Method of manufacturing quartz glass crucibles with low bubble content
Patent 4632686 Issued on December 30, 1986. Estimated Expiration Date: 
February 24, 2006. 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.
February 24, 2006. 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 3853520 3902885 Method of making quartz glass crucibles, and apparatus carrying out the method Patent #: 4416680 InventorsAssigneeApplicationNo. 06/832614 filed on 02/24/1986US Classes:65/17.3, With shaping of particulate material and subsequent fusing of particles264/101, VACUUM TREATMENT OF WORK264/102, To degas or prevent gas entrapment264/311, Utilizing centrifugal force65/302, ARTICLE FORMING MEANS UTILIZING MOLD MOTION (E.G., CENTRIFUGAL CASTING)65/35, With vibrating, oscillating or agitating a preform65/71Spreading of molten glass by rotationExaminersPrimary: Kellogg, Arthur D.Attorney, Agent or FirmInternational ClassesC03B 19/09 (20060101)C03B 19/00 (20060101) AbstractIn the manufacture of a quartz glass crucible of low bubble content, a first layer of granular quartz material is disposed on the interior of a rotating mold through the walls of which a vacuum can be drawn. A second layer of finer quartz material is then disposed on the first layer. The quartz material is then heated, melted and fused to form a crucible. | |
