ALEXANDRIA, Va., April 9 -- United States Patent no. 12,270,157, issued on April 8, was assigned to VOSSLOH COGIFER (Rueilfr Malmaison, France).
"Frog for switches and crossings" was invented by Francesco Barresi (Strasbourg, France) and Sylvain Schmitt (Schoenenbourg, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for assembling at least one rolling support and guide element with a complementary part by direct flash welding includes the step of a first step carried out by a first flashing phase intended to increase the temperature of the surfaces to be welded in a homogeneous manner, the duration of this first step being between 15 s and 40 s. A second step is carried out by a phase of prehe...