ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,620, issued on June 17, was assigned to Jilin University (Jilin, China).

"Self-generating heat process for in-situ conversion of medium-low mature and organic-rich shale" was invented by Wei Guo (Jilin, China), Youhong Sun (Jilin, China), Chaofan Zhu (Jilin, China), Qiang Li (Jilin, China), Sunhua Deng (Jilin, China), Yuan Wang (Jilin, China) and Zhao Liu (Jilin, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure provides a self-generating heat process for in-situ converting medium-low mature and organic-rich shale, and relates to the field of in-situ mining of medium-low mature shale rich in organic matter, the self-generat...