| Patents for B01D 24 - Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof (8,047) |
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| 01/07/1992 | US5078861 Water clarifying apparatus |
| 01/07/1992 | US5078859 Stock screening apparatus |
| 01/02/1992 | DE4119154A1 Device for treating wastewater, comprises sludge trap chamber for collecting sludge and solids contained in the wastewater, filter chamber for collecting floats and immiscible light liquids, inlet, outlet and coalescence filter box |
| 12/27/1991 | EP0462894A1 Device for evacuating washing water from a filter filled with granular material and washed with a water-air mixture |
| 12/26/1991 | WO1991019555A1 Water purification system with filter cleaning mechanism |
| 12/25/1991 | CN2091355U Changing thin wall engine oil filter |
| 12/25/1991 | CN1015152B Water purification device with intake-funnel |
| 12/25/1991 | CN1015151B Filter cover for purification insert in water treatment device hollow tube |
| 12/24/1991 | CA1293360C Apparatus for the treatment of a material, in particular a web of material or pulp, made to pass between at least two endless permeable belts |
| 12/21/1991 | CA2044520A1 Granular filter wash water disposal means for said filters cleaned simultancously by water and air |
| 12/19/1991 | DE4116144A1 Downwards-flow water filter with biological and mechanical filter - where upper biological layer has aeration system made up of removable horizontal pipe array which can be raised and lowered in filter tank |
| 12/18/1991 | CN2090722U 滤油器 Oil Filter |
| 12/17/1991 | CA1293185C Compound filters |
| 12/12/1991 | WO1991018658A1 Filtration apparatus and method |
| 12/05/1991 | WO1991018836A1 Improved water clarifying apparatus |
| 12/04/1991 | EP0238510B1 Water filtering system |
| 11/27/1991 | EP0458198A2 Flow through assay apparatus |
| 11/26/1991 | US5068034 Purification underdrain with means to compensate for flow and pressure differences between laterals |
| 11/26/1991 | US5068033 For use with swimming pools, water receptacles can be individually replaced without requiring removal of the udnerdrain from the filter |
| 11/26/1991 | US5068029 Two-chamber fluid/solids treatment vessel |
| 11/20/1991 | CN1056258A Artificial earth technology for fast filtering urban sewage and filter material-artificial earth |
| 11/19/1991 | US5066393 Slotted flow collector/distributor for water treatment tank with one-way valves |
| 11/19/1991 | CA1292190C Method and system for cleansing a filter bed |
| 11/12/1991 | CA1291953C Buoyant filter media |
| 10/30/1991 | EP0454392A1 Method for thickening lime sludge |
| 10/30/1991 | EP0453804A1 Filter for aquarium |
| 10/30/1991 | CN2087530U Bilateral extra quality pressure filter |
| 10/27/1991 | CA2040696A1 Filter for aquarium |
| 10/17/1991 | DE4105607A1 Drawing liq. samples from waste-water treatment plant - dividing outflow into separate sample collectors associated with compartments of tub tilted about axis |
| 10/15/1991 | US5057232 Filter element and method of filtration |
| 10/15/1991 | CA1290704C Air/water distributor underdrain |
| 10/15/1991 | CA1290703C System for removing liquid from a slurry of liquid and powdered material |
| 10/09/1991 | EP0450913A2 A vehicle for skimming a surface |
| 09/25/1991 | CN2085250U Cinder and water separator |
| 09/19/1991 | WO1991013670A1 A liquid distributor for use in granular filter beds |
| 09/18/1991 | EP0446231A1 Filtering device |
| 09/17/1991 | US5049272 Filter cartridge with vented cap |
| 09/10/1991 | US5047146 Bidirectional flow vacuum filter for a swimming pool having influent and effluent conduits as structural members |
| 09/05/1991 | WO1991012869A1 Two-chamber fluid/solids treatment vessel |
| 09/04/1991 | EP0305394B1 Arrangement for liquid treatment of pulp |
| 09/03/1991 | US5045199 Stacked filter supports with corresponding profile seals |
| 08/28/1991 | EP0443747A2 Flow collector/distributor for water treatment tank |
| 08/28/1991 | EP0193565B1 Apparatus for clarification of water |
| 08/27/1991 | CA1288059C Method and system for cleansing a filter bed |
| 08/22/1991 | DE4021350A1 Paper sorting sieve - consists of drum on horizontal axis to divide the tank into two chambers |
| 08/20/1991 | US5041223 Arrangement for an inlet pipe in a rotating drum sieve |
| 08/20/1991 | US5041219 Dual chamber water filter |
| 08/14/1991 | CN2082634U High-efficiency fully automatic pressure water cleaning device |
| 08/13/1991 | WO1991012061A1 Dual chamber water filter |
| 08/13/1991 | US5039413 Spiral wrapped fluid treatment element |
| 08/13/1991 | US5039347 Method for cleaning the filter plates of a suction drier |
| 08/08/1991 | WO1991011244A1 Plastic-jacketed filter underdrain block |
| 08/07/1991 | EP0439985A1 Process and device for filtration/flow control, especially for the treatment of swimming pool water |
| 08/07/1991 | EP0252161B1 Device for purification, particularly filtration, of a fluid or gaseous medium |
| 08/01/1991 | DE4002507A1 Assembly for removal of fine water-borne particles - from outlet pipe |
| 07/31/1991 | CN2081754U Supper-purification filter for drinking water |
| 07/30/1991 | US5035798 Filtration vessel and end cap lock by a flexible rod |
| 07/25/1991 | WO1991010624A1 System and method for treating sewage or other fluids |
| 07/25/1991 | WO1991010493A1 Multi-function filter cartridge with flow distribution control |
| 07/16/1991 | US5032294 Backwashing |
| 07/16/1991 | US5032270 Thickener |
| 07/16/1991 | US5032261 Compact biofilter for drinking water treatment |
| 07/11/1991 | WO1991009661A1 Method and device for carrying off the filter cake from a filter apparatus |
| 07/09/1991 | US5030348 Arrangement for an inlet and outlet in a rotating drum sieve |
| 07/04/1991 | DE4013080C1 Cleaning particulate filter bed - using appts. having vertical tube with filter chamber and inlet |
| 07/03/1991 | EP0278952B1 Filter arrangement |
| 07/03/1991 | CN1013024B System for removing liquid from slurry consisting of liquid and powder material |
| 07/02/1991 | US5028322 Low profile underdrain strainer assembly with improved distribution/fastening means |
| 07/02/1991 | CA1285374C Device for feeding a declogging gas to the openings of a fluidization grate |
| 06/27/1991 | WO1991008818A1 Apparatus for filtration of liquid |
| 06/27/1991 | WO1991008817A1 Treating liquids in filters |
| 06/19/1991 | EP0433028A1 Cellular filter comprising a moving back-wash system |
| 06/19/1991 | CN2079078U Continuously purifying device for circulate bed |
| 05/29/1991 | EP0428821A1 Process and installation for the filtration of suspensions, emulsions and/or cooling lubricants |
| 05/29/1991 | EP0428747A1 Method and apparatus of filtering medium circulation type for purifying contaminated water |
| 05/29/1991 | CN1051681A Hardened gum formed-in-place membranes |
| 05/28/1991 | US5019278 Continuous washed sand filter and washer |
| 05/28/1991 | US5019276 Method of and plant for purifying water |
| 05/28/1991 | US5019259 Filter underdrain apparatus with partitioned distributor conduits |
| 05/14/1991 | US5015375 Rechargeable filter assembly |
| 05/08/1991 | DE3936611A1 Domestic drinking water supplier - has filter cartridge remaining wet to resist microbial entry |
| 05/02/1991 | EP0424933A2 Filter device |
| 04/24/1991 | EP0423403A1 Solid-liquid separator and process for washing the same |
| 04/24/1991 | CN2075535U 滤水器 Water Filters |
| 04/23/1991 | US5009776 Filter system |
| 04/18/1991 | DE4031339A1 Transportable tank for treating waste water - is divided into three compartments with filters in each compartment |
| 04/16/1991 | US5008008 Universally adaptable pool water filter structure |
| 04/10/1991 | EP0421920A1 Drainage tube for backwashable drainage tube filter installation |
| 04/10/1991 | EP0421078A1 Supply device for separating machine |
| 04/10/1991 | CN1050505A Filter device |
| 04/09/1991 | US5006251 First step of upward flow solid-liquid separator; non-clogging |
| 04/09/1991 | US5006242 Mechanically secured wool filter cartridge |
| 04/09/1991 | US5006240 Water-treatment system |
| 04/03/1991 | EP0419695A1 Slurry pumping apparatus |
| 04/02/1991 | US5004049 Low profile dual screen prepack |
| 04/02/1991 | CA1282226C Apparatus or device for the treatment of a material made to pass between at least two endless permeable belts, for instance screen belts, or the like conveying means |
| 03/28/1991 | DE3931011A1 Well shaft filter cleaning for below ground filters - has tubes sunk parallel to shaft connected in pump circuit for forced cleaning with provision for adding materials to flow |
| 03/26/1991 | US5002665 Device for filtering water with filter insert |
| 03/13/1991 | EP0375739A4 Water clarification system adapted for removing particulate matter of greater than a predetermined size |
| 03/13/1991 | CN2072859U Spiral fitting oil cleaner |