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. 08, 2007
Filed:
Feb. 27, 2003
Hirohisa Kikuyama, Izumiootsu, JP;
Masahide Waki, Izumiootsu, JP;
Hiroto Izumi, Izumiootsu, JP;
Hirofumi Yazaki, Izumiootsu, JP;
Kenji Aoki, Izumiootsu, JP;
Shinji Hashiguchi, Izumiootsu, JP;
Masatsugu Kawawaki, Izumiootsu, JP;
Yuko Murakami, Izumiootsu, JP;
Hirohisa Kikuyama, Izumiootsu, JP;
Masahide Waki, Izumiootsu, JP;
Hiroto Izumi, Izumiootsu, JP;
Hirofumi Yazaki, Izumiootsu, JP;
Kenji Aoki, Izumiootsu, JP;
Shinji Hashiguchi, Izumiootsu, JP;
Masatsugu Kawawaki, Izumiootsu, JP;
Yuko Murakami, Izumiootsu, JP;
Stella Chemifa Kabushiki Kaisha, Osaka, JP;
Abstract
An object of the present invention is to provide a method for purifying a highly pure niobium compound and/or tantalum compound, the method enabling the purification of a highly pure niobium compound and tantalum compound in a simplified manner at a low cost. The object is met by providing a method comprising adding an organic solvent to an aqueous solution containing a niobium compound and/or tantalum compound together with impurities, and then performing extraction via the solution. A niobium compound and/or tantalum compound dissolved in a solution is allowed to precipitate, and said aqueous solution is obtained by dissolving the precipitate in water.