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. 21, 2020
Filed:
Aug. 01, 2017
Applicant:
Nippon Soda Co., Ltd., Tokyo, JP;
Inventors:
Assignee:
NIPPON SODA CO., LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 303/44 (2006.01); C01B 21/093 (2006.01); C01B 21/086 (2006.01);
U.S. Cl.
CPC ...
C07C 303/44 (2013.01); C01B 21/086 (2013.01); C01B 21/093 (2013.01);
Abstract
A method for efficiently removing impurities such as sodium ions, fluoride ions, chloride ions and fluorosulfate ions without reducing the yield of a target product, including a fluorine-containing sulfonylamide compound selected from the group consisting of fluorine-containing sulfonylamide, a metal salt thereof, an ammonium salt thereof and a quaternary ammonium salt thereof is washed with an aqueous solution of salt of sulfuric acid.