Gas-filled glass beads and method of making
Patent 4547233 Issued on October 15, 1985. Estimated Expiration Date: 
May 9, 2004. 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 9, 2004. 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 2500801 3116991 Process of making glass beads from liquid medium feedstock Optical fiber Patent #: 4097258 InventorAssigneeApplicationNo. 06/610089 filed on 05/09/1984US Classes:149/2, STRUCTURE OR ARRANGEMENT OF COMPONENT OR PRODUCT501/33, Beads65/21.4, Hollow or porous particle65/22, With pore forming in situ65/31By etching or leachingExaminersPrimary: Lindsay, Robert L.Attorney, Agent or FirmInternational ClassesC03C 15/00 (20060101)C03C 11/00 (20060101) C06B 23/00 (20060101) C03B 19/00 (20060101) C03B 19/10 (20060101) Foreign Application Priority Data1983-05-13 GBAbstractA method of producing gas filled hollow glass beads comprises the steps of:i. manufacturing hollow glass beads having an alkali content of at least 20% calculated as weight per cent of oxide in the bead,ii. exposing the beads to an acidic treatment medium, for example HCl, HNO3, H2 SO4, SO2, SO3, to reduce the alkali content of the beads to not more than 15%, andiii. causing gas to diffuse into the beads.Other References
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