Method and indicator for detecting the loss of integrity of a pa

Details Method and indicator for detecting the loss of integrity of a pa Method and indicator for detecting the loss of integrity of a pa

1975-05-27

1978-07-04

Reese, Robert M.

Chemistry: physical processes

Physical processes

Crystallization

23254R, 23253TP, 23230L, 206364, 206459, 206484, B65D 7300, G01N 2106, G01N 3122

Patent

active

040985776

ABSTRACT:
A system for indicating the integrity of a normally sealed package utilizes a sensor containing a pH sensitive dye which displays a first color in equilibrium with normal atmospheric conditions and a second color when in equilibrium with an artificial atmosphere comprising an acidic gaseous material. When the air normally in the package is displaced by the artificial atmosphere, the pH sensitive dye assumes its second color. Loss of integrity of the sealed package results in loss of the acidic gaseous material. As a consequence, the pH sensitive dye reverts to its first color, thereby signaling the loss of package integrity.

REFERENCES:
patent: 1103985 (1914-07-01), Murray et al.
patent: 2567445 (1951-09-01), Parker
patent: 2787238 (1957-04-01), Luce
patent: 2995425 (1961-08-01), Fuhrmann
patent: 3011874 (1961-12-01), Deutsch
patent: 3093242 (1963-06-01), Huyck et al.
patent: 3221428 (1965-12-01), Fischler et al.
patent: 3899295 (1975-08-01), Halpern

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