ALEXANDRIA, Va., Oct. 27 -- United States Patent no. 12,774,260, issued on Oct. 27, was assigned to AXENS (Rueil-Malmaison, France).

"Process for producing olefins from oxygenates with variable production of ethylene and propylene" was invented by Stephane Haag (Frankfurt am Main, Germany), Martin Gorny (Eschborn, Germany), Bryce Williams (Frankfurt am Main, Germany) and Thomas Renner (Frankfurt am Main, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a process for producing olefins from oxygenates with variable production of ethylene and propylene. According to the invention, the process is switched from a state 1 with lower ethylene production to a state 2 with higher ethyle...