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:
Feb. 10, 2026
Filed:
Oct. 21, 2021
Applicant:
Mitsubishi Gas Chemical Company, Inc., Chiyoda-ku, JP;
Inventors:
Hiroki Sumi, Okayama, JP;
Yuki Watanabe, Okayama, JP;
Hideaki Fujita, Okayama, JP;
Goh Nakamura, Okayama, JP;
Tatsuyuki Kumano, Okayama, JP;
Assignee:
MITSUBISHI GAS CHEMICAL COMPANY, INC., Chiyoda-ku, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C 49/675 (2006.01); C07C 45/36 (2006.01); C07C 45/82 (2006.01);
U.S. Cl.
CPC ...
C07C 49/675 (2013.01); C07C 45/36 (2013.01); C07C 45/82 (2013.01); C07C 2603/18 (2017.05);
Abstract
Provided is a method for producing fluorenone comprising an oxidation step of oxidizing fluorene in the presence of an aliphatic carboxylic acid having 2 to 3 carbon atoms, a metal catalyst, a bromine compound, and oxygen, a solvent removal step of removing the aliphatic carboxylic acid, a heating step at 120 to 350° C., and a distillation step in the order indicated.