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US Patent 5011694 - Pharmaceutical dosage unit forms with delayed release
US Patent Issued on April 30, 1991
Estimated Patent Expiration Date:
August 1, 2009Estimated 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.
Estimated Patent Expiration Date:
August 1, 2009Estimated 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.AbstractImproved 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
| 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 coatingField of Search424/464, 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.)424/469, Discrete particles in supporting matrix264/4.6, Solid-walled microcapsule formed by physically removing a constituent (e.g., evaporation, extraction, etc.)264/4.33, Microcapsule wall derived from synthetic polymer427/336Swelling agent or solvent applied to treat coatingExaminersPrimary: Page, Thurman K.Assistant: Phelan, D. Gabrielle Attorney, Agent or FirmUS Patent References2987445, 3087860, 3148124, 4013820, Universally useable tableting ingredientsIssued on: 03/22/1977 Inventor: Farhadieh , et al.4851233, Sustained release formulations Issued on: 07/25/1989 Inventor: Khan , et al.4853249Method of preparing sustained-release pharmaceutical/preparation Issued on: 08/01/1989 Inventor: Takashima , et al. Foreign Patent References
International ClassA61K 009/20Foreign Application Priority Data1988-08-11 DE |
