ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,391,786, issued on Aug. 19, was assigned to SHELL USA INC. (Houston).
"Antioxidant for low-density polyurethane foam" was invented by Arvind Kumar (Bangalore North, India) and Pranaya Man Singh Pradhan (Bangalore North, India).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a process for preparing a polyurethane foam comprising reacting a polyether polyol and a polyisocyanate in the presence of a blowing agent and an antioxidant, wherein: the antioxidant consists of one or two or more phenolic antioxidants, wherein the one or more phenolic antioxidants contain no atoms other than carbon, hydrogen and oxygen, and the amount of the ...