Method for forming a non-hygroscopic zinc-phosphate compound and a zinc-phosphate glass
Patent 5482526 Issued on January 9, 1996. Estimated Expiration Date: 
February 17, 2014. 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.
February 17, 2014. 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 2601395 3360332 3838998 3897236 Process for producing glass articles Crystalline salt monomers for stable phosphate glasses Method of making aluminum phosphate Preparation of polymeric alkaline earth metaphosphate glasses Process for the manufacture of fused polyphosphate glasses Methods for preparing amorphous zirconium phosphosilicate InventorsAssigneeApplicationNo. 178417 filed on 02/17/1994US Classes:65/134.1, Fining or homogenizing molten glass65/85, Of glass product65/135.9, By charging batch material423/305, Metal or ammonium containing423/309, Utilizing phosphoric acid or its anhydride as reactant423/314, Metaphosphate501/48, And aluminum or beryllium501/76And zincExaminersPrimary: Jones, W. GaryAssistant: Griffin, Steven P. Attorney, Agent or FirmForeign Patent References
International ClassesC03B 005/16C01B 015/16 C01B 025/26 C03C 003/17 AbstractThe instant invention describes a method for preparing a stable, anhydrous non-hygroscopic zinc phosphate compound which is suitable for use as a batch material in the preparation of zinc-phosphate glasses. This method comprises three basic steps: first, forming an aqueous slurry mixture by intimately mixing a mixture containing phosphoric acid and a zinc-containing compound whereby the so-formed slurry mixture is comprised of a mixture of zinc hydrogen phosphates and exhibits a P2 O5 /ZnO weight ratio range between about 1.2 to 2.0; second, heating the so-formed slurry mixture to a temperature and for a time sufficient to achieve both a removal of a sufficient amount of water and the phase transformation of the zinc hydrogen phosphates resulting in zinc-phosphate material comprised of granular solid mixture of zinc metaphosphates and zinc pyrophosphate and third, cooling the zinc-phosphate material to room temperature.Other References
Field of SearchSelf-supporting particle making (e.g., bead, ball, granule, etc.)Fining or homogenizing molten glass Melt accelerator or color modifier utilized (e.g., fining agent, etc.) By charging batch material Of glass product Metaphosphate Metal or ammonium containing Utilizing phosphoric acid or its anhydride as reactant Phosphorus containing And aluminum or beryllium And lead And zinc |
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