Apparatus for production of hollow glass microspheres
Patent 5256180 Issued on October 26, 1993. Estimated Expiration Date: 
January 29, 2013. 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.
January 29, 2013. 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. 012966 filed on 01/29/1993US Classes:65/142, PARTICULATE BEAD OR BALL MAKING APPARATUS (E.G., PIN HEADING)65/21.4, Hollow or porous particle65/22With pore forming in situExaminersPrimary: Lindsay, Robert L.Attorney, Agent or FirmForeign Patent References
International ClassC03B 019/10Foreign Application Priority Data1984-06-21 FRAbstractProcesses and apparatus for the production of hollow microspheres by thermal expansion of glass particles including the thermal treatment of extremely small glass particles whose dimensions are less than 50 micrometers and, preferably, less than 35 micrometers or even 20 micrometers, which include a fluidizing agent. This technique makes possible the production of extremely small glass microspheres under satisfactory yield conditions. Also, the hollow microsphere products produced by these processes and apparatus.Other References
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