Sustained release pharmaceutical composition
Patent 4138475 Issued on February 6, 1979. Estimated Expiration Date: 
September 14, 1997. 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.
September 14, 1997. 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 2853420 2887440 2921883 2928770 3146168 3247066 3400185 3492397 3835221 3917813 InventorsAssigneeApplicationNo. 05/833339 filed on 09/14/1977US Classes:424/459, Organic coatings424/456, Gelatin424/494Cellulose derivativesExaminersPrimary: Rose, Shep K.Attorney, Agent or FirmInternational ClassesA61K 31/135 (20060101)A61K 9/50 (20060101) Foreign Application Priority Data1977-06-01 GBAbstractSustained release pharmaceutical composition consisting of a hard gelatine capsule containing film coated spheroids, the spheroids comprising propranolol, or a pharmaceutically-acceptable salt thereof, in admixture with non-water-swellable microcrystalline cellulose, and the said spheroids having a film coat comprising ethylcellulose optionally together with hydroxypropyl methylcellulose and/or a plasticizer.Other References
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