US Patent Issued to Stumatec on Jan. 13 for "Drilling system for recovering nearly undisturbed cores from loose to solid ground" (Swiss Inventor)

ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,106, issued on Jan. 13, was assigned to Stumatec AG (Uebeschi, Switzerland).

"Drilling system for recovering nearly undisturbed cores from loose to solid ground" was invented by Daniel Studer (Hofen bei Thun, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "The device is operated with a conventional rotary drive with pile hammer. The torque and the ramming impacts of the drill head are transmitted to a drilling initial tube with drill bit. A sleeve without rotation stands inside the rotating initial tube. It rests at the bottom on the inside of the drill bit rotating below it. As a special feature, the sleeve is connected to the rotating d...