Method of forming corrugated pipe with a pipe spigot seal seat

Details Method of forming corrugated pipe with a pipe spigot seal seat Method of forming corrugated pipe with a pipe spigot seal seat

2011-07-12

2011-07-12

Johnson, Christina (Department: 1742)

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

C264S310000, C264S322000, C264S323000, C264S506000, C264S508000, C030S095000, C425S392000, C425S402000

Reexamination Certificate

active

07976753

ABSTRACT:
A piece of corrugated pipe cut from a longer length of pipe is provided with a pipe coupling part by subjecting one or more of the corrugation crests on the pipe to heat and pressure. This reshapes the one or more corrugations to form a seal receiving recessed spigot on the piece of pipe.

REFERENCES:
patent: 4018072 (1977-04-01), Davis
patent: 4500284 (1985-02-01), Lupke
patent: 5342570 (1994-08-01), Ledoux et al.
patent: 6578882 (2003-06-01), Toliver
patent: 2005/0139569 (2005-06-01), Larsen et al.
patent: 2005/0140057 (2005-06-01), Gerndt
patent: WO 0136167 (2001-05-01), None

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