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Class Information
Number: 210/338
Name: Liquid purification or separation > Plural distinct separators > Filters > In series for prefilt flow > Nested units > Concentric filter elements
Description: Apparatus in which the nested units are concentric filter elements.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
7247237 Fluid cleaning filter and filter device Jul. 24, 2007
7182856 Stormwater treatment train Feb. 27, 2007
7125434 Deep gradient-density filter device Oct. 24, 2006
7118673 Filter for oil containing adhesive contaminants Oct. 10, 2006
7115204 Pool pump filter Oct. 3, 2006
7087166 Filter element and filter device having replaceable filter Aug. 8, 2006
7081201 Encapsulated filter cartridge Jul. 25, 2006
6986843 Water purifier Jan. 17, 2006
6984319 Environmentally friendly acid neutralizing full flow cartridge Jan. 10, 2006
6942796 Filter device for filtering a liquid Sep. 13, 2005
6818122 Dual stage filter element bypass valve Nov. 16, 2004
6800200 Dual-flow filter cartridge Oct. 5, 2004
6790345 Underwater filtration operator Sep. 14, 2004
6712967 Liquid filter assembly with concentric filter sleeves of bag-type media Mar. 30, 2004
6682651 Barrel type fish and/or particulate screen device Jan. 27, 2004
6676834 Self-cleaning water filter Jan. 13, 2004
6666968 Fluid filtration apparatus Dec. 23, 2003
6641637 Additional flow filter Nov. 4, 2003
6596043 Air/oil separator tank with permanent drain layer Jul. 22, 2003
6569329 Personal water filter bottle system May. 27, 2003
6540914 Cleanable filter with spinning screen Apr. 1, 2003
6533941 Flow through drain filter for a stormwater or wastewater catch basin Mar. 18, 2003
6491818 Suction strainer with an internal core tube Dec. 10, 2002
6488842 Filtering device Dec. 3, 2002
6387261 Serviceable filter with bypass May. 14, 2002
6361690 Extended area filter basket assembly and filter bag therefor Mar. 26, 2002
6338797 Filter device for wastewater treatment system Jan. 15, 2002
6267875 Reusable spin-on multi system oil filter and method of reclaiming used filter canisters Jul. 31, 2001
6248236 Double pass fuel filter assembly Jun. 19, 2001
6207050 Magnetic core for an oil filter Mar. 27, 2001
6063276 Filter cartridge with drainable sludge barrier May. 16, 2000
6036850 Filtration system for zebra mussels Mar. 14, 2000
5922199 Double pass fuel filter assembly Jul. 13, 1999
5895568 Superfine oil cleaning filter Apr. 20, 1999
5888383 Fluid filter arrangement with bypass and shield for small pore size screen Mar. 30, 1999
5849186 Integrated cardiotomy and venous blood reservoir Dec. 15, 1998
5814211 Reusable spin-on multi system oil filter Sep. 29, 1998
5811002 Filter cartridge with drainable sludge barrier Sep. 22, 1998
5776336 Annular filter assembly Jul. 7, 1998
5723044 Water filtration system for control of the zebra mussel Mar. 3, 1998
5698096 Filter of a drinking water machine Dec. 16, 1997
5635064 Waste water filter Jun. 3, 1997
5607585 Apparatus for filtering plastic melts Mar. 4, 1997
5587073 End supported double drum waste water screen Dec. 24, 1996
5569373 Reusable fluid filter and adapter Oct. 29, 1996
5565097 Micro-screen filter device Oct. 15, 1996
5547570 Screening device Aug. 20, 1996
5538632 Multiple filter dynamic washer Jul. 23, 1996
5538632 Multiple filter dynamic washer Jul. 23, 1996
5536403 Liquid purification system with microfiltration means, disinfection means and adsorption means Jul. 16, 1996

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