US Patent Issued to SHELL USA on June 23 for "Anti-ageing additives for bitumen" (British, Indian Inventors)

ALEXANDRIA, Va., July 15 -- United States Patent no. 12,662,589, issued on June 23, was assigned to SHELL USA INC..

"Anti-ageing additives for bitumen" was invented by Dawid John D'Melo (Bangalore, India), Richard Ernest Taylor (London) and Bulent Tugal (London).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to an additive composition comprising primary anti-oxidants and a secondary anti-oxidant, wherein the primary anti-oxidants are a phenyl phosphite and 3,3'-thiodipropionic acid dioctadecylester, and wherein the secondary anti-oxidant is epoxidized soybean oil. The invention additionally relates a bituminous composition comprising primary anti-oxidants and a secondary anti-oxidant, wh...