ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,286, issued on Feb. 17, was assigned to Herrenknecht AG (Schwanau, Germany).
"Device for sinking a vertical borehole" was invented by Albert FeiBt (Achern-Onsbach, Germany), Patrick Rennkamp (Lahr, Germany) and Tilmann Schwab (Freiburg, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a device for sinking a vertical borehole, more particularly a shaft, an extraction borehole in a deposit body, or a foundation borehole in the ground, with at least one excavating tool for excavating material from the bottom of the borehole, with an at least one conveyance means arranged in the active region of the at least one excavating...