ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,529,349, issued on Jan. 20, was assigned to RTX Corp. (Farmington, Conn.).

"Aircraft propulsion system with variable speed rotating structure" was invented by Paul R. Hanrahan (Sedona, Ariz.) and Michael G. McCaffrey (Windsor, Conn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A propulsion system includes a first propulsor rotor, a second propulsor rotor and a gas turbine engine core. The first propulsor rotor is configured to generate propulsive thrust. The second propulsor rotor is configured to generate propulsive lift. The gas turbine engine core includes a compressor section, a combustor section, a turbine section and a rotating structure. The ro...