Resinate sustained release dextromethorphan composition
Patent 4788055 Issued on November 29, 1988. Estimated Expiration Date: 
December 9, 2005. 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 9, 2005. 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 Thixotropic compositions easily convertible to pourable liquids Patent #: 4427681 InventorsAssigneeApplicationNo. 06/806879 filed on 12/09/1985US Classes:424/483, Ion-exchange resins424/78.14, Nitrogen heterocycle514/289, Two of the cyclos share at least three ring members (i.e., bridged) (e.g., morphinans, etc.)514/850AntitussiveExaminersPrimary: Schenkman, LeonardAttorney, Agent or FirmInternational ClassesA61K 47/48 (20060101)A61K 31/485 (20060101) AbstractA pharmaceutical preparation for controlled, sustained release of dextromethorphan comprising a polystyrene sulfonate resin which has been cross-linked with about 3% to about 10% divinyl benzene, having an average particle size of at least 48 μm and less than 100 μm onto which dextromethorphan has been loaded in a ratio of dextromethorphan hydrobromid to resin of about 1:3 to about 1:10 and at least one pharmaceutically acceptable adjuvant.Other References
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