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:
Dec. 07, 2021
Filed:
Jun. 11, 2019
Applicants:
Tokuyama Corporation, Yamaguchi, JP;
Jeol Ltd., Tokyo, JP;
Inventors:
Makoto Satou, Yamaguchi, JP;
Misao Matsushige, Yamaguchi, JP;
Seketsu Fukuzawa, Tokyo, JP;
Masaki Takiwaki, Tokyo, JP;
Assignees:
TOKUYAMA CORPORATION, Tokyo, JP;
JOEL LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 281/06 (2006.01);
U.S. Cl.
CPC ...
C07C 281/06 (2013.01);
Abstract
Provided is a method for producing a high-purity, high-quality semicarbazide compound at a high yield by a simple method. The semicarbazide compound is recrystallized by a solvent containing a halogenated hydrocarbon. Dichloromethane is preferred as the halogenated hydrocarbon.