Patents for C02F - Treatment of water, waste water, sewage, or sludge (726) |
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01/12/1993 | US5178774 Dissolving and coagulation of diallyldimethylammonium chloride polymer |
12/22/1992 | CA1311717C Effluent treatment |
12/09/1992 | EP0238639B1 Method of treating fluids |
11/11/1992 | CN1019003B Devices for treating water containing calcium carbonate and installation consisting of these device |
11/03/1992 | US5160620 Method and apparatus for treating water |
08/05/1992 | EP0471784A4 Method and composition for treating waste water |
08/05/1992 | CA2060586A1 Device that demineralizes water by magnetization |
07/15/1992 | EP0283509B1 The control of biofouling in aqueous systems by non-polymeric quaternary ammonium polyhalides |
06/24/1992 | EP0279849B1 A process for cleaning chlorinated water and an apparatus for carrying out the process |
06/09/1992 | US5120453 Oxidative removal of cyanide from aqueous streams |
05/06/1992 | EP0483290A1 Immersible biological filter for the purification of waste water. |
02/26/1992 | EP0471784A1 Method and composition for treating waste water. |
02/19/1992 | EP0318483B1 Method and apparatus for electrolytic treatment of liquids, especially waste water |
01/09/1992 | WO1992000247A1 Purification of aqueous liquor |
08/21/1991 | EP0336929B1 Method for water purification |
08/13/1991 | US5039414 Process for separating and/or recovering hydrocarbon oils from water using biodegradable absorbent sponges |
07/24/1991 | WO1991011396A1 Method and reactor for purification of water |
07/16/1991 | CA1286325C Hazardous waste reactor system |
07/10/1991 | EP0435944A1 Water purifying system |
06/11/1991 | US5022974 Method and apparatus for electrolytic treatment of liquids, especially waste water |
05/14/1991 | US5015448 Particulate material suitable for selectively separating metal cations from aqueous solutions, process for its production, and use thereof |
02/21/1991 | DE4024191A1 Concrete oil-water sepn. container with end bulges - holding integral inlet and outlet bores respectively for raw and treated water |
02/07/1991 | WO1991001279A1 Immersible biological filter for the purification of waste water |
02/06/1991 | EP0410961A1 A method and an apparatus for separating solid particles from a liquid. |
02/03/1991 | CA2007615A1 Method of improving the quality of large amount of water and the quantity of dissolved oxygen therein, and apparatus for said improvement |
02/02/1991 | WO1991001945A1 Process for separating and/or recovering hydrocarbon oils from water using biodegradable absorbent sponges |
02/02/1991 | CA2037925A1 Process for separating and/or recovering hydrocarbon oils from water using biodegradable absorbent sponges |
01/16/1991 | EP0408545A1 Process for immobilizing harmful substances and/or for making them inert |
01/15/1991 | WO1991001280A1 Process for rendering inert and/or immobilizing environmentally harmful substances |
01/15/1991 | CA2063395A1 Process for rendering inert and/or immobilizing enviromentally harmful substances |
12/09/1990 | CA2060508A1 Removal of contaminants |
11/13/1990 | CA1276359C Semi-permeable membrane of sulphonated polyarylether sulphones |
11/10/1990 | WO1990013519A1 Method and composition for treating waste water |
10/31/1990 | EP0309474B1 Process and device for large surface-area fine-bubble gasification of liquids |
10/24/1990 | EP0325596A4 Hazardous waste reactor system |
09/25/1990 | CA1274441A1 Hydrated calcium hypochlorite tablets containing lime compounds as lubricants and solubility retardants |
08/29/1990 | EP0218608B1 Low-foaming compositions |
06/14/1990 | WO1990006288A1 Method and apparatus for treating water |
06/13/1990 | EP0372132A1 Small-pored crystalline titanium molecular sieve zeolites |
05/08/1990 | US4923614 Process and device for large surface-area fine-bubble gasification of liquids |
05/02/1990 | EP0215013B1 Magnetic conditioning of hard water |
04/05/1990 | WO1990003333A1 Water purifying system |
03/28/1990 | EP0360612A1 Water purifying system |
03/14/1990 | EP0167569B1 Deoxygenation process and apparatus |
03/07/1990 | EP0282476B1 Process and device for treating an aqueous liquid |
10/18/1989 | EP0336929A1 Method for water purification. |
10/17/1989 | US4874587 Vapor phase decomposing organic compounds with water |
08/02/1989 | EP0325596A1 Hazardous waste reactor system. |
07/04/1989 | CA1256822A1 Water conditioning device containing calcium carbonate, and installation including said device |
06/07/1989 | EP0318483A1 Method and apparatus for electrolytic treatment of liquids, especially waste water. |
05/18/1989 | DE3836138A1 Particulate medium suitable for the selective separation of metal cations from aqueous solutions, process for the production thereof and use thereof |
05/03/1989 | EP0314026A1 Particle agent for the selective removal of metal cations from aqueous solutions, process for its production and its use |
04/12/1989 | EP0283509A4 The control of biofouling in aqueous systems by non-polymeric quaternary ammonium polyhalides. |
04/04/1989 | US4818345 Distillation apparatus |
03/08/1989 | EP0305606A1 Back-wash filter assembly |
01/10/1989 | CA1248645A1 Deoxygenation process and apparatus |
12/12/1988 | EP0238639A4 Method of treating fluids. |
11/17/1988 | EP0229150B1 Apparatus for desalinating salt water by membrane distillation |
10/26/1988 | CN87102687A Water treatment process and products |
09/28/1988 | EP0283509A1 The control of biofouling in aqueous systems by non-polymeric quaternary ammonium polyhalides. |
09/21/1988 | EP0282476A1 Process and device for treating an aqueous liquid. |
09/20/1988 | US4772387 Fluid circulates in space between two concentric tubes through permanent magnetic field |
09/20/1988 | US4772369 Demineralization |
08/31/1988 | EP0279849A1 A process for cleaning chlorinated water and an apparatus for carrying out the process. |
06/21/1988 | US4752363 Adding alkali metal hydroxide, filtration and electrolysis |
05/19/1988 | WO1988003515A1 Method for water purification |
03/30/1988 | CN87106273A Hazardous waste reactor system |
03/16/1988 | EP0259525A1 Water treatment method and product |
03/10/1988 | WO1988001711A1 Hazardous waste reactor system |
03/01/1988 | US4728397 Apparatus for desalinating salt water by membrane distillation |
01/26/1988 | CA1231914A1 System for diaphragm distillation |
01/12/1988 | US4718985 System for diaphragm distillation |
01/07/1988 | EP0251691A2 Effluent treatment |
12/17/1987 | WO1987007590A1 Process and device for large surface-area fine-bubble gasification of liquids |
12/03/1987 | WO1987007175A1 Sludge scraper mechanism for settling tanks in sewage treatment plants |
09/30/1987 | EP0238639A1 Method of treating fluids. |
08/27/1987 | WO1987005005A1 A method and an apparatus for separating solid particles from a liquid |
07/30/1987 | WO1987004422A1 Process and device for treating an aqueous liquid |
07/22/1987 | EP0229150A1 Apparatus for desalinating salt water by membrane distillation. |
07/09/1987 | EP0218608A4 Low-foaming compositions. |
07/08/1987 | EP0227733A1 A distillation apparatus |
07/01/1987 | CN86108307A Method for the treatment of impure water |
04/22/1987 | EP0218608A1 Low-foaming compositions. |
04/10/1987 | EP0167569A4 Deoxygenation process and apparatus. |
03/26/1987 | WO1987001688A1 Method of treating fluids |
03/25/1987 | EP0215013A1 Magnetic conditioning of hard water. |
01/15/1987 | WO1987000160A1 Apparatus for desalinating salt water by membrane distillation |
12/31/1986 | WO1986007585A1 A distillation apparatus |
09/25/1986 | WO1986005510A1 Low-foaming compositions |
09/10/1986 | CN86101249A Devices for treating water containing calcium carbonate and installation consisting of these devices |
08/28/1986 | WO1986004887A1 Magnetic conditioning of hard water |
08/27/1986 | EP0191818A1 Electromagnetic treatment of water |
04/22/1986 | CA1203488A1 Desalination device and process |
04/02/1986 | EP0175956A2 Sand filter media and an improved method of purifying water |
03/13/1986 | WO1986001496A1 Electromagnetic treatment of water |
01/22/1986 | EP0168538A1 Clarifier |
01/15/1986 | EP0167569A1 Deoxygenation process and apparatus. |
01/03/1986 | WO1986000026A1 System for diaphragm distillation |
12/11/1985 | EP0164326A2 System for diaphragm distillation |
12/04/1985 | EP0162904A1 Clarifier |