Signals and indicators – Indicators – Temperature responsive or compensating means
Patent
1988-10-06
1990-07-17
Shoap, Allan N.
Signals and indicators
Indicators
Temperature responsive or compensating means
116215, 374160, G01K 1106
Patent
active
049414259
ABSTRACT:
A method and devices for indication of temperature in frozen products are disclosed. The method involves placing an indicator having a cavity partly filled with a fluid in the freezing equipment. The fluid is frozen, and the indicator inverted. If the freezing equipment malfunctions and the freezer warms up, the fluid will melt and flow down, indicating a malfunction. The present invention includes paired indicators for use with frozen products that may be moved around in the freezing equipment; fluids in the two indicators are frozen in positions 180.degree. apart, so even if the indicator is inverted, it is still possible to get a valid temperature indication.
REFERENCES:
patent: 3701282 (1972-10-01), Peterson
patent: 4051804 (1977-10-01), Garnett
Shoap Allan N.
Worth W. Morris
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