ALEXANDRIA, Va., April 21 -- United States Patent no. 12,607,840, issued on April 21, was assigned to XIAMEN UNIVERSITY (Xiamen, China).

"Objective lens, optical imaging device, optical system, and test method of optical system" was invented by Hailong Wang (Xiamen, China), Songyuan Ding (Xiamen, China), Binbin Zhang (Xiamen, China) and Zhongqun Tian (Xiamen, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "An objective lens, an optical imaging device, an optical system, and a test method of the optical system, relating to the field of optical testing. The purpose is to optimize the structure of the objective lens. The objective lens comprises a housing and an optical focusing assembly. The housing compr...