ALEXANDRIA, Va., June 6 -- United States Patent no. 12,281,447, issued on April 22.
"Method and device for laying rail for rail transit" was invented by Jianjun Mi (Qingdao, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method and a device for laying a rail for rail transit are provided. In the present method for laying a rail for rail transit, the rail is a steel rail, which is fabricated and laid continuously on site; the on-site fabrication of the steel rail adopts at least on-site rolling; the rolling is continuous rolling; there is also a casting process before the steel rail is rolled; and the casting process is a continuous casting process. Through the continuous casting and rolling processes...