US 6,982,034 B2
Underdrain system
R. Lee Roberts, Chadds Ford, Pa. (US); and Mark Kevin Addison, Bear, Del. (US)
Assigned to RG Delaware, Inc., Wilmington, Del. (US)
Filed on Sep. 10, 2001, as Appl. No. 9/948,798.
Prior Publication US 2003/0047502 A1, Mar. 13, 2003
Int. Cl. B01D 24/22 (2006.01)
U.S. Cl. 210—232 13 Claims
OG exemplary drawing
 
1. An underdrain system, comprising:
(a) a bottom formed of concrete, said bottom having a plurality of generally cone shaped depressions formed therein;
(b) a porous plate, said porous plate being at least partially disposed within at least one of said generally cone shaped depressions, said porous plate having a first opening formed therein; and,
(c) a removable anchoring member for removably anchoring said porous plate to said bottom, said removable anchoring member extending into said first opening and into said generally cone shaped depression having said porous plate;
(d) a thimble formed in a bottom of at least one of said generally cone shaped depressions; and,
(e) said removable anchoring member includes upper and lower portions, said lower portion engages said thimble.