Waterproofing and breathable polyolefin roofing membrane by extrusion lamination and sequential stretching
US12409640B2 · kind B2 · utility
0Cited by
7References
22Claims
0Family size
Inventors
Key dates
| Filing date | May 4, 2023 |
| Grant date | Sep 9, 2025 |
| Priority date | — |
| Expiry date | Oct 6, 2043 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Reinforced microporous polyolefin sheets comprise one or more layers of a microporous polyolefin and a non-woven fabric at least partially embedded in the microporous polyolefin. The reinforced microporous polyolefin sheet is made in an extrusion lamination process by which a polyolefin sheet and non-woven fabric are laminated, followed by sequential cold and hot stretching steps to produce the micropores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.