| Patents for F04D 17 - Radial-flow pumps specially adapted for elastic fluids, e.g. centrifugal pumps; Helico-centrifugal pumps specially adapted for elastic fluids (4,320) |
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| 02/21/1991 | DE4023261A1 Cross-flow fan with fixed guide blade - involves bolt to attach blade to impeller |
| 02/21/1991 | DE4023260A1 Heat exchanger system with cross-flow fan - incorporates dividing wall movable about swivel axis |
| 02/21/1991 | DE4023258A1 Blocking reverse motion in cross-flow fan - involves use of pre-sprung blocking elements |
| 02/14/1991 | DE3926456A1 Geblaese mit einem elektromotor Fan with an electric motor |
| 02/07/1991 | WO1991001450A1 Radial-flow fan unit fitted inside an air-intake duct |
| 02/07/1991 | DE4021316A1 Axial delivery fan for box-shaped housing - with provision of deflection plate to improve efficiency |
| 02/06/1991 | EP0258440B1 Rotor of centrifugal compressor |
| 01/30/1991 | CN2070371U Water/blow two-purpose centrifugal pump |
| 01/30/1991 | CN1011436B Multi-stage pump |
| 01/29/1991 | US4988239 Multiple-choke apparatus for transporting and metering particulate material |
| 01/24/1991 | DE3926152A1 Blade configuration in radial compressor - involves method of setting inclination of guide blades |
| 01/24/1991 | DE3923874A1 Ventilator with motor driven bladed wheel - involves formation of axial flow channel to improve performance |
| 01/23/1991 | CA2021288A1 Device for conveying a gaseous medium |
| 12/27/1990 | WO1990015581A1 Dental system |
| 12/12/1990 | EP0401741A1 Two stage primary dry pump |
| 11/20/1990 | CA1276416C Air blower assembly for vacuum cleaners |
| 11/13/1990 | US4969803 Compressor unit |
| 11/01/1990 | WO1990012963A1 High capacity, high efficiency pump |
| 09/05/1990 | EP0242248B1 Radial ventilator, especially for motor vehicle air conditioning |
| 09/05/1990 | CN2061624U Radial air exhauster |
| 08/23/1990 | WO1990009526A1 Centrifugal fan with airfoil vanes in annular volute envelope |
| 08/22/1990 | EP0382845A1 Radial ventilator |
| 08/08/1990 | CN1044519A Cross-flow fan |
| 08/08/1990 | CN1009126B Turbine fan with coder |
| 08/07/1990 | US4946348 Centrifugal fan with airfoil vanes in annular volute envelope |
| 08/01/1990 | CN2059943U Three-component inlet blade centrifugal ventilator |
| 07/25/1990 | CN1044153A Real pressure low-noise industrial blower |
| 07/18/1990 | EP0377847A1 High-pressure fan |
| 07/18/1990 | CN2059467U Centrifugal ventilator with adjustable tail fins |
| 07/03/1990 | US4938661 Multistage centrifugal compressor |
| 06/28/1990 | DE3843463A1 Blower for the conveyance of gases |
| 06/27/1990 | EP0375198A2 Supersonic centrifugal compressor |
| 06/26/1990 | US4936288 Exhaust device for kitchen hood, air purifier and the like, and hood comprising such a device |
| 06/20/1990 | CN1008468B Vortex and centrifugal compound air-pump |
| 06/06/1990 | CN2057972U Dust-removing fan |
| 06/06/1990 | CN1042758A Centrifugal compressor with horizontal dismountable plane |
| 06/05/1990 | US4930978 Compressor stage with multiple vented inducer shroud |
| 05/30/1990 | CN1042590A Radial-flow fan |
| 05/29/1990 | US4929149 Gas blower |
| 05/17/1990 | DE3838149A1 Supercharging system for an internal combustion engine |
| 05/16/1990 | CN2057057U High pressure fan for cigarette making machine with tobacco twig speed of 140m/2min. |
| 05/15/1990 | US4925368 Turbo-compressor having air-cooled bearing |
| 05/09/1990 | CN1041992A Multistage centrifugal compressor |
| 05/08/1990 | CA1268747A1 Screw rotors |
| 04/25/1990 | CN1041639A 离心通风机 Centrifugal Fan |
| 04/24/1990 | CA1268078A1 Pump or compressor unit |
| 04/19/1990 | DE3835341A1 Centrifugal compressor with horizontal joint face |
| 04/17/1990 | US4917572 Centrifugal blower with axial clearance |
| 04/10/1990 | US4915583 Radial-flow fan in particular for the air-conditioning of a motor vehicle |
| 04/03/1990 | US4913622 Cross flow fan system |
| 03/21/1990 | EP0359514A2 Multistage centrifugal compressor |
| 03/21/1990 | CN2054849U Noise control of double-stage liquid circulating vaccum-pump |
| 03/21/1990 | CN1040661A Centrifugal compressor with inner tank of sealing oil |
| 03/08/1990 | DE3828852A1 Ventilating device |
| 02/28/1990 | CN2053688U Centrifugal ventilator |
| 02/27/1990 | US4904155 Vacuum pump |
| 02/20/1990 | US4902196 Gas-moving device |
| 02/08/1990 | DE3922782A1 Molecular pump in a unit design |
| 02/07/1990 | CN1039470A Contrifugal pressure expanding propeller |
| 01/24/1990 | CN1039087A Device for extending performance of radial compressor |
| 01/17/1990 | CN2051297U Flexible-blade compressor for refrigeration |
| 01/11/1990 | WO1990000229A1 Improved mixed-type compressor and applications |
| 01/10/1990 | EP0350408A2 Suction device for kitchen extractor, air cleaner and extractor containing such a device |
| 01/10/1990 | CN2050893U Centrifugal ventilator |
| 01/10/1990 | CN2050892U Centrifugal ventilator |
| 01/10/1990 | CN2050891U Centrifugal ventilator |
| 01/03/1990 | EP0349051A1 Mixed flow compressor and its uses |
| 01/02/1990 | US4890598 High efficiency blower |
| 12/28/1989 | WO1989012753A1 Multi-stage turbo-compressor |
| 12/27/1989 | EP0348342A1 Centrifugal machine with opposing rotation impellers |
| 12/14/1989 | WO1989012171A1 Centrifugal compressor with a container for sealing oil |
| 12/14/1989 | WO1989012170A1 Method and apparatus for processing fluids |
| 12/13/1989 | CN2049286U Special water ring vacuum-pump for concrete vacuum suction machine |
| 12/12/1989 | USRE33129 Vacuum pump |
| 12/06/1989 | EP0345080A2 Molded multi-part generator fan |
| 11/30/1989 | WO1989011596A1 Radial ventilator |
| 11/29/1989 | CN2048557U Gas booster |
| 11/29/1989 | CN2048526U 吹风机 Hair dryer |
| 11/22/1989 | CN2048132U Centrifugal ventilator |
| 11/07/1989 | US4879483 Molded multi-part generator fan |
| 10/25/1989 | CN2046560U Centrifugal air machine |
| 10/18/1989 | CN1036437A Fun of cylindrical rotor with multiple-blades |
| 09/26/1989 | CA1261561A1 Quiet by-pass vacuum motor |
| 09/20/1989 | CN2044655U Centrifugal air pump with sealed wind-shielding ring of single plate |
| 09/08/1989 | WO1989008191A1 Biaxial contrarotating centrifugal fluid pressure booster |
| 08/22/1989 | US4859888 Cross flow type cooling fan device |
| 08/10/1989 | WO1989007202A1 Device for pumping a fluid medium |
| 08/09/1989 | EP0327507A2 Device for the purification of air |
| 07/19/1989 | CN1034043A Cylindrical fan with multiple vanes |
| 07/11/1989 | US4845941 Gas turbine engine operating process |
| 07/05/1989 | CN1033678A Multi-stage pump |
| 07/04/1989 | US4843813 Compact turbocompressor unit |
| 06/06/1989 | US4836743 Cross flow fan |
| 05/16/1989 | US4830584 Pump or compressor unit |
| 05/16/1989 | US4829625 Portable vacuum cleaner/air compressor with light |
| 04/26/1989 | CN1032575A Casing for crossflow fan |
| 04/26/1989 | CN1032574A Runoff type molecule pump |
| 04/25/1989 | US4824333 Air blower assembly for vacuum cleaners |
| 03/28/1989 | US4815930 Cavitating centrifugal pump |
| 03/08/1989 | EP0305700A2 Compressor unit |