ALEXANDRIA, Va., June 2 -- United States Patent no. 12,644,287, issued on June 2, was assigned to MACNEIL IP LLC (Bolingbrook, Ill.).
"Stair nosing" was invented by David S. Iverson (Oak Brook, Ill.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An injection molded stair nosing has a tread member, a front portion of which is downwardly and backwardly canted from the horizontal by about 5 to about 7 degrees. The front portion is supported by a plurality of spaced apart support ribs underneath the front portion. Each support rib may have a front concave surface to fit to a curved transition of a stair tread to a stair riser or nose. A back portion of the tread member is tapered to mitigate any interference wit...