ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,429,158, issued on Sept. 30, was assigned to VALLOUREC TUBE ALLOY LLC (Houston).
"High strength insulated tube" was invented by Gabriel Roussie (Meudon, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "An insulated tube including a main body and an end piece, the end piece being attached to the main body, the main body having an inner tube and an outer tube, a radial gap being arranged between the inner tube and the outer tube, one between the outer tube and the inner tube being a cold hardened steel alloy tube, said cold hardened steel alloy tube having a first threaded portion and the end piece having a second threaded portion, the first threade...