| 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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| 03/12/1991 | CA1281296C Filtering system |
| 02/26/1991 | US4995990 Air and water distribution conduit |
| 02/26/1991 | US4995988 Method and apparatus for thickening a slurry using a compression plate |
| 02/26/1991 | US4995973 Modular longitudinal spray finisher |
| 02/20/1991 | EP0413178A2 Device for mechanical purification of biologically treated waste water |
| 02/20/1991 | CN2071536U Non-backflush continuous filtrating tower type water purifier |
| 02/17/1991 | CA2023302A1 Apparatus for mechanical purification of liquids |
| 02/12/1991 | US4992167 Filtering apparatus |
| 02/06/1991 | CN2070734U High efficient combined water cleaner |
| 02/02/1991 | CA2022401A1 Gravity feed batch filter water purification cartridge having multiple beds |
| 01/30/1991 | CN2070514U Magnetic driven water filter |
| 01/29/1991 | US4988439 Two stage traveling bridge filter |
| 01/22/1991 | US4986913 Coarse to progressively finer filter layers |
| 01/09/1991 | EP0406424A1 Process for recovering crystals from slurry |
| 01/08/1991 | US4983308 Monitoring draindown time |
| 01/02/1991 | EP0405562A2 Method for cleaning the filter plates of a suction drier |
| 12/27/1990 | EP0404573A2 Water dispenser |
| 12/22/1990 | CA2019706A1 Filter and apparatus using filter |
| 12/18/1990 | US4978444 Water purifier for aquariums |
| 12/11/1990 | US4976873 Pulsing portions of a filter cell to extend a filter run |
| 12/05/1990 | EP0400096A1 Filter element and filtration process. |
| 12/05/1990 | CN1047483A Filtering material circulating-type process for purification of sewage, and apparatus therefor |
| 11/29/1990 | DE3915958A1 Appts. for filtering liquids - by flowing upwards through moving particulate filter bed, then re-directed to parallel filter when certain differential pressure is reached |
| 11/27/1990 | WO1990014313A1 Method and apparatus of filtering medium circulation type for purifying contaminated water |
| 11/27/1990 | CA2033165A1 Sewage disposal method employing circulating filter media and an apparatus carrying out the same |
| 11/22/1990 | EP0398685A1 A method and an apparatus for treating fiber suspension |
| 11/20/1990 | US4971688 Apparatus for separating at least two elements contained in a liquid or gaseous fluid by means of an absorbent filtering material |
| 11/17/1990 | CA2016966A1 Method and an apparatus for treating fiber suspension |
| 11/14/1990 | EP0397403A1 Device and method for depletion of the leucocyte content of blood and blood components |
| 11/13/1990 | US4969996 Water purification device with an intake funnel |
| 11/06/1990 | CA1275943C "filterbett" filter bed |
| 10/30/1990 | US4966698 Filter system and scrubber |
| 10/30/1990 | US4966692 Filtration system having flow control means and tank adapter with selective venting |
| 10/30/1990 | CA1275593C Arrangement for liquid treatment of pulp |
| 10/24/1990 | EP0393277A2 Filter assembly |
| 10/24/1990 | CN2064259U Semisphere filter |
| 10/24/1990 | CN1046291A Filter apparatus for filtering liquid |
| 10/17/1990 | CN1046101A Water repurification method of city water and its equipment |
| 10/09/1990 | US4961326 Material processing system |
| 10/04/1990 | DE3910579A1 Apparatus for separating off suspended matter from water |
| 09/27/1990 | DE3909970A1 Apparatus for the filtration of liquids in the manner of a rapid filter and a process for operating such an apparatus |
| 09/18/1990 | US4957631 Traveling bridge filter with surface wash |
| 09/18/1990 | CA1274188A1 Device for the recapture of water in a granular material filter bed |
| 09/12/1990 | EP0386030A1 A method of and plant for purifying water |
| 09/05/1990 | EP0385050A1 Back-wash multiple layer filtering device |
| 08/29/1990 | EP0383788A1 Method and apparatus for filtering contaminants. |
| 08/29/1990 | CN2061172U Iron and fluorine removing water purification unit for sealed cinder |
| 08/15/1990 | CN1009160B Waste treatment method and device |
| 08/14/1990 | US4948499 Simplified method and apparatus for purification |
| 08/08/1990 | EP0381032A2 Filter body with modular elements |
| 08/07/1990 | US4946602 Method of cleaning filter discs in a suction dryer using ultrasonic vibration |
| 08/07/1990 | US4946600 Water repurification method of city water and its equipment |
| 07/24/1990 | US4943211 Sand filter cleaning system |
| 07/18/1990 | EP0378024A1 Device for setting and fastening of parts on filter bottom for securing the fluid transit through the bottom |
| 07/17/1990 | US4941975 Star-shaped filter nozzle |
| 07/04/1990 | EP0375739A1 Water clarification system adapted for removing particulate matter of greater than a predetermined size. |
| 07/03/1990 | US4938038 Material processing system |
| 06/27/1990 | CN1043274A Pressure-fed separation apparatus |
| 06/26/1990 | US4936118 Material processing system |
| 06/14/1990 | WO1990006161A1 Filtering device |
| 06/07/1990 | DE3844658A1 Apparatus for filtering liquids |
| 06/05/1990 | US4931175 Water clarifying apparatus |
| 06/05/1990 | CA1269961A1 Device for distributing a material upon a surface |
| 05/30/1990 | EP0370779A2 Pressure-fed separation apparatus |
| 05/30/1990 | EP0370294A1 Scraper for a rotating filter |
| 05/24/1990 | CA2003679A1 Dry filter for the treatment of water |
| 05/19/1990 | CA2003215A1 Stripping device for rotary filters |
| 05/16/1990 | EP0368076A2 Filtering apparatus for liquids, especially for beverages |
| 05/15/1990 | US4925570 Method of filtering |
| 05/15/1990 | US4925556 Method for the manufacture of floors for filters, and floors thus made |
| 05/09/1990 | EP0366903A2 Filter spray head with ring-shaped filter segments |
| 05/08/1990 | US4923609 Method and apparatus for purifying liquids employing a particulate filter and a membrane |
| 05/08/1990 | US4923606 Plastic-jacketed filter underdrain block |
| 05/08/1990 | US4923600 Water clarification system adapted for removing particulate matter of greater than a predetermined size |
| 05/08/1990 | CA2002553A1 Filtering apparatus for filtering liquids, in particular beverages |
| 05/03/1990 | DE3836603A1 Process and apparatus for anaerobic biological waste water purification |
| 05/02/1990 | EP0365887A2 Filter cartridge for a liquid-filtration apparatus, especially for water filters |
| 04/18/1990 | CN1007590B Apparatus for supplying unclogging gas to fluidised bed apparatus |
| 04/05/1990 | WO1990003230A1 Solid waste retriever |
| 04/03/1990 | US4913815 Concentric dual bag filter apparatus with contained media |
| 04/03/1990 | CA1267367A1 Procedure for filtering lime sludge meant to be regenerated to lime |
| 03/27/1990 | US4911848 Adjustment of solid content; adding flocculant; spreading mixture and drying |
| 03/27/1990 | US4911831 Cleaning under body of liquid; controlled depth skimming device |
| 03/14/1990 | EP0358543A1 Apparatus for separating at least two elements present in a gaseous or a liquid fluid with the aid of a filtering or adsorbing material |
| 03/13/1990 | US4908136 Method and apparatus for forming and ion-exchanging a filter cake |
| 03/08/1990 | DE3828008A1 Apparatus for filtering liquids |
| 03/06/1990 | US4906381 Modular multi-media filtration unit |
| 03/01/1990 | DE3828579A1 Method for the filtration of waste water (effluent) treated in sewage treatment plants and apparatus for carrying out the method |
| 02/14/1990 | CN1039580A Method for recovering crystals from crystal-containing slurry |
| 02/13/1990 | US4900434 Apparatus for continuous filtration of fluids |
| 02/13/1990 | US4900400 Arrangement for liquid treatment of pulp |
| 02/07/1990 | CN1006680B Air-water counter washing process of filter tanks by using ejector air pump |
| 01/31/1990 | EP0352320A1 Thickener. |
| 01/31/1990 | EP0352272A1 Arrangement for an inlet pipe in a rotating drum sieve. |
| 01/31/1990 | CN1039188A 流体过滤器 Fluid filter |
| 01/30/1990 | US4897188 Filtering device |
| 01/24/1990 | EP0352205A1 Device for regulating the filters of a multifilter filtration plant |
| 01/23/1990 | US4895655 Filtration apparatus |
| 01/23/1990 | US4895648 Filter cover for a purification insert in a water treatment device with a hollow tube |
| 01/17/1990 | EP0350884A2 Water filtering device with a filter element |