| Patents for F04D 7 - Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts (4,105) |
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| 01/07/1992 | CA2003534C Attachment for an oil well screw pump system |
| 01/03/1992 | WO1992000440A1 Rotary disc pump |
| 01/01/1992 | CN2091972U Leakless anti-corrosion pump |
| 01/01/1992 | CN2091971U 分离泵 Separate pump |
| 12/31/1991 | US5077000 Method of preparing a reactor coolant pump for vacuum degasification of a reactor coolant system |
| 12/31/1991 | US5076757 High head centrifugal slicing slurry pump |
| 12/26/1991 | WO1991018209A3 Liquid pump |
| 12/25/1991 | CN2091370U No-discharging pump with fluoroplastics lining |
| 12/18/1991 | CN1015126B Vertical automatic full liquid priming type centrifugal pump |
| 12/17/1991 | US5073335 Bwr turbopump recirculation system |
| 12/17/1991 | US5072590 Water dispenser station |
| 12/16/1991 | CA2040678A1 Slurry pump apparatus and method |
| 12/12/1991 | WO1991019102A1 Pumping liquid metals |
| 12/07/1991 | CA2018506A1 Pumping liquid metals |
| 11/28/1991 | WO1991018209A2 Liquid pump |
| 11/27/1991 | CN2089538U Fluorine lined anti-corrosion centrifugal pump |
| 11/13/1991 | EP0260320B1 Cartridge pump |
| 10/30/1991 | EP0340236A4 Improved pump construction |
| 10/22/1991 | US5058615 Method and apparatus for pumping high consistency pulp |
| 10/17/1991 | DE4012041A1 High pressure centrifugal pump for abrasive slurries - has outer cover of high strength ductile material mounted adjacent to pump housing |
| 10/09/1991 | CN2086330U Moving mud pump |
| 10/09/1991 | CN2086329U Centrifugal sand pump |
| 10/09/1991 | CN2086328U Anti-stop thick mud pump |
| 09/18/1991 | EP0447106A2 Improved nuclear reactor coolant pump with internal self-cooling arrangement |
| 09/11/1991 | EP0445247A1 Anti-flooding sewage grinder pump liquid level control system in separately mounted canister |
| 09/04/1991 | EP0445092A1 Pump impeller with mixer |
| 09/04/1991 | CN2084115U Anti-corrosive swirl pump |
| 09/03/1991 | US5044566 Sewage pump with self-adjusting cutters |
| 08/29/1991 | CA2036945A1 Pump impeller with mixer |
| 08/28/1991 | EP0442883A1 Turbine |
| 08/28/1991 | CN1054120A Heavy corrosion-resistant power saving high efficient centrifugal pump |
| 08/21/1991 | CN1013610B Transition duct for centrifugal fan |
| 08/14/1991 | DE4104282A1 Pump designed to handle wet cement - has screen conveyor connected to serpentine rotor mounted in stator |
| 08/14/1991 | CN2082776U Vertical external pump with fluoroplastic lining |
| 08/13/1991 | US5039320 Apparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material |
| 08/07/1991 | EP0440455A1 A method and an apparatus for separating gas from a suspension containing gas |
| 08/07/1991 | EP0440046A1 Submerged pump |
| 07/31/1991 | CN2081905U Helical centrifugal pump |
| 07/30/1991 | CA1286916C Centrifugal pump for handling liquids carrying solid abrasive particles |
| 07/17/1991 | CN2081000U Full-plastic submersible pump |
| 07/16/1991 | CA1286151C Impeller for centrifugal pumps |
| 07/10/1991 | CN2080578U Sand pump with rubber liner |
| 07/10/1991 | CN2080577U Liner self-priming pump |
| 07/02/1991 | US5028211 Torque coupling system |
| 06/27/1991 | CA2032642A1 Shaft seal for slurry pumps (2) |
| 06/19/1991 | CN2079229U Vertical centrifugal mud pump |
| 05/29/1991 | CN2077916U Acid and alkali pumps sealed by negative-pressure |
| 05/29/1991 | CN2077915U Underneath water-pump |
| 05/28/1991 | US5019136 Method and apparatus for separating gas with a pump from a medium being pumped |
| 05/21/1991 | US5016825 Grinding impeller assembly for a grinder pump |
| 05/21/1991 | CA1284285C Device for pumping highly-viscous material, in particular thick oil |
| 05/15/1991 | EP0427608A1 Device for preventing the deposition of impurities inside apparatuses which are not directly accessible |
| 05/15/1991 | CN2077048U Non-blinding pump |
| 04/30/1991 | US5011370 Centrifugal pump |
| 04/18/1991 | WO1991005168A1 Pump impeller |
| 04/16/1991 | US5007798 Centrifugal pump |
| 04/10/1991 | EP0303641B1 Transport ventilator |
| 04/10/1991 | CN1050583A Anti-flooding sewage grinder pump liqucd level control system in separately mounted canister |
| 04/03/1991 | CN2074384U New-type slurry pump |
| 03/26/1991 | WO1991004099A1 Anti-flooding sewage grinder pump liquid level control system in separately mounted canister |
| 03/26/1991 | CA2042050A1 Anti-flooding sewage grinder pump liquid level control system in separately mounted canister |
| 03/21/1991 | DE4001523A1 Sewer system tank emptying mechanism - has vacuum pump following waste water discharge pump |
| 03/20/1991 | EP0276224B1 Device for pumping highly-viscous material, in particular thick oil |
| 03/20/1991 | CN1050079A Centrifugal pump housing constructed of sheet metal |
| 03/19/1991 | US5000658 Apparatus for pumping high consistency fiber suspension |
| 03/12/1991 | US4998861 Drainage pump |
| 03/08/1991 | WO1991003649A1 Sheet metal pump casing |
| 03/06/1991 | EP0288500B1 Impellers for centrifugal pumps |
| 02/19/1991 | US4994017 Circulation apparatus |
| 02/13/1991 | CN2071268U Verticle vortex flow impurity pump |
| 01/23/1991 | EP0409456A2 Pump with separate fluidizing vaned shaft adjacent impeller |
| 01/15/1991 | US4984966 Method of making liner |
| 01/15/1991 | US4984601 Unit apt to act upon the flow |
| 01/02/1991 | CN2068610U Suspension centrifugal mud pump |
| 01/01/1991 | US4981413 Pump for and method of separating gas from a fluid to be pumped |
| 01/01/1991 | US4981304 Reactor coolant pump auxiliary flexible vacuum seal for reactor coolant system vacuum degasification |
| 12/25/1990 | US4979875 Centrifugal pump for the delivery of hot liquids |
| 12/19/1990 | EP0403049A2 An assembly for facilitating inservice inspection of a reactor coolant pump rotor |
| 12/18/1990 | CA1277868C Pump construction |
| 12/13/1990 | WO1990015183A1 Method of and apparatus for separating heavy impurities from fiber suspensions in connection with pumping |
| 12/12/1990 | CN2067334U Special acid-dripping pump for infusion bottle |
| 12/12/1990 | CN2067333U High-corrosion-resistant energy-saving high-efficiency centrifugal pump |
| 12/11/1990 | US4976586 Pump with separate fluidizing vaned shaft adjacent impeller |
| 12/11/1990 | CA1277542C Pulp centrifugal pump |
| 11/28/1990 | CN1047369A Asphalted oil pump to against overflow |
| 11/22/1990 | EP0398005A2 Pump |
| 11/20/1990 | US4971519 Method and apparatus for pumping high consistency medium |
| 10/31/1990 | EP0395604A1 Centrifugal pump |
| 10/31/1990 | EP0395236A1 Pump for separating gas from a fluid to be pumped |
| 10/31/1990 | EP0395234A1 Pump with seal cooling means |
| 10/24/1990 | CN2064430U Centrifugal pump with fluoroplastic alloy bush |
| 10/16/1990 | US4963065 Centrifugal pump for pulverized material |
| 10/10/1990 | EP0391288A2 Pumping apparatus |
| 10/09/1990 | US4961678 Reactor coolant pump having double dam seal with self-contained injection pump mechanism |
| 09/26/1990 | EP0389149A1 Molten metal pump |
| 09/26/1990 | CN2062766U Spraying and lubricating device for sludger |
| 09/25/1990 | US4958988 Motor driven pump for pumping viscous solutions |
| 09/19/1990 | EP0388004A1 Molten metal pump with filter |
| 09/12/1990 | CN2061983U Stator vibrating screw pump |
| 09/11/1990 | US4955787 Assembly for facilitating inservice inspection of a reactor coolant pump rotor |