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:
Sep. 04, 2018
Filed:
Jun. 22, 2016
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventors:
Kei Tagami, Yokohama, JP;
Akihito Saitoh, Gotemba, JP;
Kunihiko Sekido, Suntou-gun, JP;
Michiyo Sekiya, Atami, JP;
Masashi Nishi, Susono, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G 5/06 (2006.01); C07D 493/06 (2006.01); C07D 471/06 (2006.01); C07D 307/83 (2006.01); C07D 487/06 (2006.01); G03G 5/14 (2006.01);
U.S. Cl.
CPC ...
C07D 493/06 (2013.01); C07D 307/83 (2013.01); C07D 471/06 (2013.01); C07D 487/06 (2013.01); G03G 5/142 (2013.01);
Abstract
A method for producing a carboxylic acid anhydride includes heating a composition containing a specific compound in a solvent to yield the carboxylic acid anhydride. The solvent is an aprotic polar solvent having a boiling point of 50° C. or more.