ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,486,213, issued on Dec. 2, was assigned to KANTO DENKA KOGYO Co. LTD. (Tokyo).
"Method of purifying carboxylic acid fluoride" was invented by Ryo Kimura (Gunma, Japan), Akiko Nakanishi (Tokyo) and Shohei Maehara (Gunma, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An object is to prevent lowering in the yield of R-COF due to contamination by impurities and thereby to produce a high-purity product of R-COF in a stable manner. According to the present invention, provided are: a method of purifying a carboxylic acid fluoride, comprising a step of removing a hydrogen halide by bringing a carboxylic acid fluoride containing the hydrogen halide into co...