ALEXANDRIA, Va., May 19 -- United States Patent no. 12,629,640, issued on May 19, was assigned to Henkel AG & Co. KGaA (Duesseldorf, Germany).

"Photocurable color changing compositions and method of forming features on a membrane surface using the same" was invented by Shuhua Jin (Cheshire, Conn.), Jesse Lawrence Davis (Hartford, Conn.), Chih-Min Cheng (Westford, Mass.), Zhongwei Liu (Newington, Conn.), Daniel Yi (Glastonbury, Conn.) and Tomoyo Wakamatsu (Rocky Hill, Conn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Photocurable compositions that have a color change during curing and methods of preparation and use of such compositions. More particularly, the present invention relates to photocurable compo...