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US 12,623,430 B2Granted
Thermally stable multilayer pipe
AssigneeEngineered Profiles LLC
InventorsVickram Dhanapal, Brian Davis, Matthew Thomas Fenneman, Michael Kenneth Davis
Life of this patent
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Abstract
Multilayer pipe comprising at least a first layer and a second layer, wherein the first layer is comprised a first polymer have a first thermal stability, and the second layer is comprised of a second polymer having a second thermal stability that is improved relative to said first thermal stability. In one exemplary embodiment, the first layer is comprised of PVC or CPVC, and the second layer is comprised of polycarbonate.
Claims14
A pipe consisting of:
- an outermost layer of a polyvinyl chloride material;
- and
- a second layer adjoined and positioned inwardly relative to said outermost layer, said second layer selected from the group consisting of a chlorinated polyvinyl chloride material and a polycarbonate material;
- wherein neither said polyvinyl chloride material of said outermost layer nor said chlorinated polyvinyl chloride material or said polycarbonate material of said second layer are foamed;
- wherein said pipe has been extruded such that said pipe has a smooth outer surface;
- and
- wherein said pipe has improved thermal stability such that said pipe has improved resistance to a permanent property change caused solely by heat as compared to a pipe having a same shape and dimensions and comprised of only a same polyvinyl chloride material as said pipe.
4 more elements
Dependencies are inferred from the claim text.