Freeze/thaw indicator

Details Freeze/thaw indicator Freeze/thaw indicator

1976-11-08

1977-12-27

Yasich, Daniel M.

Signals and indicators

Alarms

Fluid flow

62125, 252408, G01D 2100, F25B 4900

Patent

active

040648281

ABSTRACT:
A freeze-thaw indicator for evidencing thawing of frozen foods in freezer compartments which has a float disposed in the container containing an aqueous solution of urea. The float is frozen in place in an immersed condition in the urea and rises only when the aqueous solution has been subjected to thawing temperatures over a time sufficient to completely liquify the aqueous solution. The strength of the aqueous solution is adjusted so that it will not liquify during the freeze thaws cycles of frost-free-type of refrigerators.

REFERENCES:
patent: 2350637 (1944-06-01), Pittman
patent: 2788282 (1957-04-01), Hammond, Jr.
patent: 3063235 (1962-11-01), Winchell
patent: 3518961 (1970-07-01), Kovac
patent: 3520189 (1970-07-01), Mann

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