Drug delivery system
Patent 5814338 Issued on September 29, 1998. Estimated Expiration Date: 
January 9, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 9, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3432594 3656997 Gastric juice resistant gelatin capsules and a process for the production thereof Ibuprofen-containing soft gelatin capsules and process for preparing same Process for coating gelatin capsules Agents for the treatment of severe pain and preparation of said agents Sustained release, bilayer buoyant dosage form Patent #: 5232704 InventorApplicationNo. 765952 filed on 01/09/1997US Classes:424/472, Layered unitary dosage forms424/451, Capsules (e.g., of gelatin, of chocolate, etc.)424/456, Gelatin424/463, Coated capsules424/488Polysaccharides (e.g., cellulose, etc.)ExaminersPrimary: Schofer, Joseph L.Assistant: Shelborne, Kathryne E. Attorney, Agent or FirmForeign Patent References
International ClassA61K 009/48Foreign Application Priority Data1994-07-11 GBAbstractThe present invention deals with a pharmaceutical product in unit dosage form and a unit dosage drug delivery system which comprises a multiple layer capsule or housing having two or more layers, the layers being of materials, wherein the outer layer possesses a hydrophilic character and the inner layer possesses a hydrophobic character, and a capsule filling wherein one or more drug substances are admixed, dissolved, suspended or agglomerated in a hydrophobic support.Other References
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