US Patent Issued to KOREA KUMHO PETROCHEMICAL on Dec. 2 for "Method of preparing a thiomethylphenol derivative" (South Korean Inventors)

ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,486,223, issued on Dec. 2, was assigned to KOREA KUMHO PETROCHEMICAL Co. LTD. (Seoul, South Korea).

"Method of preparing a thiomethylphenol derivative" was invented by Kee Yoon Roh (Daejeon, South Korea), Sang Hun Jang (Asan-si, South Korea) and Jung Hei Choi (Daejeon, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of preparing a thiomethylphenol derivative is disclosed, the method including: (a) carrying out a primary reaction of a phenol derivative represented by the following Chemical Formula 2, a mercaptan derivative represented by R4SH, and paraformaldehyde at a reaction temperature T1 under conditions in which a heterocyclic ba...