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:
Jul. 12, 1988
Filed:
Dec. 18, 1986
Ricardo C Pastor, Manhattan Beach, CA (US);
Luisa E Gorre, Oxnard, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
(Nb.sub.1-x Ta.sub.x).sub.2 O.sub.5 ('NTO') is purified of undesirable impurity elements present in small amounts by contacting the NTO in finely divided form to an extraction phase containing chloride, bromide, or iodide ions at a temperature whereat the ions react to remove the impurities into the extraction phase, and then the extraction phase is separated from the finely divided NTO. The process is particularly valuable in removing 3d impurities such as iron and titanium. The process can be carried out by liquid phase extraction, as with an azeotropic aqueous hydrochloric acid extraction from the NTO, or by gas phase reaction, as by reacting carbon tetrachloride with the NTO.