ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,686, issued on Sept. 23, was assigned to Ness Inventions Inc. (St. Paul, Minn.).

"Block with curved engagement surfaces for maintaining even setback" was invented by Jeffrey Ness (St. Paul, Minn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A retaining wall block including a pair of curved engagement surfaces extending convexly from a rear side of the block and being symmetrical about a transverse axis are configured to engage a planar surface of a setback lip of similar overlying blocks when stacked in successive courses to form a wall structure, where the curved engagement surfaces maintain a desired setback distance successive courses for stra...