Controlled release solid drug dosage forms based on mixtures of water soluble nonionic cellulose ethers and anionic surfactants
Patent 4849229 Issued on July 18, 1989. Estimated Expiration Date: 
January 5, 2008. 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 5, 2008. 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 ReferencesMethod and composition for the preparation of controlled long-acting pharmaceuticals Sustained release pharmaceutical composition of solid medical material Patent #: 4404183 InventorsApplicationNo. 07/141474 filed on 01/05/1988US Classes:424/468, Sustained or differential release type424/465, With claimed perfecting feature in contents (e.g., excipient, lubricant, etc.)424/494Cellulose derivativesExaminersPrimary: Schenkman, LeonardAttorney, Agent or FirmInternational ClassA61K 9/20 (20060101)AbstractA therapeutically active solid unit dosage form having a controlled and prolonged release pattern upon administration, comprising a mixture of a high viscosity grade methylcellulose or hydroxypropylmethylcellulose, an alkali metal sulfate or sulfonate and a therapeutically active medicament.Other References
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