Retard form of pharmaceuticals with insoluble porous diffusion coatings
Patent 4459279 Issued on July 10, 1984. Estimated Expiration Date: 
August 18, 2002. 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.
August 18, 2002. 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 2853420 2928770 2971889 3247066 3344029 3371015 3538214 3835221 3917813 New oral form of medicament and a method for producing it Inventors
AssigneeApplicationNo. 06/409131 filed on 08/18/1982US Classes:424/459, Organic coatings424/473, With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.)424/480, Cellulose or derivative424/495Ethyl celluloseExaminersPrimary: 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, where 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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