Ladder
US9663991B2 · kind B2 · utility
1Cited by
11References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2012 |
| Grant date | May 30, 2017 |
| Priority date | — |
| Expiry date | Aug 24, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/082
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A ladder including a first stringer and a second stringer spaced transverse from each other is provided. Each of the first and second stringers defines a channel and includes a plurality of crosspieces disposed in the channels of the first and second stringers. A plurality of rungs are spaced along and coupled between the first and second stringers. Each of the rungs has a horizontal portion and a vertical portion extending from the first stringer to the second stringer. A plurality of ribs are spaced along and coupled between the horizontal and vertical portions of the rungs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.