Method of continuously producing a twin-wall pipe with a...

Details Method of continuously producing a twin-wall pipe with a... Method of continuously producing a twin-wall pipe with a...

2007-07-03

2007-07-03

Johnson, Christina (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

C264S512000, C264S514000, C264S515000, C264S566000, C264S150000, C264S167000, C264S173160, C264S505000, C138S109000, C138S120000, C138S121000, C138S137000, C138S141000, C138S148000, C138S173000, C285S374000, C285S399000, C285S903000, C285S924000

Reexamination Certificate

active

10999635

ABSTRACT:
A twin-wall pipe comprises an internal pipe and an external pipe. The external pipe is corrugated, having elevations and troughs. The twin-wall pipe is further provided with a socket. In a transition portion towards the twin-wall pipe and the socket, provision is made for at least one overflow passage which interconnects the clearance between the external pipe and internal pipe in the vicinity of the transition portion and an adjacent elevation.

REFERENCES:
patent: 4534923 (1985-08-01), Lupke
patent: 5320797 (1994-06-01), Hegler et al.
patent: 5346384 (1994-09-01), Hegler et al.
patent: 5405569 (1995-04-01), Lupke
patent: 5472659 (1995-12-01), Hegler et al.
patent: 5320797 (1997-04-01), Hegler
patent: 6045347 (2000-04-01), Hegler
patent: 6458311 (2002-10-01), Hegler
patent: 6660199 (2003-12-01), Siferd et al.
patent: 03701047.7 (2003-01-01), None
patent: 0415688.7 (2004-07-01), None
European Search Report, 0415688.7, Nov. 19, 2004.

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