Alkali metal, calcium fluorosilicate glass-ceramic articles
Patent 4386162 Issued on May 31, 1983. Estimated Expiration Date: 
October 5, 2001. 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.
October 5, 2001. 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. 06/308143 filed on 10/05/1981US Classes:501/3, Halogen containing crystalline phase (e.g., fluormica, etc.)501/5, Binary, ternary, quaternary, etc., metal silicate crystalline phase (e.g., mullite, diopside, sphene, plagioclase, slagcerams free of alumina, etc.)501/57, Fluorine501/58, And boron501/59, And aluminum501/62, And aluminum501/63And phosphorus, niobium, or tantalumExaminersPrimary: McCarthy, Helen M.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 about | |
