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:
Jan. 21, 2014
Filed:
Mar. 05, 2010
Yoshiharu Yamamoto, Toyama, JP;
Kazuo Sasaya, Toyama, JP;
Takayuki Fudo, Toyama, JP;
Akira Nakano, Toyama, JP;
Syunsuke Yamanaka, Itami, JP;
Takahisa Iguchi, Itami, JP;
Fumiatsu Sato, Itami, JP;
Akihiko Ikegaya, Itami, JP;
Yoshiharu Yamamoto, Toyama, JP;
Kazuo Sasaya, Toyama, JP;
Takayuki Fudo, Toyama, JP;
Akira Nakano, Toyama, JP;
Syunsuke Yamanaka, Itami, JP;
Takahisa Iguchi, Itami, JP;
Fumiatsu Sato, Itami, JP;
Akihiko Ikegaya, Itami, JP;
A.L.M.T. Corp., Tokyo, JP;
Sumitomo Electric Hardmetal Corp., Itami-shi, JP;
Sumitomo Electric Industries, Ltd., Osaka-shi, JP;
Abstract
Provided are a method for producing sodium tungstate by supplying an oxidant made of sodium nitrate or sodium nitrite to bring a tungsten containing material and the oxidant into contact with each other in an atmosphere containing oxygen to thereby continuously produce a reaction product; a method for collecting tungsten using the method; and an apparatus for producing sodium tungstate. Also provided are a method for producing a sodium tungstate aqueous solution in which a reductant is introduced into a melt containing the above-described reaction product which is then dissolved in water; and a method for collecting tungsten using the method.