Drainage pipe

Details Drainage pipe Drainage pipe

2007-10-02

2009-12-08

Lagman, Frederick L (Department: 3672)

Hydraulic and earth engineering

Drainage or irrigation

Porous or apertured pipe, flume, or tileway

C405S043000

Reexamination Certificate

active

07628565

ABSTRACT:
A drainage pipe to be inserted into the ground, presents a plurality of openings (5) for the passage of water, wherein each of the openings is closed by a cap (9) containing one or more holes (11) filled with water-soluble material (13), adapted to prevent the passage of debris during drilling, which the material dissolves in contact with the water in the soil. In particular, the caps have a hollow body (9) with a plurality of holes (11) in the wall for the passage of water, which the body and holes are filled with water-soluble material (13). Moreover, the caps present an undercut (12) on the end wall of the cavity, to prevent the exit of the water-soluble material (13) which fills the hollow body (9).

REFERENCES:
patent: 1750871 (1930-03-01), Wilson
patent: 2391609 (1945-12-01), Wright
patent: 3936380 (1976-02-01), Boske
patent: 4650367 (1987-03-01), Dietzler
patent: 6202750 (2001-03-01), Ohanesian
patent: 6561732 (2003-05-01), Bloomfield et al.
patent: 7258166 (2007-08-01), Russell
patent: 7455480 (2008-11-01), Melegari
patent: 2001/0042620 (2001-11-01), Ohanesian
patent: 2008/0080931 (2008-04-01), Melegari

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