G - Physics – 01 – B
Patent
G - Physics
01
B
58/2, 150/20, 58
G01B 13/00 (2006.01) G01K 3/02 (2006.01) G01K 11/12 (2006.01) G01N 31/22 (2006.01) G04F 7/00 (2006.01) G07C 1/00 (2006.01)
Patent
CA 1103045
DEVICE FOR USE AS AN ELAPSED TIME INDICATOR OR TIME TEMPERATURE INDICATOR Abstract of the Disclosure There is provided 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 cap- sule. 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 car- rier. 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. - 1 -
302806
Couch Thomas W.
Harvey James A.
Tummers Gerardus L.j.
Akzona Incorporated
Swabey Ogilvy Renault
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