Construction of a foamed polymeric manhole chimney
US7401998B2 · kind B2 · utility
17Cited by
31References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2005 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | Oct 6, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/124
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A stackable polymeric foam adjustment or grade ring is provided for the construction of the adjustment courses or manhole chimney portion of a sewer system. The adjustment ring is circular and may include concentric annular grooves on at least one surface and male portions corresponding in size and shape to the concentric annular grooves on a second surface. The adjustment rings are stacked one on another with the respective male portions being coupled within a corresponding annular groove to provide a manhole construction that is resistant to inflow, chemicals and freeze-thaw cycle damage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.