ALEXANDRIA, Va., March 26 -- United States Patent no. 12,257,683, issued on March 25, was assigned to Hilti AG (Schaan, Liechtenstein).
"Electric hand-held power tool" was invented by Ernst-Rudolf Lubkert (Landsberg am Lech, Germany), Karin Groth (Landsberg, Germany), Uto Plank (Freising, Germany), Manuel Rosenzweig (Kaufering, Germany) and Andres Wellmann Jelic (Landsberg am Lech, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electric hand-held power tool, in particular a hammer drill and/or chipping hammer, having an electropneumatic impact mechanism which has a transmission housing, a guide tube arranged at least partially in the transmission housing, an exciter piston that is movable in an ax...