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:
Dec. 22, 2009
Filed:
May. 02, 2007
Applicants:
Knud Reuter, Krefeld, DE;
Gerd Passing, Hürth, DE;
Stephan Kirchmeyer, Leverkusen, DE;
Inventors:
Assignee:
H.C. Starck GmbH, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B 34/14 (2006.01); C07F 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
The present invention provides a new process for separating zirconium and hafnium compounds, in particular to remove traces of zirconium compounds from hafnium compounds, using fractional crystallisation, as well as hafnium compounds obtainable in accordance with this process.