ALEXANDRIA, Va., Aug. 25 -- United States Patent no. 12,715,831, issued on Aug. 25, was assigned to MITSUBISHI GAS CHEMICAL COMPANY INC. (Chiyoda-ku, Japan).
"Method for producing fluorenone" was invented by Yuki Watanabe (Okayama, Japan), Hiroki Sumi (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: "A method for producing fluorenone including a pretreatment step of heating fluorene in the presence of a lower aliphatic carboxylic acid, a bromine compound, and a metal catalyst, and an oxidation step of continuously supplying fluorene and oxygen to perform an oxidation reaction, in the order indic...