Sustained release therapeutic compositions
Patent 4226849 Issued on October 7, 1980. Estimated Expiration Date: 
June 14, 1999. 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.
June 14, 1999. 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 2726982 2949401 2980589 3034964 3065143 3251824 3424842 3852421 3870790 Process for obtaining pharmaceutical sustained releases InventorAssigneeApplicationNo. 06/048344 filed on 06/14/1979US Classes:424/469, Discrete particles in supporting matrix424/480, Cellulose or derivative514/781Cellulose or derivativeExaminersPrimary: Rose, Shep K.Attorney, Agent or FirmInternational ClassA61K 9/20 (20060101)AbstractShaped pharmaceutical tablets, lozenges, suppositories and other solid dosage unit forms which have a prolonged and regular release pattern of a therapeutically active medicament incorporated therein, wherein the shaped dosage unit comprises a carrier base material of hydroxypropylmethylcellulose or a mixture thereof with up to 30% ethylcellulose and/or up to 30% sodium carboxymethylcellulose and wherein the carrier base material is subjected to hydrolysis and oxidation so as to generate thereon a desired minimum concentration of carbonyl and carboxyl groups, and then admixed and shaped with a therapeutically active medicament.Other References
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