ALEXANDRIA, Va., March 17 -- United States Patent no. 12,575,956, issued on March 17.
"Lifting aid and rigid back element" was invented by Dominik Heinzelmann (Freudenstadt, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A lifting aid for supporting the trunk muscles, which is arranged in a fixed position on the back of a person carrying it via an upper (wearer) and a lower body connection, having-a fixed back system with the right and left hip elements hinged thereto-at least one mechanical energy storage device which stores energy as elastic deformation and the spring elements of which are attached at one end to the lower body connection; -at least one force transmission element/tensioning device, ...