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:
Oct. 11, 2016
Filed:
Sep. 27, 2013
Nissan Chemical Industries, Ltd., Tokyo, JP;
Hirohide Kitsuyama, Funabashi, JP;
Akihiro Nagaya, Funabashi, JP;
Hironobu Yoshino, Funabashi, JP;
Ikumasa Hidaka, Sanyo-Onda, JP;
NISSAN CHEMICAL INDUSTRIES, LTD., Tokyo, JP;
Abstract
A method for producing a high-purity nitrogen-containing heterocyclic compound includes: a process (a) and a process (b): (a) a process of mixing a mixture containing a compound and as an impurity compound with a solvent and a metal salt, and (b) a process of obtaining a mixture in a solution state in which the content of the compound has decreased compared to that in the mixture in the process (a) by filtering a mixed solution obtained in the process (a), or a process of obtaining a mixture in which the content of the compound has decreased compared to that in the mixture in the process (a) by further evaporating the solvent or crystallizing following the filtering; (where Rand Rare each independently a hydrogen atom, a Calkyl group, etc., Ris a hydrogen atom, a Calkyl group, etc., X is a hydrogen atom, etc.).