ALEXANDRIA, Va., April 15 -- United States Patent no. 12,600,644, issued on April 14, was assigned to BAOTOU RESEARCH INSTITUTE OF RARE EARTHS (Baotou, China).

"Method for preparing rare earth oxide by recycling ammonia and carbon and use of rare earth oxide" was invented by Shengfeng Ma (Baotou, China), Yanhui Xu (Baotou, China), Yu Li (Baotou, China), Weihua Guan (Baotou, China), Kai Gao (Baotou, China) and Jing Song (Baotou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure discloses a method for preparing rare earth oxide by recycling ammonia and carbon, comprising the steps of: (1) heating raw materials containing a first rare earth carbonate and a first rare earth oxide with m...