ALEXANDRIA, Va., June 16 -- United States Patent no. 12,304,999, issued on May 20, was assigned to NOF Corp. (Tokyo).
"Method for purifying polyethylene glycol compound" was invented by Ryo Kawahara (Kawasaki, Japan), Atsushi Sato (Kawasaki, Japan), Midori Hirai (Kawasaki, Japan) and Kyu Takeuchi (Kawasaki, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for purifying a polyethylene glycol compound represented by formula [1], including a Step (A) of dissolving the compound represented by formula [1] in an organic solvent having a Hildebrand solubility parameter of 8 to 10 (cal/cm3)1/2 to obtain a solution, and a Step (B) of mixing the solution with 0.1 to 1 part by mass of an adsorbent made fro...