ALEXANDRIA, Va., Aug. 5 -- United States Patent no. 12,697,785, issued on Aug. 4, was assigned to Georg Fischer Rohrleitungssysteme AG (Schaffhausen, Switzerland).
"Variable weld spacing" was invented by Edin Hasific (Schaffhausen, Switzerland), Mariano Gutierrez (Kreuzlingen, Switzerland), Benedikt Engesser (Hochemmingen, Germany), Thomas Waldraff (Bad Durrheim, Germany) and Juergen Roesch (Lenzkirch, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "Half-shell for the receiving and concentric guidance of a plastic pipe in a butt welding machine, wherein the half-shell has a semi-circular shape with an internal diameter corresponding to the external diameter of the pipe to be received, at least one ext...