ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,392,104, issued on Aug. 19, was assigned to Shandong University (Jinan, China).
"Drilling device for reinforced concrete bored pile" was invented by Lianxiang Li (Jinan, China), Chuhan Wang (Jinan, China), Shangru Zhang (Jinan, China), Xiuxi Che (Jinan, China), Yefan Qiu (Jinan, China), Shilei Zhao (Jinan, China) and Longde Guo (Jinan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A drilling device for a reinforced concrete bored pile includes drilling masts, a scalable drill rod, a rotary drill bit, a rectangular cutter and scalable cutter rods. A top end of the scalable drill rod is connected to the drilling masts, the rotary drill bit is dispo...