Controlled release pharmaceutical preparations
Patent 4847077 Issued on July 11, 1989. Estimated Expiration Date: 
January 27, 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.
January 27, 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 References 2990332 Prolonged release pharmaceutical preparations Patent #: 4221778 InventorAssigneeApplicationNo. 07/007299 filed on 01/27/1987US Classes:424/495, Ethyl cellulose424/497, Containing solid synthetic polymers424/78.12, Adsorbate or treating agent contains nitrogen424/78.16, Amine containing aromatic group514/653, Hydroxy, bonded directly to carbon, attached directly or indirectly to the acyclic carbon or chain by acyclic nonionic bonding (e.g., beta hydroxy phenethylamines, etc.)514/781, Cellulose or derivative514/964SUSTAINED OR DIFFERENTIAL RELEASE TYPEExaminersPrimary: Schenkman, LeonardAttorney, Agent or FirmInternational ClassesA61K 9/16 (20060101)A61K 9/50 (20060101) A61K 47/48 (20060101) AbstractControlled release pharmaceutical preparations containing coated sulfonic acid cationic exchange resin drug complex particles, the resin particles having been treated, prior to coating, with about 15 to 25% by weight of glycerin, based on the combined weight of the glycerin and the drug resin complex particles.Other References
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