Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Calorimeter
Patent
1977-05-10
1979-01-30
Wolk, Morris O.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Calorimeter
73356, 116206, 422 57, 422 58, G01D 1300, G01N 3106, G01N 3122
Patent
active
041370490
ABSTRACT:
An indicator device for use as a time indicator or a time-temperature indicator. A container is provided for housing a frangible capsule and a porous carrier. A vapor generating chemical is enclosed in the capsule. A mixture, including a second chemical, a pH change responsive indicator, and a gel forming agent are impregnated in the porous carrier. The pH of the vapor is different from the second chemical. A gel is formed from the mixture and provides uniform dispersion of the second chemical and the indicator throughout the porous carrier, as well as provides an impedance to the vapor as it moves through the porous carrier. The device is thus useful as an elapsed time indicator for certain temperature ranges as well as a time-temperature indicator for wider temperature ranges.
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Couch Thomas W.
Harvey James A.
Tummers Gerardus L. J.
Akzona Incorporated
Carter David M.
Marcus Michael S.
Wolk Morris O.
Young Francis W.
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