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:
Nov. 18, 2014
Filed:
Jul. 05, 2011
Kazuaki Sakaki, Echizen, JP;
Hiroto Sugahara, Echizen, JP;
Tetsuya Ohashi, Echizen, JP;
Tetsuya Kume, Echizen, JP;
Masahiko Ikka, Echizen, JP;
Hirochika Naganawa, Ibaraki, JP;
Kojiro Shimojo, Ibaraki, JP;
Kazuaki Sakaki, Echizen, JP;
Hiroto Sugahara, Echizen, JP;
Tetsuya Ohashi, Echizen, JP;
Tetsuya Kume, Echizen, JP;
Masahiko Ikka, Echizen, JP;
Hirochika Naganawa, Ibaraki, JP;
Kojiro Shimojo, Ibaraki, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Nissin Chemical Industry Co., Ltd., Fukui-ken, JP;
Abstract
A rare earth metal extractant in the form of a dialkyl diglycol amic acid is synthesized by reacting diglycolic anhydride with a dialkylamine in an aprotic polar solvent, with a molar ratio of dialkylamine to diglycolic anhydride being at least 1.0, and removing the aprotic polar solvent.