Underdrain system

Liquid purification or separation – With repair or assembling means

Reexamination Certificate

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Details

C210S289000, C210S291000, C210S293000

Reexamination Certificate

active

06991723

ABSTRACT:
An underdrain system having a bottom formed of concrete. The concrete bottom includes a plurality of depressions formed therein. A porous plate is operably associated with at least one of the depressions. An anchor assembly is provided for anchoring the porous plate to the concrete bottom in an efficient and cost effective manner. Preferably, the anchor assembly permits the porous plate to be readily replaced. An optional insert may be used to enhance the distribution of the flow of fluid through the porous plate.

REFERENCES:
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patent: 541011 (1922-07-01), None
“Water Marks,” pp. 1 and 2; Jan. 1995.
“Retroliner™ Rehabilitation System for Monolithic Wheeler Underdrains Product Specifications.” pp. 1 and 2.
“Gravity Filter Underdrain,” Jan. 1981.
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Office action dated Apr. 6, 2005 issued in Ecuadorian Patent Application No. SP 02-4313.
Co-pending U.S. Appl. No. 11/119,907 filed on May 3, 2005.

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