Patent ID: 7713549

Claim:
A tablet for the extended release of a pharmaceutically active ingredient, comprising: a perforated core having a hole extending through said core, said core having a surface defined by an inner radial surface surrounding said hole, an outer radial surface, an upper lateral surface and a lower lateral surface, said core comprising at least one pharmaceutically active ingredient dispersed in at least one excipient, wherein said core comprises a plurality of layers; a first coating of high molecular weight water soluble polymer substantially covering said outer radial surface, said upper lateral surface and said lower lateral surface, wherein said high molecular weight water soluble polymer has a number-average molecular weight of at least 10,000; and a second coating of low molecular weight water soluble polymer substantially covering said first coating, said second coating having at least one pharmaceutically active ingredient dispersed therein, wherein said low molecular weight water soluble polymer has a number-average molecular weight of less than 10,000 wherein the inner radial surface is not covered by said coatings.