| Patents for F04D 1 - Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (3,447) |
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| 06/08/1994 | CN2168102Y Balanced suction centrifugal pump |
| 06/07/1994 | US5318403 Interstage casing for a pump made of sheet metal and method of manufacturing the same |
| 06/01/1994 | CN1087405A Rotor for blade compressor |
| 05/18/1994 | EP0597157A1 Liquid pump |
| 05/17/1994 | US5312225 Axially thrust-compensated turbo machine |
| 05/04/1994 | CN2163888Y Energy-saving rolling balancing device for multi-stage centrifugal pump |
| 04/28/1994 | WO1994009274A1 Sealless rotodynamic pump |
| 04/13/1994 | CN2161754Y Water pump |
| 04/13/1994 | CN2161753Y 离心水泵 Centrifugal pumps |
| 04/06/1994 | CN2160775Y Multi-stage centrifugal pump with symmetric impellers |
| 03/31/1994 | WO1994007031A1 Sectional-casing-design rotary pump |
| 03/31/1994 | DE4232020A1 Kreiselmaschine, insbesondere Kreiselpumpe, in Gliedergehäusebauart Centrifugal machine, in particular centrifugal pump, segmental type construction |
| 03/29/1994 | US5297926 Flow generating apparatus and method of manufacturing the apparatus |
| 03/29/1994 | US5297925 Water column floating pump |
| 03/23/1994 | EP0588258A1 Multipart stage housing |
| 03/23/1994 | CN2159464Y Miniature electric water pump |
| 03/23/1994 | CN1084257A Double centrifugal fluid transporting method and appliance |
| 03/03/1994 | WO1994004827A1 Multi-stage centrifugal pump incorporating a sealed thrust bearing |
| 03/02/1994 | EP0397668B1 Percutaneous blood pump with mixed-flow output |
| 03/02/1994 | EP0396575B1 Single-stage axial flow blood pump |
| 02/24/1994 | DE4227249A1 Pot pump for fluids - has pump housing comprising cast suction connection, cast pressure connection, and intervening welded pipe section, the two connections having feet, to which the pump housing is fixed on a |
| 02/23/1994 | CN2157336Y Multistage double suction dual-purpose water pump |
| 02/23/1994 | CN2157335Y Moving flexible shaft transmission centrifugal pump |
| 02/16/1994 | CN2156319Y 反渗透泵 RO pumps |
| 01/12/1994 | CN2152924Y Fluid propeller |
| 01/05/1994 | CN2152106Y Pump with screw joint pump |
| 12/23/1993 | DE4315448A1 Peripheral wheel or turbine pump - has flow feed path using centrifugal impeller components and guide elements. |
| 12/08/1993 | CN1079276A 离心泵 Centrifugal |
| 12/01/1993 | EP0571739A1 Centrifugal pump with an improved axial diffusor |
| 11/16/1993 | US5261784 Variable pressure pitot pump |
| 11/15/1993 | CA2096107A1 Centrifugal suction pump |
| 11/03/1993 | EP0568069A2 Turbomolecular vacuum pumps |
| 11/03/1993 | CN1078023A Double suction, single-stage and self-priming centrifugal pump |
| 10/28/1993 | WO1993020860A1 Pumping apparatus with fixed chamber impeller |
| 10/26/1993 | US5256033 Sheet metal interstage casing for a pump |
| 10/20/1993 | EP0566089A1 Pump casing made of sheet metal |
| 10/20/1993 | CN1022505C Non variable capacitance type rotary machine |
| 10/19/1993 | US5253977 Multistage pump for two-phase effluents |
| 09/29/1993 | CN1076765A Multipurpose asynchronous electrical motor centrifugal pump |
| 09/29/1993 | CN1022260C Centrifugal pump housing constructed of sheet metal |
| 09/22/1993 | EP0561689A1 Centrifugal pumps |
| 09/21/1993 | US5246336 Motor driven complex pump apparatus |
| 08/25/1993 | CN2140980Y Non-shaft-sealing axial force balanced underliquid pump |
| 08/25/1993 | CN2140979Y Two-way efficient flexible power rotary-jet pump |
| 08/24/1993 | US5238117 Mineral processing screen separator |
| 08/18/1993 | CA2061554A1 Three function pump |
| 08/11/1993 | EP0425613B1 Double-acting pump, in particular for windscreen wiper systems in motor vehicles |
| 08/10/1993 | US5234320 Centrifugal suction pump |
| 08/10/1993 | US5234317 Sheet metal interstage casing for a pump |
| 08/04/1993 | EP0553918A1 Pump device for a viscous fluid |
| 08/03/1993 | US5232351 Centrifugal oil pump booster |
| 08/03/1993 | US5232342 High pressure multi-stage centrifugal pumps |
| 08/03/1993 | US5232333 Single flow turbopump with integrated boosting |
| 07/22/1993 | WO1993014319A1 Pressure/recirculating pump |
| 07/21/1993 | CN2138711Y Agricuture double ring sealed cut-off single stage centrifagal water pump |
| 07/21/1993 | CN2138710Y Double support structure vane pump |
| 07/21/1993 | CN1074514A Small discharge and high lift ground centrifugal pump |
| 07/20/1993 | US5228831 Sheet metal centrifugal pump casing |
| 07/14/1993 | CN2138203Y Axial strength balancing unit of centrifugal pump |
| 07/08/1993 | WO1993013318A1 Multiphase fluid treatment |
| 07/08/1993 | WO1993013297A1 Water column floating pump |
| 07/07/1993 | EP0549579A1 Rotary pump |
| 07/07/1993 | EP0537146A4 Rotary disc pump |
| 07/06/1993 | US5224823 Cooling water pump for use on the pump housing of an internal combustion engine |
| 07/06/1993 | US5224817 Shunt flow turbopump with integrated boosting |
| 06/27/1993 | CA2085560A1 Combined boiler feed and condensate pump |
| 06/16/1993 | CN2136347Y Non-slip friction reverse mechanism for chain oil pump |
| 06/15/1993 | US5219271 High capacity, high efficiency pump |
| 06/10/1993 | WO1993011360A1 Centrifugal pump with adaptor for various valves |
| 06/09/1993 | CN2135673Y Full-closed inner drainage no leakage pump |
| 06/01/1993 | US5215448 Combined boiler feed and condensate pump |
| 05/27/1993 | WO1993010361A1 Electrohydraulic machine |
| 05/13/1993 | DE4137103A1 Elektrohydraulisches geraet Geraet electro-hydraulic |
| 05/12/1993 | CN2132849Y Dual-purpose vertical or horizontal mid-open pump |
| 05/11/1993 | US5209650 Integral motor and pump |
| 04/21/1993 | EP0537146A1 Rotary disc pump. |
| 04/21/1993 | CN1071230A Very-high-lift vortex pump |
| 04/14/1993 | EP0537128A2 Pump |
| 04/13/1993 | US5201633 Vertical centrifugal hydraulic pump assembly |
| 04/10/1993 | CA2077582A1 Pump |
| 04/07/1993 | CN2129349Y Fluid-sealing type centrifugal pump |
| 03/16/1993 | US5193974 Dynamic pressure recovery seal |
| 03/10/1993 | EP0530518A1 Turbo machine |
| 03/09/1993 | US5192183 Laminar flow fans |
| 03/09/1993 | CA1314173C Submersible pump with plastic housing |
| 03/03/1993 | EP0529379A1 Rotor assembly for turbomachines |
| 03/03/1993 | CN2127749Y Vertical suspension centrifugal pump |
| 02/16/1993 | US5186606 Double feed pump, in particular for windshield washer systems in motor vehicles |
| 01/21/1993 | WO1993001430A1 Dynamic pressure recovery seal |
| 12/30/1992 | CN2126333U 旋涡泵 Vortex pump |
| 12/30/1992 | CN2126332U Soft-shaft submersible centrifugal draining pump for farming use |
| 12/29/1992 | US5174726 Liquid pump |
| 12/29/1992 | CA1311929C Regenerative turbomachine |
| 12/23/1992 | EP0519176A1 Motor driven complex pump apparatus |
| 12/23/1992 | CN2125737U Centrifugal water pump |
| 12/23/1992 | CN1019597B Differential pressure piston type balance unit of axial forces for multistage pump |
| 12/22/1992 | USRE34148 Scroll type compressor with variable displacement mechanism |
| 12/16/1992 | CN2125029U Water pump for mine |
| 12/16/1992 | CN1067098A Efficient self-priming pump controlled by gas-liquid separation chamber |
| 12/10/1992 | WO1992021388A1 Pump |