ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,886, issued on March 18, was assigned to PrimeSource Building Products Inc. (Irving, Texas).
"Floating modular stair system" was invented by Nathan Adam Williams (Spokane, Wash.), Michael Miles Mosback (Liberty Lake, Wash.) and Aleksi Wen Hai Lee (Liberty Lake, Wash.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A floating modular stair system includes a wall mounting plate that is attachable to a vertical wall, and a base mounting plate that is anchorable to a horizontal floor. A monostringer beam is attachable to the wall mounting plate and to the base mounting plate. The monostringer beam includes an integrated hook attachment for variable angl...