Embankment stairway
US6527081B1 · kind B1 · utility
14Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 30, 2001 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | May 30, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04F2011/1821
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A portable embankment stairway with steps that can be adjusted for the slope of the section of the embankment on which it is temporarily installed to provide level footing for workmen on the stairway.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.