Product thaw indicator

Details Product thaw indicator Product thaw indicator

1975-06-23

1976-05-25

Gill, James J.

Signals and indicators

Alarms

Fluid flow

G01K 1106

Patent

active

039585280

ABSTRACT:
A device is described for indicating the thermal history of a product, i.e., whether or not such product has thawed and then been refrozen. The device includes a housing which is secureable in good thermal contact to the exterior of a package containing a frozen product. The walls of such housing insulate the same from the environment surrounding the package, while at the same time assuring good thermal contact between such interior and the product within the package. A closed membrane is positioned within the housing for containing a diffusion agent, and a wickable material extends from such membrane to a plurality of transparent windows in the wall of the housing. A dam extends across the wickable material to separate the closed membrane from such windows in a manner controlling diffusion of the diffusion agent through the wickable material.

REFERENCES:
patent: 2614430 (1952-10-01), Ballard et al.
patent: 3177843 (1965-04-01), Geocaris
patent: 3414415 (1968-12-01), Broad
patent: 3665770 (1972-05-01), Sagi et al.

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