Method for delivering an active ingredient by controlled time release utilizing a novel delivery vehicle which can be prepared by a process utilizing the active ingredient as a porogen
October 4, 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 3390050 3516941 3720534 3886084 Controlled release materials and method of use Process for production of spherical porous fillers for liquid chromatography by suspension polymerization of monovinyl and polyvinyl aromatic monomers in the presence of paraffin wax Method of manufacturing spherical polymer particles from polymer solutions Highly adsorptive macroporous polymers Process for producing controlled porosity microcapsules Encapsulation of labile biological material InventorAssigneeApplicationNo. 06/784382 filed on 10/04/1985US Classes:424/501, Contains solid synthetic resin424/502, Contains waxes, higher fatty acids, higher fatty alcohols514/963, Microcapsule-sustained or differential release514/965, Discrete particles in supporting matrix521/63Cellular product-forming process wherein the removable material is present or is produced in situ during the solid polymer formation stepExaminersPrimary: Griffin, Ronald W.Attorney, Agent or FirmInternational ClassesA61K 9/16 (20060101)C08J 9/28 (20060101) C08J 9/00 (20060101) AbstractDelivery vehicles comprised of a polymeric bead having a network of pores with an active ingredient held within the network are provided for use in a method to provide controlled release of the active ingredient. The network of pores is substantially non-collapsible upon removal of the active ingredient and the delivery vehicles are polymerized by a process in which the active ingredient also comprises the porogen during formation of the network of pores.Other References
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