ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,447,445, issued on Oct. 21, was assigned to TORAY INDUSTRIES Inc. (Tokyo).
"Porous separation membrane" was invented by Kaori Akaike (Tokyo), Akihiro Hayashi (Otsu, Japan) and Hirokazu Sakaguchi (Otsu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention aims to provide a porous separation membrane that does not suffer a significant decrease in the protein permeability even after long term use. The porous separation membrane has an asymmetric structure with a dense layer forming one surface layer and with a coarse layer forming the other surface layer, supports a biocompatible polymer, and meet the requirements (1) and (2) given be...