ALEXANDRIA, Va., Feb. 12 -- United States Patent no. 12,221,379, issued on Feb. 11, was assigned to SHENZHEN UNIVERSITY (Guangdong, China).

"Method for preparing non-sintered shell-wrapped ceramsite using solid waste meanwhile immobilizing heavy metal in river sediment, and non-sintered river-sediment-based ceramsite" was invented by Hongzhi Cui (Shenzhen, China), Dapeng Zheng (Shenzhen, China), Qiangwei Pang (Shenzhen, China), Yu Jin (Shenzhen, China) and Yuan Fang (Shenzhen, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are a method for preparing a non-sintered shell-wrapped ceramsite using solid waste meanwhile immobilizing a heavy metal in river sediment, and a non-sintered river-sedimen...