Pharmaceutical dosage unit forms with delayed release
Patent 5011694 Issued on April 30, 1991. Estimated Expiration Date: 
August 1, 2009. 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 1, 2009. 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 2987445 3087860 3148124 Universally useable tableting ingredients Sustained release formulations Method of preparing sustained-release pharmaceutical/preparation Patent #: 4853249 InventorsApplicationNo. 388120 filed on 08/01/1989US Classes:424/464, Tablets, lozenges, or pills424/462, Containing solid synthetic polymers424/468, Sustained or differential release type424/473, With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.)427/336Swelling agent or solvent applied to treat coatingExaminersPrimary: Page, Thurman K.Assistant: Phelan, D. Gabrielle Attorney, Agent or FirmForeign Patent References
International ClassA61K 009/20Foreign Application Priority Data1988-08-11 DEAbstractImproved delayed release pharmaceutical dosage unit forms such as tablets are obtained by exposing a matrix of a compressed mixture of active pharmaceutical ingredient and of a polyacrylic ester polymer or a vinyl ester polymer insoluble in body fluids at the point of release to vapors of a lower alcohol.Other References
Field of SearchTablets, lozenges, or pillsContaining solid synthetic polymers Sustained or differential release type With porous, perforated, apertured, or sieved layer (e.g., dialyzing layer, microporous layer, etc.) Discrete particles in supporting matrix Solid-walled microcapsule formed by physically removing a constituent (e.g., evaporation, extraction, etc.) Microcapsule wall derived from synthetic polymer Swelling agent or solvent applied to treat coating | |
