| Patents for F04D 1 - Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (3,447) |
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| 10/12/1988 | CN87212169U Energy-saving double-volute self-priming pump |
| 10/11/1988 | US4776756 Pump |
| 09/14/1988 | CN87205264U Self hang type bottomless valve centrifugal pump |
| 08/31/1988 | CN86108707A Submerged-in-oil pump |
| 08/24/1988 | CN88210713U Wing shaped impeller type low ratio speeds centrifugal pump |
| 08/24/1988 | CN87205194U Improved circular centrifugal pump |
| 08/16/1988 | US4764086 Blower for circulating larger gas volumes, in particular for high-power laser systems |
| 08/16/1988 | US4764085 Blower for circulating larger gas volumes, in particular for high-power laser systems operating according to the gas-transportation principle |
| 08/03/1988 | CN87100216A Vertically outside installed underliquid pump |
| 07/20/1988 | CN86108774A Sealed impeller pump assembly |
| 06/30/1988 | WO1988004733A1 Centrifugal pump |
| 06/28/1988 | CA1238520A1 Seal-less pump |
| 06/15/1988 | CN87201871U Centrifugal pump with adjustable diameter of impeller |
| 06/08/1988 | CN87213755U Vertical chemical-engineering pump |
| 05/17/1988 | US4744733 Scroll type compressor with variable displacement mechanism |
| 05/11/1988 | CN87208777U Mini-pump for water heating system |
| 05/03/1988 | US4741668 Centrifugal pump stage with abrasion resistant impeller hub |
| 05/03/1988 | US4741664 Portable pump |
| 04/19/1988 | CA1235329A1 Direct coupling of a vortex injector to a centrifugal pump |
| 04/12/1988 | US4737072 Centrifugal pump |
| 03/22/1988 | US4732236 Liquid scavenging pump system |
| 03/09/1988 | CN87207494U Static-pressure balancer for a centrifugal pump |
| 03/01/1988 | CA1233365A1 Centrifugal pump |
| 02/25/1988 | DE3628074A1 Centrifugal pump with vertical axis - may be lowered into well and has tube with foot valve at bottom |
| 02/17/1988 | CN87200577U Centrifugal pump with self-absorbablity |
| 02/03/1988 | CN87203037U Close cooling pump of vehicle with single arc vane |
| 01/13/1988 | EP0172900B1 Plant for the transport and/or mixture of gas |
| 01/13/1988 | CN87202365U Oxygen-increasing device lifting water in different depths |
| 12/12/1987 | CN86208651U Immersible self-priming pump |
| 12/09/1987 | EP0248104A1 Rotary pump |
| 11/24/1987 | US4708801 Reverse flow to unplug |
| 11/24/1987 | US4708589 Roll-formed submersible pump |
| 11/24/1987 | US4708585 Centrifugal pump |
| 11/04/1987 | CN87202820U Corrosion-resistance sealed centrifugal pump |
| 11/04/1987 | CN86102777A Impeller for rotary fluid machinery |
| 11/03/1987 | US4704121 Anti-thrombogenic blood pump |
| 11/03/1987 | US4704071 Method and apparatus for pumping liquids |
| 10/21/1987 | CN87200309U Self-priming corrosion-proof shunt pump |
| 10/07/1987 | CN86210682U 离心泵 Centrifugal |
| 10/07/1987 | CN86208033U Small swirl pump |
| 09/30/1987 | CN85101651A Multistage centrifugal pump |
| 09/23/1987 | CN86208139U Miniature vertical centrifugal water pump |
| 09/09/1987 | EP0235392A1 Blower for the circulation of large volumes of gas, especially for high-power lasers |
| 09/02/1987 | CN86208470U Vertical liquid pump (under liquid level outside accumulator tank) |
| 09/01/1987 | US4690613 Portable engine-pump assembly |
| 08/25/1987 | US4688998 Blood pump |
| 08/19/1987 | EP0232546A1 Blower for the circulation of large volumes of gas, especially for gas transport principle high power lasers |
| 08/19/1987 | CN86209016U Magnetic submersible pump |
| 07/14/1987 | US4679980 Gravity insensitive inventory control device for a two-phase flow system |
| 07/01/1987 | CN86207461U Bottom valve for water pump |
| 06/30/1987 | US4676714 Reversible centrifugal pump |
| 06/30/1987 | US4676065 Exhaust system |
| 06/30/1987 | CA1223480A1 Pump apparatus |
| 06/24/1987 | EP0226294A1 Pitot tube for pitot type centrifugal pump |
| 06/23/1987 | US4674950 Pitot tube for pitot type centrifugal pump |
| 06/10/1987 | CN86204176U Multistage horizontal centrifugal pump with induced wheel |
| 06/03/1987 | CN86201301U Vacuum centrifugal thrust pump with helical blades |
| 06/02/1987 | US4669956 Multicellular pump with removable cartridge |
| 06/02/1987 | CA1222355A1 Anti-thrombogenic blood pump |
| 05/27/1987 | CN86209107U Miniature whirl type water pump |
| 05/27/1987 | CN86200548U Fluid dynamic sealing device for centrifugal pump not in use |
| 04/15/1987 | CN85102434A Valueless mediumless self-aspirating universal pump |
| 04/07/1987 | US4655681 Seal-less pump |
| 04/01/1987 | CN86105602A Turbocompressor with variable quantity mechanism |
| 03/10/1987 | US4648787 Apparatus for transporting and/or mixing gases |
| 03/04/1987 | CN85200672U 家用旋涡泵 Household vortex pump |
| 02/18/1987 | CN86205795U Vertical tandem multi-stage electric pump for water injection |
| 02/17/1987 | US4643652 Portable engine-pump assembly |
| 01/17/1987 | CN85101529A Cylindrical housing for a turbine |
| 01/14/1987 | CN85103948A Process and device for reducing gas content in liquid |
| 01/07/1987 | EP0207667A1 Pump |
| 01/02/1987 | DE3519284A1 Pumping installation |
| 12/30/1986 | EP0206759A1 Scroll type compressor |
| 11/12/1986 | CN86102781A Balancing-type rotary diversion case deep well phreatic water pump |
| 10/29/1986 | CN86202138U Pulse-free centrifugal pump |
| 10/22/1986 | EP0198421A1 Process and apparatus for filtering a suspension of particles in a liquid |
| 10/08/1986 | CN85203134U Soft case valve |
| 06/24/1986 | US4596511 Eddy pump |
| 04/16/1986 | EP0178002A1 Centrifugal pump |
| 03/11/1986 | CA1201623A1 Centrifugal pump having semi-axial diffusion and dual discharge for hydromassage bathtub units |
| 03/05/1986 | EP0173030A2 A seal-less pump |
| 03/05/1986 | EP0172900A1 Plant for the transport and/or mixture of gas. |
| 02/19/1986 | EP0172102A1 Multistage pump with dismountable cartridge |
| 02/12/1986 | EP0171143A2 Pump |
| 02/12/1986 | EP0171094A1 A method of driving the impeller of a liquid pump |
| 01/16/1986 | WO1986000369A1 Positive displacement apparatus of the scroll type |
| 12/19/1985 | EP0145738A4 Centrifugal pump. |
| 12/04/1985 | EP0163434A2 Pump with hydrostatic bearing |
| 10/29/1985 | US4549861 Rotating positive displacement scroll apparatus with lubricating pump |
| 10/22/1985 | US4548545 Centrifugal pump with deaeration chamber |
| 08/29/1985 | WO1985003745A1 Plant for the transport and/or mixture of gas |
| 07/09/1985 | US4527517 Water pump for reciprocating piston internal combustion engine |
| 07/02/1985 | CA1189693A1 Apparatus for forming an element-free gap in a continuous slide fastener chain |
| 06/26/1985 | EP0145738A1 Centrifugal pump. |
| 06/04/1985 | CA1188153A1 Full admission pitot pump |
| 04/16/1985 | US4511312 Method of driving the impeller of a liquid pump by means of a brushless a.c. motor; and a liquid pump for carrying out the method |
| 04/11/1985 | WO1985001436A1 Anti-thrombogenic blood pump |
| 03/20/1985 | EP0134361A1 Apparatus and method for withdrawing fluid from a zone |
| 01/29/1985 | US4496281 Centrifugal pump |
| 01/15/1985 | CA1181048A1 Compressor oil pump |