Zinc sulfophosphate glasses
Patent 5328874 Issued on July 12, 1994. Estimated Expiration Date: 
October 18, 2013. 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 18, 2013. 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 ReferencesLow melting phosphate-sulfate glasses as intumescent flame and/or smoke retardants for polymers Zinc-containing phosphate glasses Glass/glass-ceramic-plastic alloy articles Alkali zinc halophosphate glasses Phosphate-containing surgical cements Patent #: 5218035 InventorsAssigneeApplicationNo. 136893 filed on 10/18/1993US Classes:501/45, Phosphorus containing501/44, Fluorine and phosphorus containing501/46And titanium, zirconium, vanadium, tungsten, or molybdenumExaminersPrimary: Bell, Mark L.Assistant: Jones, Deborah Attorney, Agent or FirmForeign Patent References
International ClassC03C 003/16AbstractThis invention relates to the preparation of a glass exhibiting a transition temperature normally below about 300°, a working temperature below about 400°, while, at the same time, exhibiting excellent resistance to attack by water. Specifically, the present invention discloses a glass consisting essentially in terms of mole percent on the oxide basis, of 15-35% P2 O5, 1-25% SO3, 30-55% ZnO, 0-25% R2 O, wherein R2 O is selected from the group consisting of 0-25% Li2 O, 0-25% Na2 O, and 0-25% K2 O, and up to a total of 15% of optional ingredients in the indicated proportions selected from the group consisting of 0-10% Al2 O3, 0-10% MgO, 0-10% CaO, 0-10% SrO, 0-10% BaO, 0-10% MnO, 0-10% transition metal oxides and 0-15% Cl+F, as analyzed in weight percent. | |
