Flexible tubular structures
US5672398A · kind A · utility
7Cited by
1References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1994 |
| Grant date | Sep 30, 1997 |
| Priority date | — |
| Expiry date | Jun 10, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31909
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A flexible tubular structure for use in the lining of passageways and methods relating thereto are described. The tubular structure is made of a laminate which comprises a film layer, made by melting and mixing ethylene-vinyl acetate copolymer (EVA) and polyethylene, and a felt layer. In a butt join region of the structure, a felt strip and polyethylene/EVA strip are heat welded for strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.