Layered tablet for the controlled release of active substances
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United States of America Patent
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Jul 4, 2000
Grant Date -
N/A
app pub date -
Jan 7, 1998
filing date -
Jul 7, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A layered tablet for the controlled release of active substances in a liquid medium comprising at least one active substance-containing, layered matrix with contact surfaces to the liquid medium which are at least partially provided with a cover layer delaying or preventing the active substance release, is characterized by the fact that the cover layer is at least one additional layer lying with thickness gradients on contact surfaces of the layered, prefabricated matrix, or that the matrix is at least one additional layer lying with thickness gradients on contact surfaces of the layered, prefabricated cover layer, which additional layer is applied by pressing powdery or granular material on the layered, prefabricated matrix or on the layered, prefabricated cover layer.
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