Gas indicator for a package

Details Gas indicator for a package Gas indicator for a package

1994-05-26

1995-08-08

Redding, David A.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

422 87, 422 55, 422 56, 422 57, 436 1, 436 3, 436127, 436133, 435 31, 435 32, 435291, 435810, 426 87, 426232, G01N 3302, G01N 3122

Patent

active

054396484

ABSTRACT:
A gas indicator (11) for a modified atmosphere food package (19) comprises a series of strips (12, 13, 14, 15, 16) which progressively change colour as the proportion of carbon dioxide in the atmosphere progressively changes in magnitude due to absorption of the carbon dioxide by the food product (17) over time. The indicator (11) thus is "tuned" to indicate changing atmospheric conditions inside a see-through envelope (10) and thus the condition of the product (17) can be monitored and the package (19) is tamper evident.

REFERENCES:
patent: 4003709 (1977-01-01), Eaton et al.
patent: 4285697 (1981-08-01), Neary
patent: 4349509 (1982-09-01), Yoshikawa et al.
patent: 4772560 (1988-09-01), Attar
patent: 4994117 (1991-02-01), Fehder
patent: 5320807 (1994-06-01), Brinton et al.

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