Rehabilitation of water supply pipes
US6857451B1 · kind B1 · utility
6Cited by
16References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 2003 |
| Grant date | Feb 22, 2005 |
| Priority date | — |
| Expiry date | Oct 1, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2023/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A water supply pipe has a tubular liner of a polyolefin elastomer/plastomer installed therein. To install it, a messenger pig is attached to a line that pulls the liner through the pipe. The liner is produced by extrusion and die drawing during extrusion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.