Double wall helical pipe and strip configuration for forming same
US4129152A · kind A · utility
26Cited by
9References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1974 |
| Grant date | Dec 12, 1978 |
| Priority date | — |
| Expiry date | Oct 21, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49828
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Double wall helical pipe formed from a single metal strip, pipe forming method and configuration of strip for forming such pipe. A metal strip is formed with pipe seam elements and curled into overlapped helical convolutions, and the seam elements are secured together to provide a helical pipe seam. One or both pipe walls may be corrugated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.