ALEXANDRIA, Va., March 26 -- United States Patent no. 12,259,227, issued on March 25, was assigned to Chengdu University of Technology (Chengdu, China).

"Method for monitoring large deformation of tunnel surrounding rock based on automatic target tracking and ranging system" was invented by Lubo Meng (Chengdu, China), Junqi Fan (Chengdu, China), Guosong Sun (Chengdu, China), Fuli Kong (Chengdu, China), Tianbin Li (Chengdu, China), Xiaoyan Shi (Chengdu, China), Wei Zhou (Chengdu, China), Enlai Liu (Chengdu, China) and Xing Zhu (Chengdu, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for monitoring large deformation of a surrounding rock of a tunnel based on an automatic targeting and ranging sy...