End of life indicator for automatic toilet cleaning devices
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United States of America Patent
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Jan 24, 1989
Grant Date -
N/A
app pub date -
Jul 21, 1986
filing date -
Jul 21, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An end of life indicator for use in a toilet cistern with an ambient solution containing an active disinfectant component. The end of life indicator comprises a core of water soluble dyestuff surrounded by a polymer resistant to bleaching by said disinfectant solution. Upon the depletion of the active disinfectant component surrounding the end of life indicator, the alkalinity of the solution increases to a predetermined level whereupon hydrolysis of the polymer coating continues until water penetrates or dissolves the coating sufficiently to come into contact with the water soluble dye.
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