Free venting pipe and method of manufacture
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United States of America Patent
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May 6, 2014
Grant Date -
Jun 19, 2008
app pub date -
Dec 18, 2006
filing date -
Dec 18, 2006
priority date (Note) -
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Abstract
A free venting pipe and method of forming same, comprising a permeable tubular core member with at least one permeable hoop reinforcement layer around the core member; a substantially non-permeable membrane layer positioned outside of the hoop reinforcement layer and at least one permeable tensile reinforcement layer positioned outside of the membrane layer whereby a free volume annulus does not exist between any of the layers of the free venting pipe. The hoop and tensile reinforcement layers are comprised of a laminate construction.
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