Cold indicator for controlling the cooling or freezing of foods,

Details Cold indicator for controlling the cooling or freezing of foods, Cold indicator for controlling the cooling or freezing of foods,

1989-05-22

1991-03-12

Shoap, Allan N.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

116217, 426 88, G01K 1108

Patent

active

049988271

ABSTRACT:
The cold indicator serves for the controlling of the cooling or freezing condition of foods, medicines and the like in an arrangement in which it is in heat conducting contact with the observed cooling or freezing goods; for the activating of the cold indicator, a mechanical force is utilized, which destroys a separating filament. The cold indicator consists of two opposite lying chambers having different volumes, between whcih a separating filament is arranged and there is a freezable fluid provided in the smaller chamber. Below the observed temperature, the fluid forms a cooling or freezing tablet, and activating the cold indicator is done by destroying the separating filament, and the table is brought into the larger chamber. If the cold indicator is thawed, then the cooling or freezing tablet irreversibly loses its shape and disperses in the larger chamber, which is visible from the outside and indicates that the cold indicator has been thawed.

REFERENCES:
patent: Re25499 (1963-12-01), Fenity et al.
patent: 3194669 (1965-07-01), Koch
patent: 3701282 (1972-10-01), Peterson
patent: 3756389 (1973-09-01), Firth
patent: 3922917 (1975-12-01), Ayres
patent: 4064828 (1977-12-01), Clark
patent: 4223043 (1980-09-01), Johson
patent: 4280361 (1981-07-01), Sala
patent: 4327117 (1982-04-01), Lenack et al.
patent: 4457252 (1984-07-01), Manske

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