Controlled release solid drug dosage forms based on mixtures of water soluble nonionic cellulose ethers and anionic surfactants
January 3, 2006. 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 ReferencesSustained release pharmaceutical composition Prolonged-release pharmaceutical compositions for oral administration, their methods of making and use Method and composition for the preparation of controlled long-acting pharmaceuticals Prolonged release therapeutic compositions based on hydroxypropylmethylcellulose Sustained release therapeutic compositions based on high molecular weight hydroxypropylmethylcellulose Sustained release pharmaceutical composition of solid medical material Patent #: 4404183 InventorsApplicationNo. 06/592570 filed on 03/26/1984US 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 carrier base material combined with a therapeutically active medicament and shaped and compressed to a solid unit dosage form having a controlled and prolonged release pattern upon administration, the carrier base material being a mixture of one or more nonionic cellulose ethers and an anionic surfactant, and wherein at least one of the cellulose ethers is methyl cellulose or hydroxypropylmethylcellulose having a number average molecular weight of at least 50,000.Other References
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