ALEXANDRIA, Va., July 16 -- United States Patent no. 12,669,054, issued on June 30, was assigned to HINFRA S.R.L. (Casale Monferrato, Italy).
"Work carriage for the lining of tunnels" was invented by Stefano Guanziroli (Erba (Como), Italy) and Francesco Guanziroli (Erba (Como), Italy).
According to the abstract* released by the U.S. Patent & Trademark Office: "A work carriage running stepwise along a tunnel to lay a solidifiable fluid material on walls of the tunnel and allow it to solidify for constructing a tunnel lining is provided. The work carriage has a sliding formwork equipped with a closing board for closing, radially to the tunnel, a space between a front edge of the sliding formwork and a wall of the tunnel to be lined to form ...