G - Physics – 08 – B
Patent
G - Physics
08
B
116/66
G08B 5/00 (2006.01) G01N 31/22 (2006.01) G07C 1/00 (2006.01)
Patent
CA 1105781
ABSTRACT OF THE DISCLOSURE A novel depletion indicator (time watch) for remov- able substances containing acid or basic groups is disclosed, together with a novel method of use therefor. The removable substance of a predetermined concentration comes into contact with a pH color indicator that can change color at a pre- determined pH range within a much larger measurable pH range, which color change occurs as the concentration of the remov- able substance diminishes by passing through a permeable film containing both the removable substance and the pH color in- dicator. The color change occurs at a predetermined time, e.g., the same time that the active ingredient has diminished to the point it is determined to be inactive.
322320
Akzona Incorporated
Swabey Ogilvy Renault
LandOfFree
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