Nonfreezing pipe
US5014752A · kind A · utility
6Cited by
16References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1989 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Oct 19, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L59/065
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The nonfreezing pipe with a double wall construction comprises an inner shell having openings at its opposite ends, an outer shell extending axially around the inner shell to form an annular space surrounding the inner shell, and at least one end closure member connecting between one end of the outer shell and the external wall portion of the inner shell. The annular space is evacuated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.