Controlled release system
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United States of America Patent
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Sep 12, 1989
Grant Date -
N/A
app pub date -
Sep 6, 1984
filing date -
Sep 15, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for the controlled release of an active material into an aqueous medium comprises a water soluble capillary tube (11) the bore (12) of which contains an active material (13). Dissolution of the active material is diffusion limited during a delay period while the capillary is dissolving. When dissolution of the tube is complete rapid dissolution of the remaining active material then takes place.
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