Back to results
US 4,248,020 AGranted
Precast concrete stairway module
AssigneeCanadian Patents and Development Limited
InventorsZenon A. Zielinski, Czeslawa Zielinski
Life of this patent
Estimating the term…
Abstract
A precast concrete stairway module comprising a concrete wall assembly which is C-shaped in plan view, providing a side wall and two end walls, a concrete stair flight extending from an edge of one side wall to a mid-height position of the other side wall. The stair flight assembly is moulded integrally with the wall assembly and comprises a landing at each end and a flight of stairs therebetween. An access opening is provided in the wall assembly.
Claims4
A precast concrete stairway module, comprising:
- (a) a concrete wall assembly having an access opening and which is C-shaped in plan view to provide a side wall and two end wall portions, and
- (b) a concrete stair flight assembly within the wall assembly and extending from a marginal edge portion of a first one of the end wall portions, along an inner side of the side wall, to a mid-height portion of a second one of the end wall portions, the stair flight assembly being moulded integrally with the wall assembly and comprising a landing at each end with a flight of stairs extending therebetween.
Dependencies are inferred from the claim text.