Liner
US6195944A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 2, 1998 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Jun 2, 2018 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02D29/125
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A liner for a manhole, inspection chamber or the like comprises one or more sections moulded from synthetic plastics material. The or each section comprises inner and outer skins (2,3) joined together by two series of webs (4,7) extending between and at right angles to the skins (2,3). The webs (4) are disposed at the upper edges (5,6,) of the section and the webs (7) extend between a position below those upper edges (5,6) and a position at its lower end. The upper edges (5,6) and lower periphery (9) of each section are formed so that superposed sections interlock. The arrangement provides an easily installable corrosion resistant load bearing yet light, rigid and deformation resisting structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.