Processes for preparation of microspheres
Patent 4166800 Issued on September 4, 1979. Estimated Expiration Date: 
July 31, 1998. 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.
July 31, 1998. 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 3317434 3427250 3703474 InventorAssigneeApplicationNo. 05/929517 filed on 07/31/1978US Classes:427/212, PARTICLES, FLAKES, OR GRANULES COATED OR ENCAPSULATED264/4.4, Solid-walled microcapsule formed by cooling molten materials424/494, Cellulose derivatives424/497, Containing solid synthetic polymers427/2.16, Retarded or controlled-release layer produced (e.g., enteric)427/2.21, Retarded or controlled-release layer produced (e.g., enteric)427/213.3, Solid encapsulation process utilizing an emulsion or dispersion to form a solid-walled microcapsule (includes liposome)427/221, Resin, rubber, or hardenable oil containing coating428/402.24, Microcapsule with solid core (includes liposome)430/138MICROCAPSULE, PROCESS, COMPOSITION, OR PRODUCTExaminersPrimary: Silverberg, SamAttorney, Agent or FirmInternational ClassesA01N 25/28 (20060101)A01N 25/26 (20060101) A61K 8/72 (20060101) A61K 8/85 (20060101) A61K 9/16 (20060101) A61K 9/50 (20060101) A61K 8/04 (20060101) B01J 13/06 (20060101) B01J 13/08 (20060101) AbstractMicrospheres, prepared by the low-temperature e.g., -40° to -100° C., phase separation of a polymer and a core material. |
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