Opal glasses having an apatite opacifying phase
Patent 4536481 Issued on August 20, 1985. Estimated Expiration Date: 
March 23, 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.
March 23, 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 2394502 Fluorophosphate opal glasses Patent #: 4298390 InventorsAssigneeApplicationNo. 06/592960 filed on 03/23/1984US Classes:501/32, Glass and material other than glass (e.g., crystal glass, opal glass, etc.)501/59, And aluminum501/61And boronExaminersPrimary: Bell, Mark L.Attorney, Agent or FirmInternational ClassesC03C 4/00 (20060101)C03C 3/118 (20060101) C03C 3/097 (20060101) C03C 3/076 (20060101) AbstractThis invention is directed to spontaneous opal glasses containing an apatite opacifying phase and exhibiting a softening point of at least 740° C., excellent chemical durability, and a temperature interval between the high temperature crystallization liquidus and the emulsion liquidus greater than 50° C. The glasses consist essentially, in weight percent on the oxide basis, of | |
