ALEXANDRIA, Va., April 7 -- United States Patent no. 12,595,332, issued on April 7, was assigned to Evonik Operations GmbH (Essen, Germany).
"Preparation of polyurethane systems" was invented by Eva Emmrich-Smolczyk (Essen, Germany), Mladen Vidakovic (Duisburg, Germany), Stephan Wendel (Oldenburg, Germany) and Juan Jesus Burdeniuc (Colmar, Pa.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a process for producing polyurethanes using a component A comprising a polyhydrazide, a polysemicarbazide, a polysulfonyl hydrazide and/or carbodihydrazide, in particular a polyhydrazide, wherein the component A is employed in the form of a mixture C which further comprises a component B comprising...