Subsurface drainage system and drain structure therefor

Hydraulic and earth engineering – Drainage or irrigation – Porous waterway – e.g. – sand drain – etc.

Reexamination Certificate

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Details

C405S036000, C405S043000, C405S045000, C404S036000, C052S180000, C052S169500

Reexamination Certificate

active

11216846

ABSTRACT:
A subsurface drainage assembly for directing fluid drainage from a surface is disclosed. The subsurface drainage assembly includes a plurality of drain structure panels linked together in a manner that permits movement of one drain structure panel relative to the adjacent drain structure panel. The drain structure panels have a laterally extensive backing grid and a plurality of spaced apart tubular support members projecting therefrom.

REFERENCES:
patent: 1765652 (1930-06-01), Burgess
patent: 5250340 (1993-10-01), Bohnhoff
patent: 5848856 (1998-12-01), Bohnhoff
patent: 6428870 (2002-08-01), Bohnhoff
patent: 6450731 (2002-09-01), Bohnhoff
patent: 6585449 (2003-07-01), Chen
patent: 6962464 (2005-11-01), Chen
patent: 7108454 (2006-09-01), Blackwood

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