Gasket-less vent pipe coupling
US8505981B2 · kind B2 · utility
1Cited by
33References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 1, 2007 |
| Grant date | Aug 13, 2013 |
| Priority date | — |
| Expiry date | Jul 27, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23J2213/202
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A coupling feature for double-walled pipes. A double-walled vent pipe section has an outer wall with corresponding male and female coupling features formed on opposite ends thereof. The inner wall of the double-walled pipe section has a small ridge formed around the circumference of one end. When pipe sections are coupled together, the male and female coupling features on the outer walls engage, and the ridge on the inner wall of one pipe section engages with the bare inner wall of the other pipe section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.