Pipe joints or couplings – Nonmetal to metal – Internal member
Reexamination Certificate
2006-06-06
2006-06-06
Dunwoody, Aaron (Department: 3679)
Pipe joints or couplings
Nonmetal to metal
Internal member
C285S382700, C285S354000, C285S903000
Reexamination Certificate
active
07055868
ABSTRACT:
A fitting for an end of a length of corrugated tubing forms a gas-tight metal-to-metal seal by rolling and folding an endmost corrugation into a axially extending annular groove in the fitting body. A ridged retainer grips the tubing corrugations above the endmost corrugation and is axially advanced into the fitting body by a nut. The cut end at the endmost corrugation of the tubing encounters the axially facing end of a tubular stub inside the fitting body and folds over itself and into the annular groove between the stub and the inside surface of the fitting body. A seal member is thus formed with a pair of substantially parallel sealing surfaces, and resides between the retainer and the outside surface of the tubular stub. The seal member forms a metal/metal seal with the tubular stub.
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Duane Morris LLP
Dunwoody Aaron
Highlands Corporation
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