Temperature monitoring

Signals and indicators – Alarms – Fluid flow

Patent

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Details

73339R, 73343R, 73343B, 733783, G01K 1100

Patent

active

041145593

ABSTRACT:
Temperature of a blood bag or other refrigerated package is continuously monitored throughout long periods of low temperature transportation and/or storage by an attached button. If the package contents exceed the predetermined safe upper temperature limit, the button produces an indication of having exceeded such limit sometime during transportation and/or storage. The indication is provided by a visual marker mounted on a metal part having a phase transition temperature corresponding to said limit and formed above the safe temperature to have a position which holds the indicator in a visible position corresponding to excessive temperature. The wire is shaped to a second position at freezing temperatures below said safe temperature by means which provide a visual indication of such setting.

REFERENCES:
patent: 3291617 (1966-12-01), Barker
patent: 3440997 (1969-04-01), Rogen
patent: 3483748 (1969-12-01), Rogen
patent: 3483752 (1969-12-01), Rogen
patent: 3516082 (1970-06-01), Cooper
patent: 3594675 (1971-07-01), Willson
patent: 3652969 (1972-03-01), Willson
patent: 3731247 (1973-05-01), Levinn

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