Manhole
US5899629A · kind A · utility
2Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1998 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Jul 27, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D2300/0032
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A manhole embodiment that includes a metal top ring, metal removable cover, and a flexible sheet steel skirt welded to the top ring. The skirt has a stiffening and footing flange rolled laterally inwardly or outwardly from the bottom rim of the skirt to increase the manhole lateral strength and provide a footing for the very bottom of the manhole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.