ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,545,633, issued on Feb. 10, was assigned to MITSUBISHI GAS CHEMICAL COMPANY INC. (Chiyoda-ku, Japan).
"Method for producing fluorenone" was invented by Hiroki Sumi (Okayama, Japan), Yuki Watanabe (Okayama, Japan), Hideaki Fujita (Okayama, Japan), Goh Nakamura (Okayama, Japan) and Tatsuyuki Kumano (Okayama, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "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 s...