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US 6,543,489 B1Granted
Unitary reduction duct
AssigneeBuilding Materials Investment Corporation
InventorsClair A. Luce, Ronald D. Shuck
Life of this patent
Estimating the term…
Abstract
A unitary annular reduction duct suitable for joining pipes comprising an annular entrance collar of a given diameter, a corrugated and gradually inwardly tapered reduction portion that is contiguous with the collar section and a corrugated and substantially vertical annular exit portion contiguous with the reduction portion whereby the reduction portion has a diameter less than the collar section. The reduction duct may also be used to join pipes of different shapes.
Claims9
A unitary annular reduction duct suitable for joining pipes of dissimilar diameter comprising:
- an annular entrance collar section of a given diameter;
- a corrugated and gradually inwardly tapered reduction portion contiguous with the collar section;
- a corrugated, substantially vertical annular exit portion contiguous with said reduction portion having a diameter less than that of said collar section.
Dependencies are inferred from the claim text.