Alkali zinc halophosphate glasses
Patent 5071795 Issued on December 10, 1991. Estimated Expiration Date: 
January 9, 2011. 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.
January 9, 2011. 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 3869404 Cuprous copper and/or silver halophosphate glasses Zinc-containing phosphate glasses Rare earth-containing zinc phosphate glasses Patent #: 4996172 InventorsAssigneeApplicationNo. 639100 filed on 01/09/1991US Classes:501/44, Fluorine and phosphorus containing501/45, Phosphorus containing501/48, And aluminum or beryllium501/73Less than 40 percent by weight silicaExaminersPrimary: Bell, Mark L.Attorney, Agent or FirmInternational ClassesC03C 003/247C03C 003/16 C03C 003/17 C03C 003/062 AbstractThis invention is directed to the production of glasses demonstrating working temperatures below about 450° C., transition temperatures no higher than about 350° C., and good resistance to attack by mild aqueous alkaline solutions consisting essentially, expressed in terms of mole percent on the oxide basis of ______________________________________ Li2 O 0-25 ZnO 25-50 Na2 O 5-20 Al2 O3 0-3 K2 O 0-12 P2 O5 25-37 Li2 O + Na2 O + K2 O 15-35 SnO 0-10 ______________________________________to which are included 0.5-8% Cl and 0-5% F., as analyzed in weight percent. | |
