Controlled release powder and process for its preparation
Patent 4952402 Issued on August 28, 1990. Estimated Expiration Date: 
March 17, 2008. 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.
March 17, 2008. 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 ReferencesInventorsAssigneeApplicationNo. 169447 filed on 03/17/1988US Classes:424/419, Natural or synthetic resin424/408, Capsule or pelleted or tablet424/417, Coated particulate form (e.g., liposome, etc.)424/422, Implant or insert424/423, Surgical implant or material424/426, Errodable, resorbable, or dissolving424/427, Ocular424/434, Mucosal (e.g., nasal, etc.)424/437, Otic424/440, Candy, candy coated or chewing gum424/441, Chewable tablet or wafer424/456, Gelatin424/462, Containing solid synthetic polymers424/470, Where particles are granulated424/494, Cellulose derivatives424/497, Containing solid synthetic polymers427/213.3, Solid encapsulation process utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome)428/402.24Microcapsule with solid core (includes liposome)ExaminersPrimary: Page, Thurman K.Attorney, Agent or FirmForeign Patent References
International ClassesA61K 009/58A61K 009/60 A61K 009/68 A61K 009/26 497 Foreign Application Priority Data1984-10-30 IEAbstractA controlled release powder containing discrete micro-particles for use in edible, pharmaceutical and other controlled release compositions is disclosed. The micro-particles have an average size in the range of from 0.1 to 125 μm. Each of the micro-particles is in the form of a micromatrix of an active ingredient uniformly distributed in at least one non-toxic polymer. The micro-particles have a predetermined release of active ingedient when the dissolution rate thereof is measured according to the Paddle Method of U.S. Pharmacopoeia XX at 37° C. and 75 r.p.m.Field of SearchMatricesNatural gums, resin or latex Synthetic polymer Acrylic acid and derivatives Polysaccharides (e.g., cellulose, etc.) Capsule or pelleted or tablet Coated particulate form (e.g., liposome, etc.) Errodable, resorbable, or dissolving Ocular Implant or insert Surgical implant or material Mucosal (e.g., nasal, etc.) Otic Candy, candy coated or chewing gum Chewable tablet or wafer Gelatin Containing solid synthetic polymers Where particles are granulated Cellulose derivatives | |
