Method of creating a watertight basement stairway simultaneously with forming a building foundation
US6959521B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Feb 28, 2003 |
| Grant date | Nov 1, 2005 |
| Priority date | — |
| Expiry date | Feb 28, 2023 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F11/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A concrete basement stairway is created, by positioning a stairway form 1 between a first pair of concrete receiving foundation channels 9 and a second pair of concrete receiving foundation channels 9a of any size foundation, the stairway form including a single piece stairstep panel 2, coupled by pivotable latching members, between a pair of parallel inner stairway side panels 6 and 6a, the inner stairway side panels configured to permit concrete to flow between the two pairs of concrete receiving foundation channels and spaces beneath the stairstep panel, in a manner forming a series of solidified concrete steps unified, and thus leak proof, with concrete solidified within the concrete receiving foundation channels. The stairway is formed simultaneously with the foundation so that a builder can complete the job without awaiting shipment of a pre-cast stairway requiring returning to the site. Reusable lightweight aluminum forms are employed for easy handling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.