| Patents for F04D 1 - Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (3,447) |
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| 12/01/2004 | CN1177965C Device for puming water in washing machine |
| 11/24/2004 | EP1478857A1 Anti-stall tip treatment means for turbo-compressors |
| 11/24/2004 | CN1177148C Locking device for locking stator pack of motor driven pumps |
| 11/17/2004 | EP1476663A1 Pump using waste tire |
| 11/16/2004 | US6817845 Centrifugal pump with switched reluctance motor drive |
| 11/11/2004 | WO2004097203A1 Propulsion of vehicles or transport of a medium by means of a conical body |
| 11/10/2004 | CN2654906Y Vertical multi-stage centrifugal pump |
| 11/02/2004 | CA2121215C Injection equipment |
| 10/28/2004 | WO2004092590A1 Vacuum water pump |
| 10/27/2004 | CN2651472Y Multistage centrifugal oil transfer pump with water inlet and outlet direction adjustment |
| 10/26/2004 | CA2317657C Pitot tube inlet insert |
| 10/20/2004 | EP1469204A1 Impeller |
| 10/20/2004 | EP1469202A1 Multistage pump |
| 10/20/2004 | CN1172090C Multi-stage variable pressure water supply pump for supply of water in city |
| 10/13/2004 | CN1536231A Method of controlling turbine machine having inlet quide blade and rotary wheel |
| 10/07/2004 | DE20308262U1 Vortex vacuum pump has a rotating round reservoir with a central opening in the base which is opened when the lower end of the vortex reaches the base of the reservoir |
| 10/06/2004 | CN2646424Y High pressure self balancing segment type centrifugal pump |
| 10/05/2004 | US6800955 Fluid-powered energy conversion device |
| 09/29/2004 | CN1532422A Radial strip back-to-balk multistage centrifugal pump |
| 09/22/2004 | CN2643030Y Easy-to-disassemble multi-stage pump |
| 09/22/2004 | CN1530555A Multistage electric pump set |
| 09/16/2004 | US20040179949 Multi-stage electric pump unit |
| 09/08/2004 | CN2639568Y Single-stage double-priming horizontal centrifugal pump |
| 09/01/2004 | EP1451472A2 Improved thrust bearing for multistage centrifugal pumps |
| 08/31/2004 | CA2178520C Low flow-rate pump |
| 08/25/2004 | EP1003970B1 Improved rotor for blood pump |
| 08/25/2004 | CN2635945Y Motor for liquid circulation |
| 08/25/2004 | CN1163671C Maze-type screw pump |
| 08/24/2004 | US6779608 Surface pump assembly |
| 08/11/2004 | CN2632347Y Vertical multi-stage centrifugal pumps |
| 07/28/2004 | EP1441129A1 Turbo pump |
| 07/28/2004 | CN2628757Y Non-seal firefighting pump |
| 07/14/2004 | EP1436510A1 Method for optimizing the operation of several compressor units in a natural gas compression station |
| 07/07/2004 | CN2623913Y Late dissolution viscose cutting pump |
| 07/01/2004 | DE10260443A1 Housing for multi-stage rotary pump is fabricated from sheet metal and has impeller wheel separated from the housing walls by a seal |
| 06/30/2004 | CN2622432Y Self-balance multi-stage segmental centrifugal pump |
| 06/24/2004 | WO1999043959A3 Improved thrust bearing for multistage centrifugal pumps |
| 06/23/2004 | EP1431584A2 Multi-stage electric pump |
| 06/16/2004 | CN1153906C Turbo-compressor device |
| 06/02/2004 | EP1423612A1 Improved pitot tube insert |
| 05/20/2004 | US20040096324 High pressure rotary pump in a pot housing with a pressure cap |
| 05/20/2004 | US20040096320 Multistage submersible axial-flow pump |
| 05/19/2004 | EP1420166A1 High pressure centrifugal pump housing with pressure cover |
| 05/19/2004 | CN2616721Y Segmental multi-stage centrifugal water pump |
| 05/19/2004 | CN2616720Y High-speed multistage centrifugal water pump |
| 05/13/2004 | WO2004040144A1 Electric motor pump for swimming pool maintenance |
| 05/13/2004 | US20040091352 Attachment of bearing elements by deformation |
| 05/06/2004 | US20040086393 Two-stage pump with high head and low delivery |
| 05/06/2004 | EP1416162A2 Two-stage pump with high head and low delivery |
| 05/06/2004 | EP1059455B1 A centrifugal pump formed by pressing and welding and its manufacturing process |
| 04/29/2004 | WO2003086565A3 Apparatus and method for continuously removing air from a mixture of ground polyurethane particles and a polyol liquid |
| 04/27/2004 | US6726449 Pump diffuser anti-spin device |
| 04/27/2004 | CA2295932C Improved rotor for blood pump |
| 04/27/2004 | CA2117343C Multiphase fluid treatment |
| 04/15/2004 | WO2004031591A1 Low-noise pump cooled by the pumped water |
| 04/15/2004 | US20040071545 Diffuser for a turbo pump |
| 04/08/2004 | US20040067133 Turbo pump |
| 03/31/2004 | EP1033493A4 Stage in a submerged multiple-stage pump |
| 03/24/2004 | CN1483938A Multi-impeller high suction depth centrifugal water pump |
| 03/23/2004 | US6710469 Fluid-powered energy conversion device |
| 03/23/2004 | US6709227 Pitot tube insert |
| 03/17/2004 | CN1142370C 泵装置 Pump device |
| 03/11/2004 | US20040047728 Impeller for gassy well fluid |
| 03/10/2004 | CN2606202Y Improved two-stage centrifugal pumps |
| 02/25/2004 | EP1391597A2 Noise reduction conduit for static components in aircraft engines |
| 02/25/2004 | EP1390620A1 Stage housing constructed from multiple metal sheets |
| 02/25/2004 | EP1023537B1 Lubricating system, preferably for refrigerating machinery and comprising a pitot tube pump |
| 02/25/2004 | CN2604542Y Multistage centrifugal pump |
| 02/24/2004 | CA2391110C Multiphase fluid treatment |
| 02/10/2004 | CA2316909C A centrifugal pump formed by pressing and welding and its manufacturing process |
| 01/21/2004 | CN2600618Y Low ratio speed punching welding moulding horizontal double-stage centrifugal pump |
| 01/15/2004 | WO2004005722A1 A regenerative fluid pump and stator for the same |
| 01/13/2004 | US6676366 Submersible pump impeller design for lifting gaseous fluid |
| 01/08/2004 | WO2004003390A1 Restraining device for fan blade root |
| 12/31/2003 | WO2004001222A1 Impeller for compact turbo machines |
| 12/30/2003 | US6669439 Variable flow impeller-type water pump with movable shroud |
| 12/25/2003 | US20030235506 Dipping type pump where discharging performance at a time of actuation has been improved |
| 12/25/2003 | US20030233937 Deaerator having an inlet to receive a mixture of liquid and fine particles and an outlet to disperse the mixture |
| 12/24/2003 | CN2594496Y Volute integral radiative charge pump |
| 12/17/2003 | CN2592905Y Submersible electric pump for removing axial force |
| 12/17/2003 | CN1131379C Centrifugal pump formed by pressing and welding and its mfg. process |
| 12/10/2003 | EP0920592B1 Pump with a shaft sealing system |
| 12/10/2003 | CN2591279Y Centripetal automatic balancing water pump |
| 12/03/2003 | CN1129717C Drainage pump |
| 11/27/2003 | WO2003098051A1 Air extractor with a removable front lid |
| 11/27/2003 | WO2003098050A1 Self-opening air extractor |
| 11/27/2003 | WO2003098049A1 Multistage pump, particularly of the immersion type |
| 11/27/2003 | US20030219347 Horizontal centrifugal pumping system |
| 11/26/2003 | CN2588081Y Centrifugal multi-stage mud pump |
| 11/20/2003 | WO2003095842A1 Driving motor, especially for a pump |
| 11/18/2003 | CA2249081C Liquid petroleum gas submersible electric motor driven pump and drive coupling therefor |
| 11/05/2003 | EP1147318B1 Power driven device with centrifugal fluid circulation, such as a motor pump or a motor compressor |
| 11/04/2003 | CA2319607C A roto-dynamic high pressure machine |
| 10/30/2003 | WO2003089788A1 Centrifugal pump with switched reluctance motor drive |
| 10/30/2003 | CA2478349A1 Centrifugal pump with switched reluctance motor drive |
| 10/28/2003 | US6638007 Turbomachine with radial-flow compressor impeller |
| 10/23/2003 | WO2003086565A2 Apparatus and method for continuously removing air from a mixture of ground polyurethane particles and a polyol liquid |
| 10/23/2003 | US20030198563 Centrifugal pump with switched reluctance motor drive |
| 10/21/2003 | CA2312085C Cooling means for the motor of a turbocompressor |
| 10/08/2003 | EP0837989B1 A rotor |