Signals and indicators – Alarms – Fluid flow
Patent
1976-08-10
1978-10-17
Padgett, Benjamin R.
Signals and indicators
Alarms
Fluid flow
1161145, 252408, C09K 300
Patent
active
041208188
ABSTRACT:
A device for indicating irreversibly by means of color change that temperres equal to or above 7.degree. C, 10.degree. C, or 13.degree. C have occurred. A container which has an orifice therein is filled with a liquid which freezes at the temperature to be monitored. A dye is dissolved in the liquid. The orifice is placed in proximity to an indicating paper. When the container is activated by freezing, any increase in temperature after activation causes the liquid to melt, expand and escape through the orifice contacting the indicating paper thereby dying the paper and producing an irreversible signal.
REFERENCES:
patent: 1535536 (1925-04-01), McDonald
patent: 2560537 (1951-07-01), Andersen
patent: 3981683 (1976-09-01), Larsson et al.
patent: 4028944 (1977-06-01), Erb
Klimas Mary G.
Swindells Frank E.
Barr J. L.
Bellamy Werten F. W.
Gapcynski William G.
Padgett Benjamin R.
The United States of America as represented by the Secretary of
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