ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,239, issued on Dec. 30, was assigned to AIRBUS HELICOPTERS TECHNIK GMBH (Calden, Germany).

"Aviation propulsion system for an aircraft with rotatable shafts having mutually facing ends connected via shaft coupling, gearbox unit and overload protection element" was invented by Joerg Litzba (Fuldatal, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "An aviation propulsion system for an aircraft with two engines, comprising respectively a connecting shaft which is rotatably drivable in rotation by one of the engines, wherein mutually facing ends of both connecting shafts are connected to each other or are connectable to each other in a rotatably ...