| Patents for F04D 7 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts (4,105) |
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| 07/04/1989 | US4844693 Low-flow pump casing |
| 06/28/1989 | CN2040177U Nonleakage and anticorrosive chemical pump |
| 06/28/1989 | CN2040176U Cylinder sleeve of a mud pump with an inner ceramic liner tube |
| 06/27/1989 | US4842479 High head centrifugal slicing slurry pump |
| 06/21/1989 | EP0166760B1 Solid materials pump |
| 06/14/1989 | EP0320060A2 Pump device for low-viscosity liquids |
| 06/13/1989 | US4838559 Reactor coolant pump hydrostatic sealing assembly with improved hydraulic balance |
| 05/17/1989 | CN2037783U Acid pumping and exbausting machine |
| 05/16/1989 | US4830584 Pump or compressor unit |
| 05/03/1989 | CN2037005U Multi-stage slag-slurry pump with pre-balanced disc and balanced drum |
| 05/02/1989 | US4826401 Centrifugal pump |
| 05/02/1989 | US4826398 Medium consistency pump with self-feeding |
| 05/02/1989 | US4826396 Rotor self-lubricating axial stop |
| 04/05/1989 | CN2035403U Centrifugal non-stick pump |
| 03/28/1989 | US4815929 Generating a vortex of liquid to pump ambient liquid |
| 03/23/1989 | WO1989002534A1 Improved liner configuration |
| 03/21/1989 | CA1251404A1 Apparatus for separating gas from a fibre suspension |
| 03/14/1989 | US4812108 Magnet pump |
| 03/08/1989 | EP0305945A2 Reactor coolant pump hydrostatic sealing assembly with externally pressurized hydraulic balance chamber |
| 02/22/1989 | EP0303641A1 Transport ventilator. |
| 02/08/1989 | CN2032268U Mine submersible electric pump for explosion-proof and anti-silt |
| 02/07/1989 | US4802818 Slurry pump suction side liner with replaceable components |
| 02/01/1989 | CN1030815A Centrifugal pump for handling danger liquid particularly adapted for automatic full liquid priming of radioactive liquid |
| 01/25/1989 | EP0300251A2 Method and apparatus for pumping high consistency pulp |
| 01/25/1989 | CN2031466U 离心式叶轮 Centrifugal impeller |
| 01/11/1989 | EP0298949A2 Combined fluidizing and vacuum pump |
| 01/11/1989 | EP0298693A2 Self feeding pump |
| 01/11/1989 | EP0298442A2 A pump and a method of separating gas by such from a fluid to be pumped |
| 01/11/1989 | EP0298191A2 Multiple discharge cylindrical pump collector |
| 01/11/1989 | CN2030664U High sucking distance mud pump |
| 01/10/1989 | US4797063 Floating suction apparatus |
| 01/04/1989 | EP0297464A2 Method and apparatus for pumping high consistency fiber suspension |
| 12/28/1988 | EP0296952A1 Selfpriming centrifugal pump for dangerous liquids particularly radio-active liquids |
| 12/27/1988 | US4793777 Centrifugal pump with auxiliary impeller operatively associated with a primary impeller to balance the forces on the opposite sides thereof |
| 12/27/1988 | US4793767 Device for pumping highly-viscous material, in particular thick oil |
| 12/21/1988 | EP0295473A2 Reactor coolant pump hydrostatic sealing assembly with improved hydraulic balance |
| 12/20/1988 | US4792275 Pump construction |
| 12/07/1988 | EP0294064A1 Centrifugal pump system with inlet reservoir |
| 11/30/1988 | CN88201317U Turbulent type middle underflow pump |
| 11/24/1988 | EP0288500A4 Impellers for centrifugal pumps. |
| 11/22/1988 | US4786230 Dual volute molten metal pump and selective outlet discriminating means |
| 11/15/1988 | CA1244721A1 Grinder pump |
| 11/09/1988 | EP0289980A2 Submersible pump, in particular for low-boiling liquids |
| 11/08/1988 | CA1244284A1 Two stage medium consistency pulp pumping |
| 11/08/1988 | CA1244283A1 Eddy pump |
| 11/02/1988 | EP0288500A1 Impellers for centrifugal pumps. |
| 11/01/1988 | US4781527 Cartridge pump |
| 10/25/1988 | US4780053 Method and apparatus for pumping fiber suspensions |
| 10/18/1988 | US4778336 Cutter pump subassembly |
| 10/12/1988 | EP0286024A2 Reactor coolant pump sealing surfaces with titanium nitride coating |
| 10/11/1988 | US4776758 Combined fluidizing and vacuum pump |
| 10/11/1988 | US4776753 Method of and apparatus for pumping viscous fluids |
| 09/27/1988 | US4773819 Rotary disc slurry pump |
| 09/14/1988 | CN88101527A Centrifugal pump for handling liquid containing hard abvasives |
| 09/13/1988 | US4770604 Pulp centrifugal pump |
| 09/06/1988 | US4768920 Method for pumping fragile or other articles in a liquid medium |
| 08/30/1988 | US4767281 Centrifugal pump system with inlet reservoir |
| 08/25/1988 | WO1988006240A1 Transport ventilator |
| 08/17/1988 | EP0278388A2 Centrifugal pump for contaminated liquids |
| 08/16/1988 | US4764086 Blower for circulating larger gas volumes, in particular for high-power laser systems |
| 08/16/1988 | US4764085 Blower for circulating larger gas volumes, in particular for high-power laser systems operating according to the gas-transportation principle |
| 08/16/1988 | CA1240557A1 Impeller |
| 08/03/1988 | EP0276224A1 Device for pumping highly-viscous material, in particular thick oil. |
| 08/03/1988 | CN87100216A Vertically outside installed underliquid pump |
| 08/02/1988 | CA1239832A1 Flow-stabilizing volute pump and liner |
| 07/27/1988 | EP0275954A2 Mechanical pump equipment |
| 07/26/1988 | US4759690 Impeller |
| 07/14/1988 | WO1988005132A1 Improved pump construction |
| 06/30/1988 | WO1988004733A1 Centrifugal pump |
| 06/15/1988 | CN87106758A Impellers for centrifugal pumps |
| 05/17/1988 | US4744722 Method and apparatus for the mixing of liquid or gas into pulp stock |
| 05/05/1988 | WO1988003230A1 Centrifugal pump, particularly for dirty liquids |
| 05/03/1988 | US4741668 Centrifugal pump stage with abrasion resistant impeller hub |
| 04/27/1988 | EP0264654A1 Zircomium nitride coated article and method for making same |
| 04/26/1988 | CA1235606A1 Pump construction |
| 04/21/1988 | WO1988002821A1 Centrifugal pump for hot media |
| 04/21/1988 | WO1988002820A1 Impellers for centrifugal pumps |
| 04/12/1988 | US4737072 Centrifugal pump |
| 04/05/1988 | CA1234719A1 Fluid pump |
| 03/23/1988 | EP0260320A1 Cartridge pump. |
| 03/02/1988 | EP0257140A1 Nuclear reactor coolant pump impeller/shaft assembly |
| 03/01/1988 | US4728256 Underwater pump |
| 01/19/1988 | US4720248 Thermal barrier for submersible pump and motor assemblies |
| 12/23/1987 | CN87104408A Plastic centrifugal submersible fish pump |
| 12/16/1987 | EP0249555A1 Motorpump for a fraising device for digging trenches in the ground |
| 11/26/1987 | DE3640813A1 Submerged centrifugal pump |
| 10/21/1987 | EP0242068A2 Coolant pumping system for a nuclear reactor |
| 10/21/1987 | CN87200309U Self-priming corrosion-proof shunt pump |
| 10/13/1987 | CA1227968A1 Centrifugal pump impeller |
| 10/08/1987 | DE3609312A1 Centrifugal pump |
| 10/07/1987 | CN86211107U 液下泵 Liquid pumps |
| 10/06/1987 | US4697746 Grinder pump |
| 09/24/1987 | WO1987005667A1 Cartridge pump |
| 09/23/1987 | EP0237868A2 Radial or axial flow centrifugal pump |
| 09/09/1987 | EP0235392A1 Blower for the circulation of large volumes of gas, especially for high-power lasers |
| 09/01/1987 | US4690612 Nuclear reactor coolant pump impeller/shaft assembly |
| 08/26/1987 | EP0233859A1 Self-priming centrifugal pump for handling liquids mixed with a high fiber content |
| 08/25/1987 | US4688990 Pump construction |
| 08/25/1987 | CA1225877A1 Solid materials pump |
| 08/19/1987 | EP0232546A1 Blower for the circulation of large volumes of gas, especially for gas transport principle high power lasers |