Gasket-less vent pipe coupling
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United States of America Patent
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Aug 13, 2013
Issued Date -
N/A
app pub date -
May 1, 2007
filing date -
May 2, 2006
priority date (Note) -
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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.
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