ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,497,905, issued on Dec. 16, was assigned to RTX Corp. (Farmington, Conn.).

"Non-uniform and bi-tri stator spacing for swirl recovery vane (SRV) open rotor engines" was invented by Jeffrey T. Morton (Machester, Conn.) and Paul R. Hanrahan (Sedona, Ariz.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A swirl recovery vane (SRV) open rotor engine include an engine core, a rotor having a plurality of rotor blades mounted to an end of the engine core and a plurality of stators mounted adjacent to the rotor. The stators are spaced in a non-uniform spacing to reduce a forcing function created by movement of the rotor blades past the stators."

The patent was f...