Controlled release dosage form comprising different cellulose ethers
Patent 4871548 Issued on October 3, 1989. Estimated Expiration Date: 
April 17, 2007. 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.
April 17, 2007. 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 ReferencesNovel sustained release tablet formulations Prolonged release therapeutic compositions based on hydroxypropylmethylcellulose Sustained release therapeutic compositions based on high molecular weight hydroxypropylmethylcellulose Process for preparing osmotic device Patent #: 4553973 InventorsAssigneeApplicationNo. 07/039405 filed on 04/17/1987US Classes:424/488, Polysaccharides (e.g., cellulose, etc.)424/451, Capsules (e.g., of gelatin, of chocolate, etc.)424/464, Tablets, lozenges, or pills424/470Where particles are granulatedExaminersPrimary: Page, Thurman K.Attorney, Agent or FirmInternational ClassA61K 9/20 (20060101)AbstractA dosage form is disclosed comprising a low number average molecular weight hydroxypropylmethylcellulose, a high number average molecular weight hydroxypropylmethylcellulose, and a beneficial drug. | |
