US Patent Issued to HAOZHOU DRILLING ENGINEERING MACHINERY (SHANDONG) on April 29 for "Full-hole reverse circulation cluster-type down-the-hole (DTH) hammer with multiple independent channels" (Chinese Inventors)

ALEXANDRIA, Va., June 9 -- United States Patent no. 12,286,850, issued on April 29, was assigned to HAOZHOU DRILLING ENGINEERING MACHINERY (SHANDONG) Co. LTD. (Jinan, China).

"Full-hole reverse circulation cluster-type down-the-hole (DTH) hammer with multiple independent channels" was invented by Yechen Zhao (Jinan, China), Chengliang Yan (Jinan, China), Fengzheng Jing (Jinan, China), Yeshui Zhao (Jinan, China), Yechun Zhao (Jinan, China) and Da Zhang (Jinan, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A full-hole reverse circulation cluster-type down-the-hole (DTH) hammer with multiple independent channels is provided. The DTH hammer includes a drill rod, a drill rod joint, a drill rod air pipe, a ...