ALEXANDRIA, Va., July 21 -- United States Patent no. 12,687,121, issued on July 21, was assigned to Exax Energy Technology (Shenzhen) Co. Ltd (Shenzhen, China).

"Carbon dioxide energy storage system and control method thereof" was invented by Jie Zhang (Shenzhen, China) and Qin Wang (Shenzhen, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A carbon dioxide energy storage system and a control method thereof are provided. The system includes a gas storage unit, an energy storage component, a liquid storage unit, an energy release component that are sequentially closed-loop connected, and a gas temporary storage unit connected between the energy storage component and the energy release component. Within a...