Vapor-phase moving-boundary indicator

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

1978-06-01

1980-03-25

Serwin, R. E.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

23230R, 116206, 422 58, G01N 2106

Patent

active

041950550

ABSTRACT:
A vapor-phase moving-boundary indicator, is described, which is useful for monitoring the time-temperature histories of perishable articles. The device functions by allowing a vapor to permeate through a porous substrate coated with an indicating solid which undergoes a color change upon contact with the vapor. As the vapor permeates through the substrate, a visible moving boundary is created between two colors and it advances as a function of time and temperature. This provides a visual record of the time-temperature exposure of the article.

REFERENCES:
patent: 2560537 (1951-07-01), Anderson
patent: 3118774 (1964-01-01), Davidson et al.
patent: 3243303 (1966-03-01), Johnson
patent: 3414415 (1968-12-01), Broad, Jr.
patent: 3615719 (1971-10-01), Michel et al.
patent: 3768976 (1973-10-01), Hu et al.
patent: 3844718 (1974-10-01), Cohen
patent: 3954011 (1976-05-01), Manske
patent: 3981683 (1976-09-01), Larsson
patent: 3999946 (1976-12-01), Patel et al.
patent: 4042336 (1977-08-01), Larsson
Wegner, Zeitschrift Fun Naturschung vol. 24b pp. 824-832 (1969).

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