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:
Jun. 15, 2004
Filed:
Aug. 30, 2001
Applicant:
Inventors:
Jörg Bredthauer, Bonn, DE;
Benno Gries, Wolfenbüttel, DE;
Bernhard Szesny, Langelsheim, DE;
Assignee:
H.C. Starck GmbH, ImSchleeke, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F 9/20 ;
U.S. Cl.
CPC ...
B22F 9/20 ;
Abstract
A process is described for the preparation of tungsten and/or molybdenum metal powder or carbide by reducing and optionally carburizing treatment of tungsten and/or molybdenum oxide powder in the presence of alkali metal compounds, wherein at least two alkali metal compounds are used in a ratio so that mixed alkali tungstate or molybdate potentially formed in an intermediate step ((Li, Na, K) WO , (Li, Na, K) MoO ) has a melting point of less than 550° C., wherein z is from 3 to 4.