| 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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| 01/17/1990 | EP0350761A2 Drum separator for cooling lubricants |
| 01/16/1990 | US4894149 Biological filtration device |
| 01/11/1990 | DE3839576C1 Dry filter for water treatment |
| 01/03/1990 | CN1006281B Self-cleaning fluid filter |
| 01/02/1990 | US4891142 Moving bed filtration apparatus and method |
| 12/26/1989 | US4889625 Filter for concentrating suspensions |
| 12/05/1989 | US4885083 Single chamber filter vessel |
| 12/05/1989 | CA1263611A1 Rotary plow assembly |
| 12/05/1989 | CA1263610A1 Raisable plow assembly |
| 11/30/1989 | WO1989011323A1 Process for recovering crystals from slurry |
| 11/30/1989 | WO1989011322A1 Filter element and filtration process |
| 11/29/1989 | EP0343980A1 System and process for washing granular filter media |
| 11/29/1989 | CN1037464A Filter cover for purification insert in water treatment device with hollow tube |
| 11/23/1989 | DE3832978C1 Gravity filter |
| 11/21/1989 | US4882056 Cartridges |
| 11/21/1989 | US4882053 Porous filter media support plate |
| 11/21/1989 | US4882052 Filter structure for liquid purification and incorporating detent arrangement |
| 11/15/1989 | EP0341356A1 Filtering device |
| 11/14/1989 | US4880311 Apparatus for supplying unclogging gas to fluidized bed apparatus |
| 11/08/1989 | EP0340382A2 Screen cover for a cleaning insert in a water regeneration device with a hollow tube |
| 11/07/1989 | US4878264 Cleaning equipment |
| 10/31/1989 | US4877525 Pressurized vessel with false bottom and throughpipe coated at weld site |
| 10/31/1989 | US4877521 Quick-change filter cartridge and head therefor |
| 10/25/1989 | CN1036514A Water purification device with intake-funnel |
| 10/18/1989 | EP0337663A2 Filter and bleed valve therefor |
| 10/11/1989 | EP0336686A1 Granular media filters |
| 10/10/1989 | US4872977 Solid waste retriever |
| 10/04/1989 | EP0335571A2 Spiral wrapped fluid treatment element |
| 10/04/1989 | EP0335066A2 Water purification device with inlet funnel |
| 09/27/1989 | EP0334639A1 Filter Device |
| 09/27/1989 | EP0334527A2 Slime control for primary filtration systems |
| 09/26/1989 | US4869817 Backwash valve lever control system |
| 09/26/1989 | CA1261764A1 Insert for a water purification device |
| 09/13/1989 | EP0331957A2 Continuously operating liguid treatment device |
| 09/12/1989 | US4865749 Indoor swimming pool maintenance, cyclone separator, ozone treatment |
| 08/30/1989 | EP0330513A2 Fluid filter |
| 08/29/1989 | US4861472 Apparatus for filtration of a suspension |
| 08/29/1989 | US4861466 Pressure filter assembly with bleed valve |
| 08/23/1989 | EP0328548A1 Arrangement for an inlet and outlet in a rotating drum sieve |
| 08/22/1989 | US4859330 Traveling bridge filter with air scour |
| 08/10/1989 | WO1989007003A1 Thickener |
| 08/10/1989 | DE3802723A1 Pit well |
| 08/08/1989 | US4855123 With oxygen using specific activated carbon catalyst |
| 07/27/1989 | DE3900754A1 Process and apparatus for the separation of suspended matter adhering to a packing |
| 07/20/1989 | DE3800613A1 Apparatus for treating water |
| 07/19/1989 | EP0324673A1 Filter bottom and process to its manufacture |
| 07/11/1989 | EP0312590A4 Universally-adaptable pool water filter structures. |
| 07/11/1989 | CA1257413A1 Apparatus for clarification of water |
| 06/27/1989 | US4842744 Filter bed of particulate material moves downwardly in a cylindrical annular container bounded by fluid permeable walls, circulated and returned to the top; prevents bridge development and flow irregularities |
| 06/06/1989 | US4836937 System for removing liquid from a slurry of liquid and powdered material |
| 05/16/1989 | US4830750 Filter belt arrangement |
| 05/09/1989 | US4828692 Simplified method and apparatus for purification |
| 05/02/1989 | US4826609 Filter media for filter systems |
| 05/02/1989 | US4826607 Filter cake |
| 04/26/1989 | EP0312590A1 Universally-adaptable pool water filter structures |
| 04/20/1989 | WO1989003239A1 A method of and plant for purifying water |
| 04/18/1989 | US4822485 Recirculating sand filter valve |
| 04/18/1989 | US4821800 Composite particles having iron-containing core surrounded by chromium cladding |
| 04/18/1989 | CA1252738A1 Drip feeding device for rotary disc filters |
| 04/12/1989 | EP0311360A2 Cleaning equipment |
| 04/06/1989 | WO1989002776A1 Filter media for filter systems |
| 04/05/1989 | EP0310221A1 Slow sand filter cleaning device |
| 04/05/1989 | EP0309502A1 Method for the cleaning of the filter plates in a suction dryer. |
| 04/05/1989 | CN1032112A Cartridge type filter for water purification and the like |
| 04/04/1989 | US4818414 Retaining waste filtrate |
| 04/04/1989 | US4818384 Recirculating sand filter |
| 03/22/1989 | CN1031825A Simplified method and apparatus for purification |
| 03/14/1989 | US4812230 Self-cleaning; cylindrical cartridge has telescoping movement |
| 03/09/1989 | WO1989001816A1 Water clarification system adapted for removing particulate matter of greater than a predetermined size |
| 03/09/1989 | WO1989001814A1 Filtration plant |
| 03/08/1989 | EP0305606A1 Back-wash filter assembly |
| 03/08/1989 | EP0305394A1 Arrangement for liquid treatment of pulp. |
| 03/07/1989 | US4810394 Process and apparatus for removing solid material including blood cells from whole blood |
| 02/28/1989 | US4808317 Process for continuous contacting of fluids and solids |
| 02/14/1989 | CA1249914A1 Device for continuous contacting of fluids and solids |
| 02/09/1989 | WO1989000977A1 Cartridge type filter for liquid purification |
| 02/09/1989 | WO1989000976A1 Simplified method and apparatus for purification |
| 12/27/1988 | US4793934 Method for enhancing the separation capacity of a multi-bed filtration system |
| 12/14/1988 | EP0187795B1 Sector with variable thickness for a disc-type rotary filter |
| 12/13/1988 | US4790934 Apparatus for filtering fluid medium |
| 12/06/1988 | US4789486 Water desalinization process |
| 11/30/1988 | EP0293350A2 Filter for concentrating suspensions |
| 11/29/1988 | US4787987 Filter apparatus and method |
| 11/23/1988 | EP0291716A2 Method for enhancing the separation capacity of a multibed filtration system |
| 11/23/1988 | EP0291538A1 Process and apparatus for the continuous filtration of liquids |
| 11/10/1988 | DE3813264A1 Process and apparatus for purifying waste waters arising in dental treatments |
| 11/03/1988 | WO1988008475A1 Universally-adaptable pool water filter structures |
| 11/03/1988 | WO1988008324A1 Quick-change filter cartridge and head therefor |
| 11/02/1988 | EP0289444A2 Filter apparatus |
| 10/25/1988 | US4780219 Bed of ground polyethylene particles |
| 10/20/1988 | WO1988007887A1 Method for the cleaning of the filter plates in a suction dryer |
| 10/12/1988 | EP0286477A1 Process and apparatus for controlling the rate of filtration in a filter bed, especially in the treatment of domestic water |
| 10/11/1988 | US4776962 Cleaning fibrous filter mass by expansion and compaction during backwashing |
| 09/07/1988 | WO1988006479A1 Arrangement for an inlet pipe in a rotating drum sieve |
| 09/06/1988 | CA1241775A1 Mobile fluid purification unit |
| 08/31/1988 | EP0280620A1 Filtration apparatus and process for cleaning said apparatus |
| 08/31/1988 | EP0279975A1 Rise-rate control of pulsed-bed granular medium filters |
| 08/24/1988 | EP0278952A1 Filter arrangement. |
| 08/23/1988 | US4765894 Disk screen for filtering machined chips from coolant; rotary shaft connection and receiving vessel |
| 08/23/1988 | US4765892 Sand filter media and an improved method of purifying water |