US 12,252,886 B2
Floating modular stair system
Nathan Adam Williams, Spokane, WA (US); Michael Miles Mosback, Liberty Lake, WA (US); and Aleksi Wen Hai Lee, Liberty Lake, WA (US)
Assigned to PrimeSource Building Products, Inc., Irving, TX (US)
Filed by CityPost, LLC, Liberty Lake, WA (US)
Filed on Oct. 4, 2021, as Appl. No. 17/493,531.
Claims priority of provisional application 63/183,390, filed on May 3, 2021.
Prior Publication US 2022/0349185 A1, Nov. 3, 2022
Int. Cl. E04F 11/00 (2006.01); E04B 1/38 (2006.01); E04F 11/028 (2006.01); E04F 11/104 (2006.01); E04F 11/02 (2006.01)
CPC E04F 11/1041 (2013.01) [E04B 1/388 (2023.08); E04F 11/028 (2013.01); E04B 2001/389 (2023.08); E04F 2011/0209 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A floating modular stair system, comprising:
a wall mounting plate attachable to a vertical wall;
a base mounting plate anchorable to a horizontal floor;
a monostringer beam attachable to the wall mounting plate and to the base mounting plate, the monostringer beam including an integrated hook attachment configured for variable angle adjustment and attachment to the wall mounting plate; and
stair tread brackets attachable to the monostringer beam for equal spacing of stair treads after installation of the monostringer beam to the wall mounting plate and to the base mounting plate.