Signals and indicators – Indicators – Temperature responsive or compensating means
Patent
1985-02-14
1987-05-12
Frankfort, Charles
Signals and indicators
Indicators
Temperature responsive or compensating means
116160, 116162, G01K 1106, G01K 1108
Patent
active
046640568
ABSTRACT:
A temperature-monitoring and -witnessing device has an at least partially transparent container forming a pair of adjacent chambers at least one of which is substantially closed and formed with a passage between the chambers, a valve including a metallic shape-memory element that deforms from one shape to another shape when cooled to a predetermined transition temperature for blocking the passage when the element is of the one shape and for unblocking the passage when the element is of the other shape, a body of liquid in the one closed chamber and confined therein when the shape-memory element is of the one shape, and a dye or the like in the other chamber capable of coloring the liquid. Thus the liquid will only be colored when the element has deformed to the other shape and the device is below the transition temperature. Normally the liquid has a freezing point generally at the transition temperature. For self-readying action, remelting of the liquid serves to indicate that an upper threshold has been crossed.
REFERENCES:
patent: 3403238 (1968-09-01), Buehler
patent: 3516082 (1970-06-01), Cooper
patent: 3615719 (1971-10-01), Michel
patent: 3841551 (1974-10-01), Ota
patent: 3844248 (1974-10-01), Parker
patent: 4032071 (1977-06-01), Imoto
patent: 4038936 (1977-08-01), Kessler
patent: 4325217 (1982-04-01), Golestanch
patent: 4490976 (1985-01-01), Johnson
Title--Proceedings of the International Conference on Martensitic Transformation ICOMAT 1979--Cambridge, Mass. USA, 24-29 Jun. 1979, pp. i-xv. Dept of Materials Science & Engineering, Mass Inst. of Tecnology, Cambridge, Mass. 02139.
Corr Denis E.
Dubno Herbert
Frankfort Charles
Ross Karl F.
Societe Civile Dite "G.I.R."
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