ALEXANDRIA, Va., Aug. 6 -- United States Patent no. 12,378,356, issued on Aug. 5, was assigned to NOF Corp. (Tokyo).
"Method for purifying branched polyethylene glycol" was invented by 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 branched polyethylene glycol, which includes adding, to a branched polyethylene glycol compound represented by the following formula [1] and having a weight average molecular weight of 40,000 or more:where Z, Y1, Y2, A, Polymer, l, m and b are as defined herein, at least one solid acid selected from magnesium silicate, aluminum silicate, and aluminum magnesium silicate and having a specific s...