ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,015, issued on May 27, was assigned to XI'AN JIAOTONG UNIVERSITY (Xi'an, China).

"Internal combustion engine with external circulation system and working method thereof" was invented by Ke Zeng (Xi'an, China), Hao Duan (Xi'an, China) and Xiaojun Yin (Xi'an, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "An internal combustion engine with an external circulation system and a working method thereof are provided. The internal combustion engine is externally connected to the external circulation system through an intake port and an exhaust port. The external circulation system is capable of operating in a circulating manner when the internal combu...