Crystalline salt monomers for stable phosphate glasses
Patent 4049779 Issued on September 20, 1977. Estimated Expiration Date: 
September 20, 1994. 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 20, 1994. 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 2914380 3384453 3862298 InventorAssigneeApplicationNo. 05/644270 filed on 12/24/1975US Classes:423/309, Utilizing phosphoric acid or its anhydride as reactant23/300, With added material423/311, Orthophosphate501/45Phosphorus containingExaminersPrimary: Vertiz, O. R.Attorney, Agent or FirmAbstractPrecursors for the preparation of phosphate glasses are provided. Controlled preparation of the precursors in precise stoichiometric proportions enable the preparation of glasses which are stable and possess superior optical properties of an order similar to optical glasses. Suitable precursors within the contemplation of the invention are those having the formula:wherein M is a metal ion selected from the group consisting of Al, Zn, Cd, Fe, Sn, Mn, Pb, Ni, Co, Ga, and In and the alkaline earth metals Be, Mg, Ca, Sr and Ba and wherein n has a value of 2 or 3 depending on whether M is a divalent or trivalent ion. Mixtures of these compounds may be employed, the admixture being made prior to melting stoichiometric equivalent precursor mixture. In addition, any combination of precursors containing divalent and/or trivalent cations may be selected.Field of SearchMetal or ammonium containing |
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