Microencapsulation process
Patent 4389330 Issued on June 21, 1983. Estimated Expiration Date: 
October 6, 2000. 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.
October 6, 2000. 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 3576758 3657144 3691090 3773919 InventorsAssigneeApplicationNo. 06/194127 filed on 10/06/1980US Classes:427/213.36, Solid-walled microcapsule formed from preformed synthetic polymer264/4.1, Liquid encapsulation utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome)264/4.3, With treatment subsequent to solid wall formation (e.g., coating, hardening, etc.)264/4.6, Solid-walled microcapsule formed by physically removing a constituent (e.g., evaporation, extraction, etc.)424/497, Containing solid synthetic polymers427/213.3, Solid encapsulation process utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome)436/535Antigen or antibody entrapped within the carrier (e.g., gel, hollow fiber, etc.)ExaminersPrimary: Lovering, Richard D.Attorney, Agent or FirmInternational ClassesA61K 9/16 (20060101)B01J 13/06 (20060101) B01J 13/12 (20060101) AbstractMicrocapsules laden with an active agent are prepared by a method comprising: (a) dissolving or dispersing an active agent in a solvent and dissolving a wall forming material in said solvent; (b) dispersing said solvent containing said active agent and wall forming material in a continuous-phase processing medium; (c) evaporating a portion of said solvent from said dispersion of step (b), thereby forming microcapsules containing said active agent in the suspension; and (d) extracting the remainder of the solvent from said microcapsules. |
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