Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Reexamination Certificate
2007-01-02
2007-01-02
Bos, Steven (Department: 1754)
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C423S062000
Reexamination Certificate
active
10428430
ABSTRACT:
The present invention relates to high-purity niobium monoxide powder (NbO) produced by a process of combining a mixture of higher niobium oxides and niobium metal powder or granules; heating and reacting the compacted mixture under controlled atmosphere to achieve temperatures greater than about 1800° C., at which temperature the NbO is liquid; solidifying the liquid NbO to form a body of material; and fragmenting the body to form NbO particles suitable for application as e.g., capacitor anodes. The NbO product is unusually pure in composition and crystallography, highly dense, and can be used for capacitors and for other electronic applications. The method of production of the NbO is robust, does not require high-purity feedstock, and can reclaim value from waste streams associated with the processing of NbO electronic components.
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Yan, et al., “Production of Niobium Powder by Direct Electrochemical Reduction of Solid Nb2O5in a Eutectic CaCl2-NaCl Melt”,Metallurgical and Materials Transactions B, vol. 33B, Oct. 2002, pp. 685-693.
Yan, et al., “Using Electro-Deoxidation to Synthesize Niobium Sponge from Solid Nb2O5in Alkali-Alkaline-Earth Metal Chloride Melts”,J. Mater. Res., vol. 18, No. 2, Feb. 2003, pp. 346-356.
Fonville Thomas J.
Higgins Brian J.
Motchenbacher Charles A.
Robison James W.
Bos Steven
Duane Morris LLP
Reading Alloys, Inc.
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