ALEXANDRIA, Va., June 17 -- United States Patent no. 12,316,162, issued on May 27, was assigned to Hilti AG (Schaan, Liechtenstein).

"Connection of a rotor shaft to a laminated core" was invented by Konrad Artmann (Schondorf, Germany), Lothar Dietl (Kaufering, Germany), Tobias Schmid (Emmenhausen, Germany) and Helmut Burger (Unterdiessen, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "Rotor for an electric motor, having a rotor shaft and, mounted on the rotor shaft, a rotor core having a number of core laminations arranged along an axis of the rotor core. Each core lamination includes a central contoured aperture which is traversed by the rotor shaft and which includes at least two radially extending...