Signals and indicators – Indicators – Temperature responsive or compensating means
Patent
1977-10-31
1979-01-02
Goldstein, Herbert
Signals and indicators
Indicators
Temperature responsive or compensating means
G01K 532
Patent
active
041321863
ABSTRACT:
A freeze indicating device which provides a visible record when it has been exposed to a specified low temperature such as 0.degree. C. The indicator utilizing a two-chamber, constant volume device, one chamber having a variable volume and another chamber being expandable upon freezing of an aqueous liquid therein. The expansion of the aqueous fluid transmitting pressure to the fluid in the variable volume chamber, thus forcing some of its fluid through a capillary passage onto a visible indicator.
REFERENCES:
patent: 3055759 (1962-09-01), Bosby et al.
patent: 3435682 (1969-04-01), Linke
patent: 3631721 (1972-01-01), Nollen et al.
patent: 3884072 (1975-05-01), Cheng
Hawkins Paul M.
Manske Wendell J.
Alexander Cruzan
Goldstein Herbert
Minnesota Mining and Manufacturing Company
Sell Donald M.
Smith James A.
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