ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,479,077, issued on Nov. 25, was assigned to Hilti AG (Schaan, Liechtenstein).
"Portable power tool" was invented by Klaus-Peter Bohn (Schaan, Liechtenstein), Markus Hartmann (Mauerstetten, Germany), Carsten Peters (Sax, Switzerland), Maria Zivcec (Buchs, Switzerland) and Donato Clausi (Arlesheim, Switzerland).
According to the abstract* released by the U.S. Patent & Trademark Office: "A portable power tool has a tool holder 2, a motor 8 and an electro-pneumatic striking mechanism 4. The striking mechanism includes an excitation piston 13, a striker 14, a pneumatic chamber 18 for coupling the striker 14 to the excitation piston 13 and an anvil 15 which is arranged in the striking dire...