| Patents for F04D 1 - Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (3,447) |
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| 10/29/1998 | WO1998048167A2 Mechanism for providing motive force and for pumping applications |
| 10/29/1998 | CA2286095A1 Mechanism for providing motive force and for pumping applications |
| 10/28/1998 | CN2295859Y Mixing pump for dyeing apparatus |
| 10/28/1998 | CN1197167A Oilless lubricuting energy saving pump |
| 10/22/1998 | WO1998046879A1 Bearing and seal-free blood pump |
| 10/21/1998 | CN1196450A Method for building high flow low velocity flow field and device for transporting fluid using said method |
| 10/15/1998 | WO1998045599A1 Freeze tolerant rotating fluid management device |
| 10/15/1998 | CA2286650A1 Freeze tolerant rotating fluid management device |
| 10/14/1998 | CN2294345Y Double suction type self-suction centrifugal pump |
| 09/30/1998 | EP0837989A4 A rotor |
| 09/30/1998 | CN2292922Y Superminiature high-efficiency centrifugal pump for sprayer |
| 09/30/1998 | CN2292921Y Leakless multistage centrifugal pump |
| 09/30/1998 | CN2292920Y Centrifugal water pump |
| 09/23/1998 | EP0619860B1 Multiphase fluid treatment |
| 09/22/1998 | CA2046465C Multi-stage centrifugal pump |
| 09/16/1998 | CN1193377A 叶轮 Impeller |
| 09/15/1998 | US5807067 Transtator hydraulics device |
| 09/09/1998 | CN2290714Y Liquid working medium self-filling sealing centrifugal pump |
| 09/09/1998 | CN2290713Y Angle conversion centrifugal pump |
| 09/02/1998 | CN1191941A Water pump property changing method and water pump with optimized configuration |
| 08/26/1998 | CN2289079Y Barrel sectional multi-stage centrifugal pump |
| 08/19/1998 | CN2288295Y Single-stage single-suction centrifugal pump |
| 08/18/1998 | CA2059392C Pressure and recirculating pump |
| 07/29/1998 | CN2286808Y Full-plastic mini-sized water pump |
| 07/28/1998 | US5785504 Pump with separate pumping stages for pumping a plurality of liquids |
| 07/28/1998 | CA2093768C Centrifugal oil pump booster |
| 07/08/1998 | CN2285838Y Non-clogging single-stage double-suction centrifugal pump |
| 07/08/1998 | CN2285837Y Vacuum priming self-suction centrifugal pump |
| 06/24/1998 | CN2284869Y Deep-well water pump |
| 06/24/1998 | CN1185558A Hot water circulating pump selectively supplying hot-water through a pair of tube |
| 06/23/1998 | US5769069 Low flow-rate pump |
| 06/17/1998 | EP0847498A1 Regenerative pump |
| 06/17/1998 | CN2284302Y Rotor floating blade oil pump |
| 06/17/1998 | CN1184896A Hydraulic vacuum air compress aerostatic press |
| 06/16/1998 | US5765628 Freeze tolerant rotating fluid management device |
| 06/10/1998 | CN1184177A Device for pumping water in washing machine |
| 05/20/1998 | CN2282084Y 不锈钢卫生泵 Stainless steel sanitary pumps |
| 05/20/1998 | CN2282083Y 水冷式鼓风机 Water-blower |
| 05/19/1998 | US5752803 High pressure centrifugal slurry pump |
| 05/13/1998 | CN2281431Y Water supplying pump for pressure boiler |
| 05/07/1998 | DE19745737A1 Warmwasser-Umwälzpumpe zum Liefern von Warmwasser selektiv durch ein Paar von Rohren Hot water circulating pump selectively for supplying hot water by a pair of tubes |
| 05/06/1998 | CN2280785Y Self-suction type water pump |
| 04/29/1998 | EP0837989A1 A rotor |
| 04/28/1998 | CA2054729C Flow generating apparatus and method of manufacturing the apparatus |
| 04/15/1998 | EP0836010A1 Drainage pump |
| 04/01/1998 | CN2277460Y Improved single-stage double-suction centrifugal pump |
| 03/31/1998 | US5733065 Underground drainage facility, vertical-shaft multi-stage adjustable vane pump, and method of running drainage pump |
| 03/25/1998 | EP0830512A1 Low flow-rate pump |
| 03/18/1998 | CN2276574Y Unit-construction type single stage pump |
| 03/18/1998 | CN2276573Y Multifunction centrifugal pump |
| 03/18/1998 | CN2276572Y Segmental opposed voluted type multistage slag thick liquid pump |
| 03/11/1998 | CN2276085Y Volume regulating and controlling device for gas pressurizer |
| 03/04/1998 | CN2275652Y New structure of hydraulic speed regulating pump for supplying water |
| 03/03/1998 | US5722812 Abrasion resistant centrifugal pump |
| 02/26/1998 | WO1998007990A1 Pump shaft sealing system |
| 02/25/1998 | CN2275169Y Half open type impeller pipe line automatic booster pump |
| 02/17/1998 | US5718564 Centrifugal pump with adaptor for various valves |
| 02/11/1998 | EP0823026A1 Medical fluid pump |
| 01/21/1998 | EP0819330A1 Rotary machine with an electromagnetic rotary drive |
| 01/08/1998 | WO1998000642A1 A movable inlet gas barrier for a free surface liquid scoop |
| 01/08/1998 | CA2258600A1 A movable inlet gas barrier for a free surface liquid scoop |
| 01/07/1998 | EP0728262B1 Multistage centrifugal pump with canned magnetic bearing |
| 01/07/1998 | CN1036941C 离心泵 Centrifugal |
| 01/06/1998 | US5704761 Full-circumferential flow pump |
| 01/06/1998 | US5704326 For guiding a flow of air |
| 01/06/1998 | CA2107933C Multi-stage pump for pumping various liquids |
| 12/31/1997 | CN2271624Y Floating drainage and irrigation equipment |
| 12/17/1997 | CN2270832Y Deep-well pump device |
| 12/10/1997 | EP0711230B1 Nautical propulsion device |
| 12/03/1997 | CN2269483Y Booster water turbine pump for oil field water injection |
| 11/26/1997 | CN2268791Y One stage and one suction cantilever centrifugal pump |
| 11/26/1997 | CN1165919A Double-vane mixing self-sucking pump |
| 11/11/1997 | US5685700 Bearing and seal-free blood pump |
| 11/11/1997 | US5685691 Movable inlet gas barrier for a free surface liquid scoop |
| 10/23/1997 | CA2253195A1 5 or 8kw refrigerating system and centrifugal compressor assembly for s aid system |
| 10/22/1997 | CN2265446Y High-speed composite impeller centrifugal pump |
| 10/08/1997 | CN2264265Y 螺旋离心吸沙泵 Screw centrifugal sand suction pump |
| 09/17/1997 | EP0795689A1 Multiphase fluid treatment |
| 09/10/1997 | EP0793768A1 Fluid pump with integral filament-wound housing |
| 09/03/1997 | CN2261521Y High speed energy saving oil pump of transformer |
| 08/28/1997 | DE19607292A1 Housing with stage guide for multistage centrifugal pump |
| 08/20/1997 | CN1157600A Hydrojet |
| 08/14/1997 | WO1997029286A1 A centrifugal pump device |
| 08/13/1997 | CN2259512Y Electromechanical integral clear water pump |
| 08/13/1997 | CN2259511Y Centrifugal pump for delivering fluid agent |
| 08/06/1997 | CN2258925Y Self-priming booster jet pump |
| 08/06/1997 | CN2258924Y Self-priming jet pump |
| 07/30/1997 | CN2258548Y Helico pump for boiler water supply |
| 07/30/1997 | CN2258427Y Four-purpost combined machine for milling, crushing, grinding and pumping |
| 07/30/1997 | CN1155630A Turbomachinery with variable-angle fluid guiding vanes |
| 07/22/1997 | US5649425 Turboexpander pump unit |
| 07/02/1997 | EP0781929A1 Device for pumping or compressing a multi-phase fluid comprising tandem blading |
| 06/04/1997 | CN2255513Y Quick water-inducing centrifugal pump |
| 06/04/1997 | CN1035080C Double centrifugal fluid transporting method and its appliance |
| 06/03/1997 | US5634740 Large-depth underground drainage facility and method of running same |
| 05/28/1997 | EP0775829A1 Turbomolecular vacuum pumps |
| 05/28/1997 | EP0775828A1 Turbomolecular vacuum pumps |
| 05/28/1997 | EP0775066A1 Hydrojet |
| 05/14/1997 | CN1149675A Submersible pump |
| 05/02/1997 | EP0770781A1 Turbomolecular vacuum pumps |