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:
May. 22, 2001
Filed:
Feb. 22, 2000
Applicant:
Inventors:
Hans-Peter Letschert, Hanau, DE;
Wilfried Voigt, Rodenbach, DE;
Assignee:
Cerdec Aktiengesellschaft Keramische Farben, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B 1/400 ; C01B 2/106 ;
U.S. Cl.
CPC ...
C04B 1/400 ; C01B 2/106 ;
Abstract
Tantalum(V) oxide may be nitrided with ammonia at 700 to 1250° C. to yield tantalum(V) nitride. According to the invention, nitriding and consequently pigment quality are improved by adding at least one pulverulent oxide from the series SiO,, GeO,, SnO,, TiO,, ZrO,and HfO,or a pulverulent precursor of such an oxide in a quantity of at least 0.1 wt. %, calculated as oxide, to the tantalum(V) oxide to be nitrided and then nitriding the powder mixture.