ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,415,778, issued on Sept. 16, was assigned to KOREA KUMHO PETROCHEMICAL Co. LTD. (Seoul, South Korea).
"Method for preparing phthalonitrile-based compound" was invented by Kee Yoon Roh (Daejeon, South Korea), Nam Hyun Cho (Daejeon, South Korea) and Hee Su Kim (Daejeon, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "An embodiment of the present invention provides a method for preparing a phthalonitrile-based compound, comprising: (a) feeding a mixture comprising a phthalic acid-based compound and a nitrile-based compound into a first reaction part to react; (b) transferring a resulting product of step (a) to a second reaction part connected t...