ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,420,333, issued on Sept. 23, was assigned to ZF Friedrichshafen AG (Friedrichshafen, Germany).
"Method for producing a cylindrical hollow body made of aluminum or of an aluminum alloy or of a light metal alloy, cylindrical hollow body, and vehicle transmission" was invented by Christian Ruhl (Friedrichshafen, Germany) and Helmut Boehm (St. Ingbert, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for producing a cylindrical hollow body (20) made of aluminum, an aluminum alloy, or a light metal alloy, includes casting a hollow body (20) such that the hollow body (20) has an inner and an outer lateral surface (21, 22) and two axial end fac...