Application

17613060 · Construction method for upright lifting of large-tonnage box girder to bridge, and erection method for large-tonnage box girder

Filed 2021-11-20 · Granted · Patent 11391004 (2022-07-19) The official file ↗The patent and its PDF ↗ · Art unit 3671 · Examiner Raymond W Addie Easy · CPC E01D 21/06 · XINYUN ENGINEERING COMPANY OF CHINA RAILWAY NO. 2 ENGINEERING GROUP CO., LTD. · CENTRAL CALIFORNIA IP GROUP, P.C.