Controlled release composite core coated microparticles
Patent 4623588 Issued on November 18, 1986. Estimated Expiration Date: 
December 2, 2005. 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.
December 2, 2005. 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 3089824 Composite core coated microparticles and process of preparing same Patent #: 4568559 InventorsAssigneeApplicationNo. 06/803733 filed on 12/02/1985US Classes:428/402.24, Microcapsule with solid core (includes liposome)424/497, Containing solid synthetic polymers427/2.16, Retarded or controlled-release layer produced (e.g., enteric)427/213Fluidized bed utilizedExaminersPrimary: Kittle, John E.Assistant: Shah, Mukund J. Attorney, Agent or FirmInternational ClassesA61K 9/16 (20060101)A61K 9/50 (20060101) AbstractA process for preparing coated microparticles, which process comprises preparing a solvent solution of an active ingredient to be encapsulated and a film-forming polymer, removing the solvent to provide a dry, composite, uniform admixture of the active ingredient and the polymer material, reducing the composite admixture to a defined smaller particle size distribution, coating the reduced composite core particles in a fluidized bed, with a uniform defined wall thickness of the same or substantially the same film-forming polymer material to provide composite core coated microparticles. | |
