Method of making alkali metal, calcium fluorosilicate glass-ceramic articles
Patent 4397670 Issued on August 9, 1983. Estimated Expiration Date: 
September 13, 2002. 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.
September 13, 2002. 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 3799836 3839056 InventorAssigneeApplicationNo. 06/416961 filed on 09/13/1982US Classes:65/33.3, Halogen containing phase (e.g., crystalline or noncrystalline, etc.)65/33.9Forming product or preform from molten glassExaminersPrimary: Fisher, Richard V.Attorney, Agent or FirmInternational ClassesC03C 10/00 (20060101)C03C 10/16 (20060101) AbstractThe instant invention is directed to the production of highly crystalline glass-ceramic articles demonstrating high intrinsic mechanical strength and toughness containing crystals of canasite and/or agrellite and/or fedorite as the predominant crystal phase. The articles have overall compositions consisting essentially, expressed in terms of weight percent on the oxide basis, of aboutOther References
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