ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,391,201, issued on Aug. 19, was assigned to Outokumpu Oyj (Helsinki).
"Expanded tube for a motor vehicle crash box and manufacturing method for it" was invented by Stefan Lindner (Willich, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a motor vehicle crash box with a working direction in vehicle's longitudinal axis manufactured out of a tube which is expanded into different zones, wherein the zones are different in strength and diameter by using steel after forming a homogenous austenitic microstructure with a strain hardening effect. The present invention further relates to the manufacturing method of such a co...