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| Number | Title | Issue Date |
| 8052871 | Underdrain system An underdrain system for a filter having filter media. The underdrain system preferably includes a bottom formed of concrete having a plurality of generally cone-shaped depressions formed therein. Fluid flows through the plurality of generally cone-shaped depression... | 11/08/2011 |
| 7481930 | Filter having a filter layer that forms a protective barrier to prevent clogging of a gravel-less underdrain and method of making the same A filter having a gravel-less underdrain and a filter layer installed directly on top of the gravel-less underdrain. The filter layer is designed such that when fluid is directed through the filter layer at controlled rates a protective barrier is formed by the larg... | 01/27/2009 |
| 7303683 | Microorganism-removing filter medium having high isoelectric material and low melt index binder A filter medium capable of removing microorganisms from a fluid such as water. The filter medium includes particles of activated carbon, particles of a substantially insoluble inorganic material having an isoelectric point greater than the fluid being filtered. A lo... | 12/04/2007 |
| 7303665 | Aquarium drainage and waste detection system An aquarium drainage system having a filter, funnel, clear tube, sensor housing, light sensor, light beam generator, waste indicator light, primary valve, secondary/safety valve, safety cap and safety switch, as well as the other components shown in the drawings, wh... | 12/04/2007 |
| 7288194 | Underdrain system 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... | 10/30/2007 |
| 7288193 | Apparatus for directing fluids through a filter system A fluid distribution system for directing fluids through a filter system. The fluid distribution system ensures proper distribution of fluids during the process of filtering as well as the process of washing a filter bed. The fluid distribution system may be used wi... | 10/30/2007 |
| 7192521 | Filter having a media retaining plate A filtration system that includes a plurality of underdrain blocks arranged to define a plurality of laterals. Each underdrain block defines an interior and an exterior and has an orifice that provides fluid communication between the exterior and the interior. The s... | 03/20/2007 |
| 7160452 | Filter device A filtration device that enables efficient cleansing and rinsing of filtration media within a short time, in which filtration sand is not likely to become clogged, and in which unevenness within filtration sand is not likely to occur comprising a screw conveyor 3... | 01/09/2007 |
| 7141164 | Snap locking underdrain block An underdrain block for a filter system comprises a housing that has of a top wall, a bottom wall, a first end wall, a second end wall, a first side wall, and a second side wall. The end walls and the side walls connect the top wall to the bottom wall. The bottom wa... | 11/28/2006 |
| 7138056 | Filter underdrain system for backwash flow and method for measuring same A filter underdrain system and a method for measuring the water flow through the underdrain filter system. The apparatus includes panel members assembled to form a perforate grid on the filter base structure of an underdrain block. The panels are generally rectangul... | 11/21/2006 |
| 7090771 | Filtration system underdrain The invention is directed to a filter underdrain for supporting a filter media between at least two dividers forming at least one cell, which includes at least one porous plate for supporting the filter media for filtering a fluid, the porous plate spanning across a... | 08/15/2006 |
| 7083515 | Clean room facility and construction method A vibration-inhibiting flooring structure for use in a facility housing vibration sensitive equipment includes a perforated bearing floor which includes a number of openings configured to inhibit the propagation of vibrations across the floor. Such a flooring struct... | 08/01/2006 |
| 7074329 | Lid for an underdrain block A lid for an underdrain block that has a top surface defining an opening for receiving fill material. The top surface forms a ridge circumscribing the opening, the lid comprising a top, a bottom and a peripheral edge, the peripheral edge comprising a rim adapted to ... | 07/11/2006 |
| 7063787 | Filter media retaining cap and hold down grid The invention recites a filtration tank including a chamber for holding liquid to be filtered, the filtration tank includes a fluid inlet for providing liquid to the chamber. The filtration tank further includes a fluid outlet and at least one filter block disposed ... | 06/20/2006 |
| 7001521 | Distributing or collecting device The present invention relates to a fluid distributing device for distributing fluid into a column and to a fluid collecting device for collecting fluid from a column. The invention relates also to methods of using the devices of the present invention. The distributi... | 02/21/2006 |
| 6998046 | Filter system and methods of operating the same A filter system employing a modular filter and at least one high rate pre-treatment system for expeditiously and effectively filtering water. The modular filter includes a reservoir housing for containing fluid. A plurality of filter cells are disposed in the reserv... | 02/14/2006 |
| 6991723 | Underdrain system 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... | 01/31/2006 |
| 6991726 | Filter having a media retaining plate The invention recites a filtration system including a block including a first wall and a second wall substantially parallel to the first wall. A top surface that is substantially perpendicular to the first wall is disposed between, and coupled to, the first and seco... | 01/31/2006 |
| 6989096 | Apparatus for directing fluids through a filter system A fluid distribution system for directing fluids through a filter system. The fluid distribution system ensures proper distribution of fluids during the process of filtering as well as the process of washing a filter bed. The fluid distribution system may be used wi... | 01/24/2006 |
| 6982034 | Underdrain system An underdrain system having a bottom formed of concrete. The concrete bottom includes a plurality of generally cone shaped depressions formed therein. A porous plate is operably associated with at least one of the generally cone shaped depressions. The underdrain sy... | 01/03/2006 |
| 6921481 | Automatic backwash filter system The invention is directed to an automatic backwash filter system that includes at least one influent port for introducing a fluid to the filter; a plurality of partitions forming a plurality of compartments for holding a filtering media for filtering the fluid; at l... | 07/26/2005 |
| 6841069 | High rate filter and high rate filtration method using the filter The present invention relates to the raw water-filtering technical field, and is to provide a high speed filtering apparatus which can filter a great amount of raw water containing suspended substances (SS) at a high concentration at a high speed. Floating filter me... | 01/11/2005 |
| 6830684 | Integrated liquid and gas distribution device for underdrain block laterals The invention recites a filter comprising a block including an outer wall defining an inner chamber and a block exterior, and a conduit having a conduit wall, a first conduit end, a second conduit end, and an inner flow path providing fluid communication between the... | 12/14/2004 |
| 6797166 | Underdrain apparatus A filter underdrain apparatus and a method for manufacturing such apparatus. The apparatus includes a cover member, a water orifice member and a bottom member, each being individual pieces. The cover is placed over the water orifice member and connected thereto by w... | 09/28/2004 |
| 6790357 | Media bed support grid A media bed support grid for use with a vessel having an inner surface. The media bed support grid comprises a plurality of filter panels, each filter panel having a plurality of parallel and spaced-apart filter wires, the plurality of filter wires forming a filteri... | 09/14/2004 |
| 6773589 | Method and apparatus for removing particulate contaminants from commercial laundry waste water A filtration apparatus includes a tank having an upper chamber and a lower baffle, layers of stone and carbon between the upper chamber and the lower baffle, a water inlet to the upper chamber, and a water outlet below the lower baffle. The upper chamber is divided ... | 08/10/2004 |
| 6740237 | Low profile extruded underdrain An improved underdrain block for an underdrain system supporting a filter media bed in a liquid filtration system is provided. The underdrain blocks are preferably made of an extrudable polymeric material that is extruded in relatively long sections to provide light... | 05/25/2004 |
| 6733670 | Apparatus and method for rehabilitating a traveling bridge filter underdrain A porous media support plate module may be used to construct a new filter underdrain or to rehabilitate an existing filter underdrain. A porous plate replacement module may be inserted between two existing cell dividers to replace a damaged porous media support plat... | 05/11/2004 |
| 6616832 | Multi-layer recirculating filter wastewater treatment apparatus A wastewater treatment unit (10) including a recirculation chamber (32), a dosing chamber (34) having no direct fluid connection to the recirculation chamber (32), and at least two filter layers (28, 30) in a single tank (12). Each filter layer (28, 30) c... | 09/09/2003 |
| 6615469 | Method for retrofitting an underdrain An apparatus for retrofitting a water filtration underdrain and a method therefor are provided. The apparatus comprises a nozzle for uniform water distribution through the filtration media, a conduit to provide fluid flow communication between the nozzle ... | 09/09/2003 |
| 6569327 | Apparatus for directing fluids through a filter system A fluid distribution system for directing fluids through a filter system. The fluid distribution system ensures proper distribution of fluids during the process of filtering as well as the process of washing a filter bed. The fluid distribution system may... | 05/27/2003 |
| 6569328 | Underdrain filtration system with stamped perforations An underdrain filtration system has improved perforation structure, the perforations being positioned to admit the filtrate into a plenum defined by elongated underdrain rib structures of the system. Instead of drilled or laser-cut holes or slits, the sli... | 05/27/2003 |
| 6550264 | Air conditioner discharge water saver system A gravity-assisted water saving system, and a method for its use, that can be utilized to collect the condensate from an air conditioning system, sanitize it, and then divert it for constructive use. It has a chamber with an inclined bottom surface, a dim... | 04/22/2003 |
| 6325931 | Filtration system having a low profile extruded underdrain An improved underdrain block for an underdrain system supporting a filter media bed in a liquid filtration system is provided. The underdrain blocks are preferably made of an extrudable polymeric material that is extruded in relatively long sections to pr... | 12/04/2001 |
| 6315897 | Rain water run-off filtering system A rain water run-off filtering system includes a tank for holding and filtering run-off water, said tank being generally cylindrical with a horizontal axis, and having at least one manway for the introduction of water and a filter media. A horizontal grat... | 11/13/2001 |
| 6312611 | Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes A concurrent backwash distribution apparatus for a filter having a filter tank and a plurality of underdrain laterals includes a baffle positioned in a common main conduit to define an auxiliary flume between the baffle and the underdrain laterals. The au... | 11/06/2001 |
| 6312592 | Clarifier for liquids laden with suspended matter Clarifier for liquids laden with suspended matter, comprising: an outer, first, cylindrical tank (4), a central, second, cylindrical tank (1) for collecting the filtered liquid, roughly coaxial with the first; an intermediate tank (2), formed between the outer tank... | 11/06/2001 |
| 6306310 | Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes A concurrent backwash distribution apparatus for a filter having a filter tank and a plurality of underdrain laterals includes a baffle positioned in a common main conduit to define an auxiliary flume between the baffle and the underdrain laterals. The au... | 10/23/2001 |
| 6261453 | Fluid treatment media support system A filter media support system that reduces media clogging and head loss in granular filtration systems by providing a layered porous plate. The porous plate can have multiple layers of fine sized and coarse sized pores. The porous plate is positioned betw... | 07/17/2001 |
| 6190568 | Method for retrofitting a false bottom underdrain filter system A method for retrofitting a gravity filter with a porous plate filter media support that increase filter production by increasing the depth of the media, allows installation of an air backwash system in filters having a monolithic underdrain system, and r... | 02/20/2001 |
