Prolonged release therapeutic compositions based on hydroxypropylmethylcellulose
Patent 4369172 Issued on January 18, 1983. Estimated Expiration Date: 
December 18, 2001. 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.
December 18, 2001. 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 2887440 3065143 3839319 3852421 3870790 4091205 Novel sustained release tablet formulations Sustained release therapeutic compositions Method and composition for the preparation of controlled long-acting pharmaceuticals Controlled release suppositories InventorsAssigneeApplicationNo. 06/332348 filed on 12/18/1981US Classes:424/468, Sustained or differential release type424/430, Vaginal, urethral, uterine424/473, With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.)424/480, Cellulose or derivative514/781Cellulose or derivativeExaminersPrimary: Rose, Shep K.Attorney, 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 regular and prolonged release pattern upon administration, the carrier base material being hydroxypropylmethylcellulose or a mixture of hydroxypropylmethylcellulose and up to 30% by weight of the mixture of ethylcellulose and/or up to 30% by weight of the mixture of sodium carboxymethylcellulose, and wherein the hydroxypropylmethylcellulose has a hydroxypropoxyl content of 9-12 weight % and a number average molecular weight of less than 50,000. | |
