Ladder extension apparatus
US4143742A · kind A · utility
6Cited by
3References
4Claims
0Family size
Inventor
Key dates
| Filing date | Jul 20, 1978 |
| Grant date | Mar 13, 1979 |
| Priority date | — |
| Expiry date | Jul 20, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06C7/44
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A ladder extension device for enabling a ladder to stand upright upon uneven or inclined surfaces is disclosed which is composed of a pair of diametrically opposed side members, preferably L-shaped, connected by hinges and secured about a ladder leg by bolts or other means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.