Twin-wall pipe with a ventilation zone between a socket and...

Details Twin-wall pipe with a ventilation zone between a socket and... Twin-wall pipe with a ventilation zone between a socket and...

2007-05-22

2009-10-13

Dunwoody, Aaron M (Department: 3679)

Pipe joints or couplings

Socket

C285S903000

Reexamination Certificate

active

07600793

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
patent: 5405569 (1995-04-01), Lupke
patent: 6458311 (2002-10-01), Hegler
patent: 2003/0090112 (2003-05-01), Baughman et al.
patent: 2005/0161947 (2005-07-01), Skinner et al.
patent: 03701047.7 (2003-01-01), None
patent: 0415688.7 (2004-07-01), None
patent: 0415688.7 (2004-11-01), None
Citations of Prior References from U.S. Appl. No. 10/999,635.

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