Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Michael G. Madara0
Patrick M. Brown0
Raymond C. Pedicone0
Rong-Chein R. Wu0
Date of Patent
October 2, 2007
0Patent Application Number
111420660
Date Filed
June 1, 2005
0Patent Primary Examiner
Patent abstract
A process for producing valve metal oxides, such as tantalum pentoxide or niobium pentoxide with a narrow particle size distribution within a desired particle size range, is provided. According to the process of the present invention, the valve metal fraction from digestion of valve metal material containing ore is processed under controlled temperature, pH, and residence time conditions to produce the valve metal pentoxide and pentoxide hydrates. Also, disclosed are new tantalum pentoxide and niobium pentoxide products and new tantalum pentoxide precursors and niobium pentoxide precursors.
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