ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,747,483, issued on Sept. 29, was assigned to NIPPON STEEL Corp. (Tokyo).
"Welded rail" was invented by Masaharu Ueda (Tokyo), Kenji Saita (Tokyo), Teruhisa Miyazaki (Tokyo) and Takuya Tanahashi (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A welded rail having excellent fatigue damage resistance and breakage resistance of a welded joint portion according to an aspect of the present invention includes: a plurality of rail portions; and a welded joint portion joining the rail portions, in which a HAZ width (W) is 60 mm or less, and when an interval between a most softened portion and a welding center measured along a longitudinal direction is def...