ALEXANDRIA, Va., Jan. 29 -- United States Patent no. 12,210,132, issued on Jan. 28, was assigned to SHANDONG UNIVERSITY (Jinan, China).
"Method and system for exploring hidden karst pipelines" was invented by Shucai Li (Jinan, China), Huaifeng Sun (Jinan, China), Nuoya Zhang (Jinan, China), Jing Yang (Jinan, China), Yang Yang (Jinan, China) and Ziqiang Zheng (Jinan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method and system for exploring hidden karst pipelines, mainly comprising: determining an upstream and a downstream of an underground karst pipeline; laying a grounding electrode at the upstream and the downstream respectively; establishing an electromagnetic emission system through undergrou...