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| Number | Title | Issue Date |
| 7294257 | Water filter A filter unit for filtering particulates and other foreign matter from a water supply, comprising a filtering chamber. At least a portion of an exterior of the filtering chamber being provided with filtering chamber in use. The mesh being sized to filter particulate... | 11/13/2007 |
| 7282075 | Z-filter media with reverse-flow cleaning systems and methods A method for cleaning a filter having Z-media includes providing a filter having Z-media and cleaning the media construction by directing a pulse of compressed gas into the media construction through the downstream flow face. Filter elements useable with such method... | 10/16/2007 |
| 7282147 | Cleaning hollow core membrane fibers using vibration A filtration system is provided with hollow membrane filter elements operable to remove solids, particulate and colloidal matter from a process fluid. Acoustic, vibration and ultrasonic energy may be used to clean exterior portions of the hollow membrane filter elem... | 10/16/2007 |
| 7261127 | Modified push-pull valve for filter systems and method A valve assembly is constructed for use in a filtering system including a pump and a filter with an inlet and an outlet, for example those systems used in conjunction with swimming pools. The assembly includes a valve body with a pump inlet, a filtered output, a was... | 08/28/2007 |
| 7232482 | Method for making a road base material using treated oil and gas waste material The present invention provides a novel method to produce grade road base material using recycled oilfield waste, called “oil and gas waste,” and aggregate waste and a novel road base material. Hydration and mixing of the waste materials along with a binder, will... | 06/19/2007 |
| 7081207 | Method for cleaning a filter element in a filtering chamber and filter carrying out the method The invention relates to a method for cleaning a filter element (9) located in a filtering chamber (10, 11) and to a filter implementing the method. The filter includes an inlet (4) leading to the inlet side (10) of the filtering chamber,... | 07/25/2006 |
| 7018547 | Filtration covering apparatus A filtration covering apparatus for use covering diatomaceous earth filter grids for swimming pools. The filtration covering apparatus has a replaceable cover having two closed sides, a bottom opening, and a top opening. The replaceable cover is curved shaped to acc... | 03/28/2006 |
| 7001505 | Slurry monitoring system A slurry monitoring system is provided. A filter encompasses a filter chamber containing a purge piston. During a monitor operation, the purge piston is retracted, and slurry enters the filter chamber through the filter, then passes into an outlet pipe, where a char... | 02/21/2006 |
| 6899742 | Cleaning arrangement for a suspended particle filter In a cleaning arrangement for a filter element disposed in a gas flow channel and including a plurality of filter pockets, a flow blocking element arranged adjacent the filter element at the downstream side thereof and having openings movable with the flow blocking ... | 05/31/2005 |
| 6799687 | System and method for linear object reallocation in place A backflush filter device for filter elements (22) is incorporated in a filter housing (10)having a filter inlet (18) and an outlet (20) for the liquid to be filtered. The filter elements (22) permit flow in both directions for a f... | 10/05/2004 |
| 6562246 | Pressurized backflush system A filter backflushing system including an accumulator containing a pressurized bladder which propels a supply of backwash fluid contained within the accumulator in a reverse direction through a filter element. While the backwash fluid is pumped within the... | 05/13/2003 |
| 6558545 | System for cross-flow permeation by means of a membrane The invention encompasses a system for the cross flow filtration of fluid media using membranes. The system has in a first embodiment two shafts, only one of which is hollow, with each shaft running through an axis of its given disc. The disc of each shaf... | 05/06/2003 |
| 6558443 | Method and arrangement for cleaning filters In a method and apparatus for cleaning filters in which raw gas with particles suspended therein is conducted from a raw gas space to a clean gas space and through which intermittently a back-flushing gas is conducted from the clean gas space to the raw g... | 05/06/2003 |
| 6543624 | Back-washable filter for liquids The aim of the invention is to improve the backwashing action of a backwashable filter for liquids comprising the following: a filter body which is located in a housing and which separates an incoming flow chamber from an outgoing flow chamber and a backw... | 04/08/2003 |
| 6475397 | Method and means for filter back flushing A back-flushing method is practiced with a back-flushing filter construction wherein a perforate filter screen providing filter openings also forms an internal chamber for receiving the effluent from a liquid stream. A filter piston is disposed in the int... | 11/05/2002 |
| 6439273 | Method and apparatus for cleaning filter candles in a candle filter A method and apparatus for cleaning candles in a candle filter using a cleaning fluid that flows inside the candle from the side of the filtrate, whereby said fluid is pressed in an opposite direction to the direction of the filtrate from the inside to th... | 08/27/2002 |
| 6419094 | Fixed sequential sprayer for a cylindrical wastewater screen An apparatus for cleaning a rotating cylindrical wastewater screen of the type formed of tubular perforate wedgewire. The apparatus includes a frame, a rotatable cylindrical screen carried by the frame and having an axis of rotation and which is defined b... | 07/16/2002 |
| 6325922 | Filter device for cleaning plastics melts A filter device for filtering plastic melts includes a filter wheel having cavities which are covered by screening elements. A pressure sensor is provided in a melt inflow line upstream of the filter wheel. A pressure sensor is also provided in a melt out... | 12/04/2001 |
| 6196395 | Filter device and method of operating same An external regeneration mechanism including a housing having two chambers and a displaceable member disposed between said two chambers and at least two passages are defined on said housing. The first passage is communicating with the first chamber and th... | 03/06/2001 |
| 6126819 | Apparatus for the treatment of liquids contaminated by foreign substances In an apparatus for the treatment of liquids including foreign substances, particularly municipal and commercial waste waters, comprising a membrane separating structure having membrane elements, an inlet for receiving the liquid to be separated and passi... | 10/03/2000 |
| 5958243 | Apparatus and method for membrane filtration with enhanced net flux A membrane filtration system which uses pump speed controllers to control flow rate and pressure during both the filtration cycle and the backwash cycle. The pump speed controllers operate by changing the frequency of AC current delivered to the pump moto... | 09/28/1999 |
| 5919376 | Filtration apparatus and method An improved filtration system comprises a vessel divided into a concentrate chamber and a permeate chamber by a permeable septum. An ultrasonic wave generator is mounted to the vessel and positioned to direct ultrasonic waves through both the permeate con... | 07/06/1999 |
| 5906751 | Filtering apparatus with improved quick-opening backwash valve A filtering apparatus is provided wherein the filter can be backwashed by an explosive-like surge of backwashing fluid. The backwashing assembly includes a quick-opening backwash valve which is not actuated by a linearly-acting valve stem disposed on the ... | 05/25/1999 |
| 5893973 | High efficiency backflush system for a filter A high efficiency backflush filter apparatus positioned on the downstream side of a filter frame that includes a bellows attached to the top of the filter frame. The backflush filter apparatus includes a collapsible bellows member having a first opening a... | 04/13/1999 |
| 5882528 | Method for extending useful life of filter aid in a filter with hydraulically deformable system A device for filtering fluid includes a hollow housing having a fluid inlet and a fluid outlet. A filter element formed of fluid permeable material is disposed within the housing for filtering fluid entering the fluid inlets, the fluid passing through the... | 03/16/1999 |
| 5871641 | Fluid filter with pleated septum A device for filtering fluid includes a hollow housing (10) having a fluid inlet (26) and a fluid outlet (28). A filter element (50) formed of fluid permeable material is disposed within the housing (10) for filtering fluid entering the fluid inlet (26), ... | 02/16/1999 |
| 5846420 | Filter backflushing system using piston arrangement with connected chambers The piston arrangement includes one or more pistons, each propelled by a pneumatic actuator. Alternately, an accumulator-type actuator may be used, wherein compressed gas is inputted directly into the backflushing fluid chamber to reverse fluid flow throu... | 12/08/1998 |
| 5723051 | Gap filter for liquids or gases A gap filter for liquids of gases which has a filter body 13 which encloses a clean space within a filter housing and separates it from a dirt space. The filter body 13 is supported by an element which is constructed as a safety filter 14.... | 03/03/1998 |
| 5653889 | Process for filtering polyamide oligomers from aqueous streams containing the same A filter element surface is coated with particulate polyamide which serves as a filter aid to trap polyamide oligomers suspended in water. The particulate polyamide is preferably coated onto a surface of a bag filter so that polyamide oligomers flowing th... | 08/05/1997 |
| 5609172 | Washing water filtering apparatus for dish washing machine An improved washing water filtering apparatus for a dish washing machine capable of preventing nets of a washing water filter from being clogged by wastes, so that it is not necessary to clean the nets of a washing water filter after using the dish washin... | 03/11/1997 |
| 5591329 | Fluid filter with pleated septum A device for filtering fluid includes a hollow housing having a fluid inlet and a fluid outlet. A filter element formed of fluid permeable material is disposed within the housing for filtering fluid entering the fluid inlet, the fluid passing through the ... | 01/07/1997 |
| 5578207 | Filter device for extruders having a screen plunger with longitudinally arranged candle filters The invention relates to a filter device for extruders and injection-molding machines, the screen elements being formed by a candle filter and, if required, by a plurality of candle filters, which are arranged in the circumferential direction on the scree... | 11/26/1996 |
| 5512167 | Backpulse piston assembly for crossflow filters A filtration system including a crossflow filter having an interior membrane and a backpulse piston-and-cylinder assembly having a first port connected to a permeate outlet of the crossflow filter and a second port positioned at a different location than ... | 04/30/1996 |
| 5453194 | Back-flushing filter device for the filtration of highly viscous liquids Back-flushing filter device for the filtration of a highly viscous liquid with a housing (1) which has an inlet port (2) for the liquid to be filtered, a filter (3) and an outlet port (4) for filtrate, characterised in that, the filter (3) contacts, on it... | 09/26/1995 |
| 5443737 | Rotary drum with radial spray jets A separation device for suspensions comprises a housing (1), a filter body (3) with a wall of filter material situated in the housing, spray means (14) adapted to spray jets of a suspension to be separated directly onto one side of the wall of filter mate... | 08/22/1995 |
| 5374351 | Filter backflushing system A filter backflushing system including either a pneumatically-driven piston or pneumatic accumulator for propelling a supply of a filtered backflushing fluid, contained in a backflushing fluid chamber, in a reverse direction through a filter element. The ... | 12/20/1994 |
| 5244585 | Method of cleaning porous ceramic filters The method of cleaning porous ceramic filters with a backwashing apparatus comprising an accelerating circulation path and a unit for mixing accelerated water with high-pressure air can be implemented with compact equipment to achieve efficient cleaning. ... | 09/14/1993 |
| 5215656 | Rotary self-cleaning strainer A strainer that is used in association with a motor-driven pump that sucks water out of outdoor pits, reservoirs, streams, ponds, and the like, usually for irrigation or watering purposes. The strainer has a cylindrical screen disposed on a spool-like bod... | 06/01/1993 |
| 5213687 | Apparatus for filtering mineral slurries An apparatus for filtering slurries of minerals or other fine particles is disclosed. The apparatus includes a ceramic filter plate and a fluid flow device for drawing a partial vacuum across said filter plate and to supply a pulsed liquid to the filtrate... | 05/25/1993 |
| 5160428 | Continuous filter press The device is the dual functional filter of the slurry, scraping of the filtered cake, compression the scraped cake and discharging the compressed cake, continuously. The device is composed of both the filter part and the cake compression part. While the ... | 11/03/1992 |
