Manufacture of bitumen pipes
US4339291A · kind A · utility
1Cited by
9References
28Claims
0Family size
Inventor
Key dates
| Filing date | Feb 6, 1981 |
| Grant date | Jul 13, 1982 |
| Priority date | — |
| Expiry date | Feb 6, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31815
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A reinforced bitumen pipe has an inner, strength-providing, reinforced thermosetting resin layer which is coated on its inner and outer sides with a bitumen layer. The bitumen layer on the inner side, and preferably also the bitumen layer on the outer side, is separated from the strength-providing reinforced thermosetting resin layer with the aid of an insulating glass fiber layer into which the thermosetting resin and the bitumen partially penetrate without finding their way up to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.