Process for the production of an indicator for monitoring the te

Details Process for the production of an indicator for monitoring the te Process for the production of an indicator for monitoring the te

1987-08-06

1993-12-07

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

426 88, 116207, G01K 1106

Patent

active

052677940

ABSTRACT:
A process for the production of an indicator for monitoring the temperature of a cooled or deep-frozen product, such as packaged foodstuffs, pharmaceuticals and the like, is provided, which indicator shows that a predetermined critical temperature of the cooled or deep-frozen product has been exceeded. An easily applicable and economically made indicator is produced by casting a substance which is fluid or semifluid above the critical temperature into a specific geometrical shape and then cooling the substance below the critical temperature until it assumes a solid form. The critical temperature may in this connection lie above or below 0 degrees Centigrade. The change of the aggregate state of the fluid substance should to this end occur close to the critical temperature of the cooled or deep-frozen product, so that upon exceeding the critical temperature of the cooled or deep-frozen product to the point of thawing, the frozen indicator irreversibly loses its specific geometrical shape and thereby indicates thawing of the cooled or deep-frozen product in a fail-safe manner.

REFERENCES:
patent: 1917048 (1933-07-01), Midgly, Jr.
patent: 4028944 (1977-06-01), Erb
patent: 4382700 (1983-05-01), Youngren
patent: 4601588 (1986-07-01), Takahara et al.
patent: 4643588 (1987-02-01), Postle et al.
patent: 4735745 (1988-04-01), Preziosi et al.
patent: 4765243 (1973-10-01), Pickett et al.

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