Composite pipe having an integral bell end
US4240470A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1978 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Feb 21, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L47/08
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A composite reinforced plastic pipe having an integral bell end and method for making the same are disclosed wherein the composite pipe has a resin impregnated surfacing veil liner, a first resin impregnated continuous fiberglass strand reinforced layer coaxial along the inner liner, a sand-resin core layer formed along the cylindrical portion of the pipe but not on the bell end, a resin impregnated surfacing mat formed coaxially along the length of the exposed first fiberglass strand reinforced layer on the bell end and along the core layer, and an outer resin reinforced roving layer formed coaxially along the full length of the pipe, the composite pipe being cured to form a high strength pipe having uniform radial stiffness and improved resistance to water migration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.