Prolonged release pharmaceutical preparations
Patent 4221778 Issued on September 9, 1980. Estimated Expiration Date: 
January 8, 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.
January 8, 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 3138525 3143465 3487046 3499960 3594470 3629394 InventorAssigneeApplicationNo. 06/001644 filed on 01/08/1979US Classes:424/483, Ion-exchange resins424/78.12Adsorbate or treating agent contains nitrogenExaminersPrimary: Fagelson, Anna P.International ClassesA61K 47/48 (20060101)A61K 9/50 (20060101) AbstractProlonged release pharmaceutical preparations containing ion exchange resin drug complexes at least a substantial portion of which have been treated with a solvating agent and provided with a diffusion barrier coating.Other References
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