ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,416,258, issued on Sept. 16, was assigned to RTX Corp. (Farmington, Conn.).

"Asymmetric introduction of steam into turbine engine combustion chamber" was invented by Gregory Boardman (Owens Cross Roads, Ala.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method is provided for operating a turbine engine. During this method, fuel is injected into a combustion chamber of a combustor of the turbine engine. The combustion chamber extends circumferentially around a centerline. The fuel is combusted within the combustion chamber. Steam is introduced into the combustion chamber in an asymmetric pattern around the centerline."

The patent was filed on March ...