The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2015
Filed:
Dec. 09, 2004
Applicants:
Josua Löffelholz, Langelsheim, DE;
Frank Behrens, Goslar, DE;
Siegfried Schmieder, Goslar, DE;
Inventors:
Assignee:
H.C. Starck GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F 1/00 (2006.01); B22F 9/00 (2006.01); C21B 15/04 (2006.01); C22B 5/20 (2006.01); C22C 1/04 (2006.01); B22F 9/24 (2006.01); C22B 5/00 (2006.01); C22B 34/24 (2006.01); H01G 9/052 (2006.01);
U.S. Cl.
CPC ...
C22C 1/045 (2013.01); B22F 9/24 (2013.01); C22B 5/00 (2013.01); C22B 34/24 (2013.01); H01G 9/0525 (2013.01);
Abstract
The invention relates to the production of valve metal powders, in particular, tantalum powders by reduction of a corresponding valve metal compound, for example, KTaF, with an alkali metal in the presence of a diluent salt, whereby the reduction is carried out in the presence of a particle diminution agent, preferably, NaSO, which is added to the reaction mixture continuously or in aliquots.