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:
Feb. 13, 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
The present invention provides a method enabling the high purification of a niobium compound and/or tantalum compound in a simplified manner at a low cost. This is accomplished by providing a method enabling the high purification of a niobium compound and/or tantalum compound comprising the steps of preparing a solution containing niobium and/or tantalum, allowing a precipitate comprising niobium and/or tantalum to develop, separating the precipitate by filtration from the filtrate, converting the precipitate to a liquid melt or taking the filtrate, and separating a niobium compound from a tantalum compound or vice versa by utilizing the difference in solubility to the solvent between the niobium compound and the tantalum compound.