Vapor-phase moving-boundary indicator

Details Vapor-phase moving-boundary indicator Vapor-phase moving-boundary indicator

1978-08-30

1980-03-25

Serwin, R. E.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

23230R, 422 58, 116206, G01N 2106

Patent

active

041950577

ABSTRACT:
An improved vapor-phase moving-boundary indicator is described, which is useful for monitoring the time-temperature histories of perishables. The device functions by allowing a vapor to permeate through a porous substrate contacted with a solution of a polydiacetylene indicating compound wherein the solution undergoes a color change upon contact with the vapor. As the vapor permeates through and along the substrate, a visible moving boundary is created between two colors which advances as a function of time and temperature. This provides a visual record of the integrated time-temperature exposure of the article.

REFERENCES:
patent: 3501297 (1970-03-01), Cremeans
patent: 3615719 (1971-10-01), Michel et al.
patent: 3768976 (1973-10-01), Hu et al.
patent: 3844718 (1974-10-01), Cohen
patent: 3999946 (1976-12-01), Patel et al.
patent: 4042336 (1977-08-01), Larsson

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