Patent · US Expired

Polyethylene pipe

US6904940B2 · kind B2 · utility

3Cited by

4References

10Claims

0Family size

Assignee

Solvay Polyolefins Europe-Belgium S.A. · BE

Inventors

André Scheelen · Brussels, BE
Eric Vandevijver · Woluwe-Saint-Lambert - Sint-Lambrechts-Woluwe, BE

Key dates

Filing date	Oct 16, 2001
Grant date	Jun 14, 2005
Priority date	—
Expiry date	Mar 16, 2022

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/1393
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

Multi-layered pipe comprising a main layer of polyethylene compound having a resistance to stress cracking NPT measured according to ISO 13479 standard of less than 8000 hours and an internal layer of polyethylene compound having a resistance to stress cracking NPT of higher than 8000 hours, the thickness of the internal layer being between 1 and 25% of the total pipe thickness but not less than 0.3 mm.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.