Method for coating particles or liquid droplets
Patent 4675140 Issued on June 23, 1987. Estimated Expiration Date: 
May 6, 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.
May 6, 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 2648609 2955956 3015128 3167602 3415758 3672932 3687865 3691090 Method of producing microcapsules and resulting product Encapsulation process InventorsAssigneeApplicationNo. 06/730946 filed on 05/06/1985US Classes:264/4.3, With treatment subsequent to solid wall formation (e.g., coating, hardening, etc.)264/4.4, Solid-walled microcapsule formed by cooling molten materials264/4.6, Solid-walled microcapsule formed by physically removing a constituent (e.g., evaporation, extraction, etc.)264/4.7, Solid-walled microcapsule formed by in situ polymerization424/450, Liposomes424/492, Gelatin425/5, MEANS ENCAPSULATING NORMALLY LIQUID MATERIAL427/213.33, Using crosslinking agent427/213.36, Solid-walled microcapsule formed from preformed synthetic polymer427/240, CENTRIFUGAL FORCE UTILIZED427/345Coating material recirculation or regenerationExaminersPrimary: Lovering, Richard D.Attorney, Agent or FirmInternational ClassesA61K 9/50 (20060101)B01J 13/04 (20060101) AbstractSolid particles or viscous liquid droplets of core material are encapsulated in a coating material largely as single particles with a single coherent coating, by feeding a suspension of the two materials onto a rotating surface. The suspension is centrifugally dispersed by the rotating surface into relatively large coated particles and relatively small droplets of coating material. Only the size of the droplets of unused coating corresponds to the droplets formed from atomization of the liquid coating material. The size of the coated particles depends on the size of the uncoated particles and is much less dependent upon the atomization characteristics of the rotating surface. Upon being thrown from the rotating surface, or falling from that surface, the droplets and coated particles are solidified by exposure to air and are separated by sieving, or the like. The solidified droplets of pure coating material may be recycled into the suspension. Coating of all particles is achieved by dispersing the individual components of core material in the coating material before the resulting suspension reaches the rotating surface.Other References
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