Pipe joints or couplings – Essential catch
Reexamination Certificate
2006-09-19
2006-09-19
Dunwoody, Aaron (Department: 3679)
Pipe joints or couplings
Essential catch
C285S294100
Reexamination Certificate
active
07108295
ABSTRACT:
A filament-wound composite coupling for use in assembling a restrained joint between large diameter pipes with complementary retaining grooves, such as 16 inch or larger outer diameter polyvinyl chloride pipes. The coupling has first and second ends and ported retaining grooves associated with each end. Preferably, the coupling also includes O-ring seals and a pipe stop to index the pipes to be coupled. The composite coupling has a cylindrical composite body with a plurality of concentrically arranged layers of wound filaments in a thermoset plastic matrix. Each of the layers is characterized by a winding angle opposing the winding angle of the adjoining layers.
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Certain-Teed Corporation
Dunwoody Aaron
Elwell Robert A.
Jacobs Gregory F.
Plache Alexander H.
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