Portable staircase
US11591854B1 · kind B1 · utility
1Cited by
35References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 31, 2020 |
| Grant date | Feb 28, 2023 |
| Priority date | — |
| Expiry date | Dec 24, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C5/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The disclosure relates to portable staircases having a staircase assembly including an outer staircase and an inner staircase that can move in a telescoping relationship with respect to the outer staircase. Portable staircases of the disclosure are particularly useful for accessing an oil drilling rig as they are independently supported with respect to the drilling rig, thus providing numerous safety improvements and advantages. Methods of using the portable staircases of the disclosure are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.