ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,466,993, issued on Nov. 11, was assigned to HENAN TIANXIANG NEW MATERIALS Co. LTD. (Henan, China).
"Ceramic tracing proppant" was invented by Tiancheng Zhang (Henan, China), Chunli Chang (Henan, China), Jianguo Xue (Henan, China), Xianwei Liu (Henan, China), Junxia Wang (Henan, China) and Lifeng Shen (Henan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a ceramic tracing proppant, and belongs to the field of oil and gas exploitation aids. The ceramic tracing proppant of the present invention is mainly prepared from a neutron absorbing material and the following raw materials in parts by weight: 60-90 parts of baux...