ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,491, issued on April 15, was assigned to Shanhai Jiao Tong University (Shanghai).

"Device for measuring diameter error of roller for threaded pair transmission" was invented by Yi Cui (Shanghai), Mingcai Xing (Shanghai), Shuo Liu (Shanghai), Yan Fu (Shanghai) and Meng Zhang (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "A device for measuring a diameter error of a roller for threaded pair transmission in the technical field of power machinery, comprising a roller fixing device, a laser measuring device, a screw driving device, and a roller to be measured. The roller fixing device comprises a fixing rod, a supporting structure, guide rails, ...