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Class Information
Number: 210/274
Name: Liquid purification or separation > Particulate material type separator, e.g., ion exchange or sand bed > With rehabilitation means > Including means to apply gas to bed
Description: Apparatus comprising means to introduce gas into the separating medium.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7413649 |
Treatment apparatus with modular chemical containing units having one-way valve assemblies |
Aug. 19, 2008 |
| 7374676 |
High rate filtration system |
May. 20, 2008 |
| 7332080 |
Apparatus for salt free water softening |
Feb. 19, 2008 |
| 7288193 |
Apparatus for directing fluids through a filter system |
Oct. 30, 2007 |
| 7192521 |
Filter having a media retaining plate |
Mar. 20, 2007 |
| 7138056 |
Filter underdrain system for backwash flow and method for measuring same |
Nov. 21, 2006 |
| 7090771 |
Filtration system underdrain |
Aug. 15, 2006 |
| 7063787 |
Filter media retaining cap and hold down grid |
Jun. 20, 2006 |
| 6991726 |
Filter having a media retaining plate |
Jan. 31, 2006 |
| 6989096 |
Apparatus for directing fluids through a filter system |
Jan. 24, 2006 |
| 6942795 |
Modular filter system and method of repairing and/or replacing components thereof |
Sep. 13, 2005 |
| 6921481 |
Automatic backwash filter system |
Jul. 26, 2005 |
| 6841069 |
High rate filter and high rate filtration method using the filter |
Jan. 11, 2005 |
| 6830684 |
Integrated liquid and gas distribution device for underdrain block laterals |
Dec. 14, 2004 |
| 6797166 |
Underdrain apparatus |
Sep. 28, 2004 |
| 6790345 |
Underwater filtration operator |
Sep. 14, 2004 |
| 6790351 |
Vertical filter |
Sep. 14, 2004 |
| 6773589 |
Method and apparatus for removing particulate contaminants from commercial laundry waste water |
Aug. 10, 2004 |
| 6740237 |
Low profile extruded underdrain |
May. 25, 2004 |
| 6641737 |
Vertical filter |
Nov. 4, 2003 |
| 6569327 |
Apparatus for directing fluids through a filter system |
May. 27, 2003 |
| 6517724 |
Air charged backwashing bioclarifier |
Feb. 11, 2003 |
| 6517712 |
Descending bed filter |
Feb. 11, 2003 |
| 6471857 |
Filter apparatus with sand filter bed |
Oct. 29, 2002 |
| 6461502 |
Apparatus for recovering a specific ingredient in sea water |
Oct. 8, 2002 |
| 6423216 |
Biological oxidation filter system |
Jul. 23, 2002 |
| 6423224 |
Filter cartridge assembly for water treatment device |
Jul. 23, 2002 |
| 6387283 |
Descending bed, continuously regenerating type filter with an adjustable length wash chamber |
May. 14, 2002 |
| 6383376 |
Method and apparatus for filtering a liquid |
May. 7, 2002 |
| 6334956 |
Adsorption or desorption of dissolved constituents in liquids and apparatus therefor |
Jan. 1, 2002 |
| 6325931 |
Filtration system having a low profile extruded underdrain |
Dec. 4, 2001 |
| 6312611 |
Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes |
Nov. 6, 2001 |
| 6306310 |
Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes |
Oct. 23, 2001 |
| 6261453 |
Fluid treatment media support system |
Jul. 17, 2001 |
| 6177005 |
System for producing ultrapure water having a TOC density of no more than 0.5 ppb |
Jan. 23, 2001 |
| 6143188 |
Underdrain block for filter media system |
Nov. 7, 2000 |
| 6103109 |
Wastewater treatment system |
Aug. 15, 2000 |
| 6093329 |
Air scour/backwash apparatus for celless traveling bridge filter |
Jul. 25, 2000 |
| 6090284 |
Underdrain unit for granular filtration system |
Jul. 18, 2000 |
| 6077426 |
Filter filled with loose bulk material |
Jun. 20, 2000 |
| 6039866 |
Fluidized bed filtering apparatus |
Mar. 21, 2000 |
| 6030529 |
Biological reactor including settler assembly |
Feb. 29, 2000 |
| 6027645 |
Granular media filter including media settler assembly |
Feb. 22, 2000 |
| 6007721 |
Method and system for regulating the addition of oxygenated gas into a biofilter with rising currents |
Dec. 28, 1999 |
| 5980748 |
Method for the treatment of a liquid |
Nov. 9, 1999 |
| 5873996 |
Community drinking water purification system |
Feb. 23, 1999 |
| 5863422 |
Apparatus for carbon dioxide pretreatment and accelerated limestone dissolution for treatment of acidified water |
Jan. 26, 1999 |
| 5800710 |
Method and apparatus for the biochemical purification of a liquid medium |
Sep. 1, 1998 |
| 5792359 |
Sealing shoe for celless travelling bridge filter |
Aug. 11, 1998 |
| 5788842 |
Biomass separation apparatus and method |
Aug. 4, 1998 |
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