Temperature indicator for deep-frozen products

Details Temperature indicator for deep-frozen products Temperature indicator for deep-frozen products

1994-08-08

1996-02-13

Gutierrez, Diego F. F.

Signals and indicators

Indicators

Temperature responsive or compensating means

374163, 374160, 374106, 426 88, G01K 102, G01K 1106, G01K 114

Patent

active

054904765

ABSTRACT:
An apparatus for checking deep-frozen food, which irreversibly indicates if an additional storage temperature has been exceeded, is described. A flat plastic bag having transparent walls, into which eutectic mixture having a liquid/solid phase transition in the range from 0.degree. to -50.degree. C. has been introduced, together with a magnetic dispersion consisting of finely divided magnetic pigments, has a heat-conducting connection to the material to be frozen. A magnetic stripe which contains a magnetically recorded pattern and which remains connected to the bag until the indicating apparatus together with the material to be frozen has been cooled below the limiting temperature is stuck to the bag. The magnetic stripe is then removed. If the permissible limiting temperature is exceeded, the optically or magnetically readable structure produced by the magnetic stripe in the indicator bag is eliminated, permitting easy checking of the deep-frozen food. The present invention permits many potential variations by combination of a plurality of applied magnetic stripes.

REFERENCES:
patent: 483365 (1892-09-01), Rapkin et al.
patent: 2660719 (1953-11-01), Stromberg
patent: 3456614 (1969-07-01), Hampton
patent: 3675501 (1972-07-01), DeKanter
patent: 3915340 (1975-10-01), Koeleman
patent: 4850716 (1989-07-01), Baker et al.
patent: 4993843 (1991-02-01), Toupin et al.

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