| Patents for F04D 1 - Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (3,447) |
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| 03/19/1991 | WO1991004417A1 Pump or compressor unit |
| 03/19/1991 | CA2066672A1 Pump or compressor unit |
| 03/08/1991 | WO1991003649A1 Sheet metal pump casing |
| 02/26/1991 | CA1280639C Method and apparatus for pumping liquids |
| 02/13/1991 | CN2071267U Vane automatic balance shaft force centrifugal pump |
| 02/06/1991 | EP0411428A2 Windscreen washer pump for vehicle |
| 02/06/1991 | CN2070836U Centrifugal pump driven by supple shaft outside waterpipe for depth well |
| 02/06/1991 | CN2070835U Simple shield pump |
| 01/30/1991 | CN2070371U Water/blow two-purpose centrifugal pump |
| 01/30/1991 | CN1011436B Multi-stage pump |
| 01/23/1991 | EP0408618A1 Rotary machine with non-positive displacement, for use as a pump, compressor, propulsion unit, generator or drive turbine |
| 01/23/1991 | CN2069938U Multi-stage centrifugal pump |
| 01/09/1991 | EP0406787A2 Case, particularly for centrifugal radial pumps, and method for manufacturing thereof |
| 01/02/1991 | CN2068608U Detachable pipeline pump |
| 12/18/1990 | US4978277 Regenerative turbomachine |
| 12/13/1990 | WO1990015273A1 Sealing arrangement |
| 11/27/1990 | US4973408 Water purification and desalinaiton |
| 11/22/1990 | EP0398005A2 Pump |
| 11/15/1990 | WO1990013460A1 Double-acting pump, in particular for windscreen wiper systems in motor vehicles |
| 11/14/1990 | CN1046962A Screw recoil pump |
| 11/01/1990 | WO1990012963A1 High capacity, high efficiency pump |
| 10/17/1990 | CN2063988U Multi-stage centrifugal deep sucktion pump |
| 10/17/1990 | CN2063987U Submersible electric pump |
| 10/17/1990 | CN1010049B Balancing-type rotary diversion case deep well phreatic water pump |
| 10/16/1990 | CA1275261C Process and device for filtering out particles suspended in a liquid |
| 10/09/1990 | US4961692 Oscillating vessel pump |
| 09/26/1990 | CN2062765U Multistage centrifugal pump with double outlets |
| 08/29/1990 | CN2061221U Large-flow high-lift section type double-inlet sludge pump |
| 08/01/1990 | CN1009017B Submersible pump |
| 07/25/1990 | CN2059686U Self-suction pump |
| 07/18/1990 | EP0378251A2 Magnetically suspended and rotated impellor pump apparatus |
| 07/12/1990 | DE3900623A1 Centrifugal pump stage |
| 07/10/1990 | US4940385 Rotary disc pump |
| 07/05/1990 | DE3939336A1 Water supply pump with bladed impeller - has inlet opening of greater dia. than that of outlet edge and inlet guide receiving impeller |
| 07/04/1990 | EP0376644A1 Radial flow fluid pressure module |
| 07/03/1990 | US4938661 Multistage centrifugal compressor |
| 06/21/1990 | DE3842826A1 Centrifugal pump having a double-flow suction stage |
| 05/22/1990 | US4927323 Radial flow fluid pressure module |
| 05/09/1990 | CN1041992A Multistage centrifugal compressor |
| 05/08/1990 | US4923367 Submersible pump with plastic housing |
| 04/10/1990 | US4915194 Lubricating oil feed system |
| 03/21/1990 | EP0359514A2 Multistage centrifugal compressor |
| 03/21/1990 | EP0359445A2 Impeller pumps |
| 03/20/1990 | US4909705 Multi-stage diffuse-type centrifugal pump |
| 03/07/1990 | CN2054094U Multi-stage high-lift centrifugal pump impeller |
| 03/07/1990 | CN2054093U Centrifugal pump with balanced inlet pressure for chemical industry |
| 02/28/1990 | CN1040073A Submersible pump |
| 02/21/1990 | CN2053262U Vortex-type diving pump |
| 02/21/1990 | CN2053261U Universal energy-saving water pump |
| 02/21/1990 | CN1006927B Vertically outside installed underliquid pump |
| 02/14/1990 | CN2052830U Single-stage, single suction ceutrifugal oil pump |
| 01/31/1990 | EP0353002A2 A regenerative turbomachine |
| 01/24/1990 | CN2051680U Energy-saving multistage centrifugal pump |
| 01/18/1990 | DE3823726A1 Improvements in the design of fuel feed pumps |
| 01/16/1990 | US4893986 High-pressure high-temperature coal slurry centrifugal pump and let-down turbine |
| 01/11/1990 | DE3823214A1 Centrifugal pump |
| 01/10/1990 | CN1038686A Rotary machine with non positive displacement usable as pump, compressor, impeller, generater or turbine |
| 01/02/1990 | CA1264126A1 Dual volute molten metal pump and selective outlet discriminating means |
| 12/27/1989 | EP0348342A1 Centrifugal machine with opposing rotation impellers |
| 12/27/1989 | CN2050099U Helix tube type liquid lifting unit |
| 12/20/1989 | CN2049699U Multi-stage centrifugal postposition pump capable of bearing axial impact force |
| 12/14/1989 | WO1989012170A1 Method and apparatus for processing fluids |
| 12/13/1989 | EP0345258A1 Centrifugal pump |
| 12/13/1989 | CN2049284U Jet injector with rotary pump case |
| 12/13/1989 | CN1037960A 索式物位计 Cable Level Meter |
| 11/23/1989 | DE3816280A1 Housing part for centrifugal pumps |
| 10/31/1989 | US4877372 Multi-stage rotary pump |
| 10/24/1989 | US4875826 Pitot pump assembly for a rotating fluid management device |
| 10/05/1989 | WO1989009342A1 Rotary machine with non-positive displacement, for use as a pump, compressor, propulsion unit, generator or drive turbine |
| 10/03/1989 | US4871301 Centrifugal pump bearing arrangement |
| 09/27/1989 | EP0334737A1 Rotary non-positive machine, applicable as pump, compressor, propellor, generator or motive turbine |
| 09/26/1989 | US4869650 Oscillating vessel pump |
| 09/13/1989 | CN1035550A Centrifugal pump bearing arrangement |
| 09/12/1989 | US4865519 Oil submersible pump |
| 09/08/1989 | WO1989008191A1 Biaxial contrarotating centrifugal fluid pressure booster |
| 08/23/1989 | CN2043284U Domestic central water-heating miniature circulating pump |
| 08/09/1989 | EP0327230A2 Heat pumps |
| 07/11/1989 | US4846152 Single-stage axial flow blood pump |
| 07/05/1989 | CN1033678A Multi-stage pump |
| 06/28/1989 | CN2040109U Electric flattener for flattening cotton-wadding of quilt |
| 06/07/1989 | CN1033308A Centrifugal water pump capable of rotating forward and backward |
| 06/01/1989 | WO1989004645A1 Percutaneous blood pump with mixed-flow output |
| 06/01/1989 | WO1989004644A1 Single-stage axial flow blood pump |
| 05/17/1989 | EP0315761A1 Device for supplying lubricant |
| 05/02/1989 | US4826402 High-capacity centrifugal pump |
| 04/26/1989 | CN1004016B Cylindrical housing for a turbine |
| 04/04/1989 | US4817586 Percutaneous bloom pump with mixed-flow output |
| 03/28/1989 | US4815930 Cavitating centrifugal pump |
| 03/28/1989 | US4815929 Generating a vortex of liquid to pump ambient liquid |
| 02/15/1989 | CN2032660U Fully enclosed centrifugal pump |
| 02/08/1989 | CN2032267U Axial-flow centrifugal impeller |
| 01/19/1989 | DE3721824A1 Water levitation vortex pump |
| 01/12/1989 | DE3721378A1 Centrifugal pump |
| 01/11/1989 | EP0145738B1 Centrifugal pump |
| 01/04/1989 | CN2030267U New mechanically sealed centrifugal sand pump |
| 11/29/1988 | CA1245508A1 Hydrostatic bearing for pumps and the like |
| 11/22/1988 | US4786230 Dual volute molten metal pump and selective outlet discriminating means |
| 11/08/1988 | CA1244283A1 Eddy pump |
| 10/26/1988 | EP0287924A2 A pump by vessel revolution |
| 10/18/1988 | US4778334 Centrifugal pump |