ALEXANDRIA, Va., April 15 -- United States Patent no. 12,601,223, issued on April 14, was assigned to BAUER Spezialtiefbau GmbH (Schrobenhausen, Germany).
"Drilling assembly" was invented by Matthias Wachinger (Aichach-Oberbernbach, Germany) and Martin Mussack (Freising, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a drilling assembly for earth or rock drilling, comprising an inner rod, which comprises, at its distal end facing the ground, an inner drilling tool for removing ground material, and which can be connected, at its proximal end, to a rotary drive for the transmitting a drilling torque, a tubular outer rod, which surrounds the inner rod and comprises, at its dista...