.sub.2 gas is detected, thus indicating probable deterioration of the food contents of the container.

REFERENCES:
patent: 2951461 (1960-09-01), Lockwood
patent: 3000706 (1961-09-01), Royce
patent: 3067015 (1962-12-01), Lawdermilt
patent: 3420635 (1969-01-01), Davis
patent: 3542567 (1970-11-01), Finley et al.
patent: 3743520 (1973-07-01), Croner

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