Defrost indicator

Details Defrost indicator Defrost indicator

1976-12-27

1979-03-20

Yasich, Daniel M.

Signals and indicators

Indicators

Temperature responsive or compensating means

73358, 426 88, 116206, G01K 1106

Patent

active

041448340

ABSTRACT:
A thaw-indicating device that is visibly positioned in a package of frozen food so to warn a consumer if the food item has ever been subjected to being thawed, and thus being spoiled even if refrozen subsequently; the device consisting of a transparent plastic capsule having a sealed singular compartment in one end of which there is a colorless, clear, frozen ice and in the other end of which there is a powdered dye that is soluble in water, so that if the ice melts into water due to thawing temperatures the entire interior of the capsule is visibly colored.

REFERENCES:
patent: 1535536 (1925-04-01), MacDonald
patent: 2379459 (1945-07-01), Schreiber et al.
patent: 2593566 (1949-01-01), Kamp
patent: 2662018 (1953-12-01), Smith
patent: 2852394 (1958-09-01), Fahringer
patent: 3220259 (1965-11-01), Beyer

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