Retard form of pharmaceuticals with insoluble porous diffusion coatings
Patent 4361546 Issued on November 30, 1982. Estimated Expiration Date: 
June 15, 2001. 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.
June 15, 2001. 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 ReferencesInventors
AssigneeApplicationNo. 06/273643 filed on 06/15/1981US Classes:424/478, Gelatin containing424/459, Organic coatings424/462, Containing solid synthetic polymers424/480, Cellulose or derivative424/499Contains proteins or derivative or polysaccharides or derivativeExaminersPrimary: Rose, Shep K.Attorney, Agent or FirmInternational ClassesA61K 9/48 (20060101)A61K 9/28 (20060101) A61K 31/55 (20060101) Foreign Application Priority Data1978-07-15 DEAbstractA pharmaceutical dosage unit retard form having a constant, pH-independent release rate of active ingredient, consisting of a core comprising an active ingredient, and a semi-permeable diffusion coating over the core, were the coating consists of a water-insoluble film-former, a water-soluble polymer and eventually an acid-insoluble polymer incorporated therein.Other References
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