Method of producing a channeled plastic pipe with closed channel ends
US4474726A · kind A · utility
19Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1982 |
| Grant date | Oct 2, 1984 |
| Priority date | — |
| Expiry date | Mar 1, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/218
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method of producing plastic pipe having air channels axially extending through the wall thereof, with at least one of the respective ends of the air channels being closed by an annular slotted channel-closure filled with a caulking material in its annular slot. The channel-closure is force-fitted on the pipe end, so that the caulking material is pressed into the air channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.