ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,724,224, issued on Sept. 1, was assigned to XI'AN INSTITUTE OF OPTICS AND PRECISION MECHANICS OF CAS (Xi'an, China).

"Method for constructing initial structure of athermal optical system based on particle swarm optimization algorithm" was invented by Hu Wang (Xi'an, China), Xingyan Wang (Xi'an, China), Yaoke Xue (Xi'an, China), Yang Shen (Xi'an, China), Shangmin Lin (Xi'an, China), Qinfang Chen (Xi'an, China), Meiying Liu (Xi'an, China), Yang Liu (Xi'an, China), Canglong Zhou (Xi'an, China), Zhen Wang (Xi'an, China), Yue Pan (Xi'an, China), Jie Liu (Xi'an, China) and Yongjie Xie (Xi'an, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present di...