| Patents for F04D 1 - Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (3,447) |
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| 07/14/1999 | CN2328815Y Double stage parallel fire fighting pump |
| 07/14/1999 | CN2328814Y Direction changeable single stage single suction centrafugal pump |
| 07/14/1999 | CN1222653A Centrifugal pump |
| 07/13/1999 | US5921750 Compact interbowl assembly coupler for vertical turbine pumps |
| 07/07/1999 | CN2327813Y Centrifugal pump with overload protector |
| 07/07/1999 | CN2327812Y 水泵 Pump |
| 06/30/1999 | CN2326763Y Overlapped-rings centrifugal sealed water pump |
| 06/23/1999 | CN2325563Y Emergency fire fighting pump used in ship |
| 06/23/1999 | CN2325562Y 叶片泵 Vane pump |
| 06/23/1999 | CN2325561Y Strong self-suction type centrifugal pump |
| 06/23/1999 | CN1220351A Drainage pump |
| 06/09/1999 | EP0920592A1 Pump shaft sealing system |
| 06/03/1999 | WO1999027257A2 Stage in a submerged multiple-stage pump |
| 06/02/1999 | DE19752877A1 Molecular impulse pressure pump for linear increase of pressure, quantity and speed efficiency |
| 06/02/1999 | CN2321961Y Centrifugal type heat-pump device for steam mixing machine |
| 06/02/1999 | CN2321960Y Self-suction dirty-discharging pump |
| 06/02/1999 | CN1218148A Pump impeller |
| 05/27/1999 | WO1999025980A1 High speed self-lubricated fuel pump with hydrostatic bearings |
| 05/26/1999 | CN2320823Y Hand electric oil drum pump |
| 05/26/1999 | CN2320822Y Large blowing rate inserted centrifugal fan |
| 05/26/1999 | CN1217435A Pump vane |
| 05/19/1999 | EP0916852A1 A pump impeller |
| 05/19/1999 | EP0916851A1 A pump impeller |
| 05/19/1999 | EP0916850A1 Casing for aggregate containing a high pressure fluid |
| 05/12/1999 | CN2318433Y Improved centrifugal pump |
| 05/12/1999 | CN2318432Y Strong self-suction multi-stage centrifugal water pump with suction and exhaust device |
| 05/12/1999 | CN2318431Y Strong self-suction centrifugal water pump fitted with suction and exhaust device |
| 05/06/1999 | WO1999022144A1 Pitot tube pump having axial-stabilizing construction |
| 05/05/1999 | CN2317339Y Pump structure |
| 05/05/1999 | CN1216098A 5 or 8 kw refrigerating system and centrifugal compressor assembly for said system |
| 04/28/1999 | CN2316490Y Symmetric interchange type fast thread detaching and mounting dual-purpose centrifugal water pump |
| 04/27/1999 | CA2145857C Sealless rotodynamic pump |
| 04/22/1999 | WO1999019627A1 Lubricating system, preferably for refrigerating machinery and comprising a pitot tube pump |
| 04/21/1999 | CN2315336Y Self water supply type external motive power apparatus |
| 04/21/1999 | CN1214415A Pump with storage tank |
| 04/14/1999 | EP0908628A2 Pump with storage tank |
| 04/14/1999 | EP0907829A1 A movable inlet gas barrier for a free surface liquid scoop |
| 04/14/1999 | CN2314129Y Multifunctional pipeline pump with high coaxality |
| 04/13/1999 | US5893703 Pump shaft sealing system |
| 04/08/1999 | WO1999017024A1 A turbo type fluid machinery |
| 04/08/1999 | WO1999017022A1 A fluid machinery, a flange for fluid machinery, and a method for manufacturing them |
| 04/07/1999 | CN2313083Y Self-suction centrifugal pump |
| 03/31/1999 | EP0905379A1 Centrifugal pump and centrifugal pump arrangement |
| 03/30/1999 | US5888053 Pump having first and second outer casing members |
| 03/24/1999 | CN2311646Y Horizontal centrifugal pump bearing oil lubrication structure |
| 03/24/1999 | CN2311637Y Two-phase fluid pump |
| 03/24/1999 | CN2311636Y Glass fiber reinforced plastics corrosion resistant pump |
| 03/24/1999 | CN2311635Y Combined water pump |
| 03/23/1999 | US5885058 Multiphase fluid pumping or compression device with blades of tandem design |
| 03/17/1999 | CN2310880Y Agricultural submersible spray pump |
| 03/17/1999 | CN2310876Y Vertical electric auto-control self-priming pump in well |
| 03/17/1999 | CN2310875Y Pressure pump with pressure preset device |
| 03/10/1999 | CN2310184Y Single-stage suction type cantilever condensation pump |
| 03/03/1999 | CN2309447Y Vertical double-absorption centrifugal pump |
| 03/03/1999 | CN1209509A Method for increasing pumping-effciency and reducing specific gravity |
| 02/27/1999 | CA2241508A1 Pitot tube pump |
| 02/24/1999 | CN2308743Y 紧凑型卧式离心泵 Compact horizontal centrifugal pump |
| 02/24/1999 | CN2308742Y Ti welded centrifugal pump |
| 02/24/1999 | CN2308741Y Self-sucking centrifugal pump with air extracting wheel |
| 02/24/1999 | CN2308740Y High efficiency energy saving water drawing machine |
| 02/24/1999 | CN2308739Y Combined sealing chemical centrifugal pump |
| 02/23/1999 | US5873696 Fluid handling pump |
| 02/17/1999 | CN2307952Y Water pump with filter structure |
| 02/17/1999 | CN2307941Y Pump for outlet active water for crop |
| 02/17/1999 | CN2307938Y Axial separated type double-sucking centrifugal pump |
| 02/17/1999 | CN2307937Y Self-absorption blower pump for pipeline of running water |
| 02/17/1999 | CN1208126A Deep water pumping centrifugal pump system |
| 02/11/1999 | WO1999006711A1 Magnetic-drive assembly for a multistage centrifugal pump |
| 02/11/1999 | WO1998048167A3 Mechanism for providing motive force and for pumping applications |
| 02/10/1999 | CN2307130Y Reinforced plastic liquid flow pump |
| 02/10/1999 | CN2307129Y Spiral-flow type sewage drainage pump |
| 02/10/1999 | CN2307128Y Centrifugal pump |
| 02/10/1999 | CN2307127Y Flexible long axle water pump |
| 02/03/1999 | CN2306343Y Vertical hot water supplying pump for boiler |
| 02/03/1999 | CN2306342Y Water inlet locking unit joint-type water pump |
| 02/03/1999 | CN2306341Y Self-sucking type centrifugal pump |
| 01/20/1999 | CN2304771Y Tight sealed multi-stage eccentric pump |
| 01/20/1999 | CN2304770Y Double casing and multi-stage eccentric pump for light hydrocarbons |
| 01/20/1999 | CN1205398A Multifunctional pump |
| 01/19/1999 | CA2106861C Grit protector |
| 01/14/1999 | WO1999001663A1 Improved rotor for blood pump |
| 01/13/1999 | CN2303953Y Domestic blower pump convenient for fitting |
| 01/13/1999 | CN2303952Y Gas-liquid two-phase centrifugal pump |
| 01/12/1999 | US5857841 Full-circumferential flow pump |
| 01/06/1999 | CN2303102Y Multi-stage centrifugal pump with constant pressure |
| 01/06/1999 | CN2303101Y Up-side down type submersible pump |
| 12/30/1998 | CN2302357Y Low-noise radiator |
| 12/16/1998 | CN2300745Y Centrifugal pump |
| 12/09/1998 | CN2299952Y Double-sucking centrifugal pump |
| 12/08/1998 | US5846055 Structured surfaces for turbo-machine parts |
| 12/08/1998 | US5846052 High-pressure multistage pump |
| 12/08/1998 | US5845709 Recirculating pump for electrical submersible pump system |
| 12/02/1998 | CN2299172Y Gas/solid wear-resisting centrifugal fan |
| 12/02/1998 | CN2299171Y Combined centrifugal pipeline pump |
| 11/25/1998 | EP0879359A1 A centrifugal pump device |
| 11/19/1998 | DE19718283C1 Centrifugal pump for viscous, foamed and boiling liquids |
| 11/18/1998 | CN2297571Y Single stage centrifugal pump |
| 11/18/1998 | CN2297570Y 增压泵 Booster |
| 11/18/1998 | CN2297569Y Middle-high voltage quasi-ternary energy-saving centrifugal fan with single-plate vane |
| 11/04/1998 | CN2296112Y Sprinkler |