Sustained release oral suspensions
Patent 4999189 Issued on March 12, 1991. Estimated Expiration Date: 
November 14, 2008. 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.
November 14, 2008. 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 1385525 Prolonged release pharmaceutical preparations Liquid prolonged release pharmaceutical formulations containing ionic constituents Controlled release pharmaceutical preparations Patent #: 4847077 InventorsAssigneeApplicationNo. 270311 filed on 11/14/1988US Classes:424/493, Containing polysaccharides (e.g., sugars)424/78.16, Amine containing aromatic group424/483, Ion-exchange resins424/484, Matrices424/490, Coated (e.g., microcapsules)424/494, Cellulose derivatives424/497, Containing solid synthetic polymers514/781, Cellulose or derivative514/964SUSTAINED OR DIFFERENTIAL RELEASE TYPEExaminersPrimary: Brown, Johnnie R.Assistant: Pili-Curtis, C. Attorney, Agent or FirmForeign Patent References
International ClassesA61K 031/74A61K 009/14 A61K 047/00 A61K 009/50 AbstractStable sustained release wax- and polymer-coated drug-ion exchange resin complexes especially useful in preparing oral suspensions are disclosed.Other References
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