ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,559,951, issued on Feb. 24, was assigned to RAIMONDI S.P.A. (Modena, Italy).
"Levelling spacer system" was invented by Riccardo Sighinolfi (Rubiera, Italy).
According to the abstract* released by the U.S. Patent & Trademark Office: "A levelling spacer system for laying tiles for coating surfaces, including a block equipped with a base positionable posteriorly to a laying surface of at least two adjacent tiles and flanked with respect to a flanking direction, and a separating element rising from the base at right angles thereto capable of being inserted between side walls facing said two flanked tiles, the separating element including a through window, a shaped edge of which is placed...