Temperature monitor and indicator

Measuring and testing – Gas analysis – Moisture content or vapor pressure

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Details

116114V, G01K 1106, G01K 1112

Patent

active

040388735

ABSTRACT:
A time/temperature device for monitoring and indicating variations in the ambient temperature of a space being monitored above a predetermined temperature level is encapsulated in a plastic bag, and uses a carrier to be impregnated with a fusible diffusing medium having a sharp melting point at the predetermined temperature being monitored adapted above the melting point to change from the solid phase to substantially the molten or liquid phase and vice versa below the melting point, a dye composition is formed into a mixture in a given concentration so that it can be coated at one end of the carrier, and the concentration will be in ratio to the volume of the diffusing medium so that the dye composition has a finite and reproducible diffusion rate through the diffusing medium whenever the diffusing medium is in the liquid state and exhibits no diffusion when the diffusing medium is in the solid state, and an indicating section on the face of the carrier for the time/temperature device will provide a visible measurement of the time period of days or weeks over which diffusion of the dye occurs.

REFERENCES:
patent: 2379459 (1945-07-01), Schreiber et al.
patent: 2799167 (1957-07-01), Loconti
patent: 2850393 (1958-09-01), Romito
patent: 3046786 (1962-07-01), Tessem
patent: 3243303 (1966-03-01), Johnson
patent: 3420205 (1969-01-01), Morison
patent: 3479877 (1969-11-01), Allen et al.
patent: 3828612 (1974-08-01), Erikkson et al.
patent: 3954011 (1976-05-01), Manske

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