ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,540,147, issued on Feb. 3, was assigned to TOKUYAMA Corp. (Yamaguchi, Japan).

"Method for purifying organic compound and method for producing organic compound" was invented by Shota Honda (Yamaguchi, Japan), Takashi Nishiyama (Hokkaido, Japan) and Takenori Isomura (Yamaguchi, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides a method for purifying an organic compound, by which an organic compound having a reduced lead content is obtained from an organic compound that contains a lead component as an impurity. In this method for purifying an organic compound, the organic compound that contains a lead component is irradiate...