ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,508,561, issued on Dec. 30, was assigned to Basell Polyolefine GmbH (Wesseling, Germany).

"High-pressure polymerization system and high-pressure polymerization process for the polymerization of ethylenically unsaturated monomers" was invented by Christoph Wolf (Pulheim-Dansweiler, Germany), Juergen Mohrbutter (Alfter, Germany), Andre-Armand Finette (Cologne, Germany), Michael Deuerling (Weilerswist, Germany), Danir Khayrullin (Bruehl, Germany) and Dieter Littmann (Mucke, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A high-pressure polymerization system having a) a polymerization reactor and b) a reactor blow down system having b1) a reactor bl...