Controlled release bupropion formulation
Patent 6210716 Issued on April 3, 2001. Estimated Expiration Date: 
February 26, 2019. 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.
February 26, 2019. 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 Re33994 2011587 2987445 3143463 3146169 3538214 3773920 3819706 3885046 Osmotically driven active agent dispenser InventorsAssigneeApplicationNo. 259133 filed on 02/26/1999US Classes:424/497, Containing solid synthetic polymers424/489, Particulate form (e.g., powders, granules, beads, microcapsules, and pellets)424/490Coated (e.g., microcapsules)ExaminersPrimary: Dees, Jose G.Assistant: George, Konata M. Attorney, Agent or FirmInternational ClassesA61K 009/14A61K 009/52 A61K 009/58 AbstractA controlled release dosage form of bupropion hydrochloride which comprises:(a) a first pellet having a core of bupropion hydrochloride and hydroxypropyl methylcellulose at a weight ratio of 10:1 to 30:1 and a coating of a mixture of an acrylic resin which is soluble in acidic media and ethyl cellulose;(b) a second pellet having a core of bupropion hydrochloride and hydroxypropyl methylcellulose at a ratio of 10:1 to 30:1; an inner coating of a mixture of an acrylic resin which is soluble in acidic media and a water insoluble polymer and an outer coating which comprises an enteric coating polymer.Other References
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