| Patents for F04F 1 - Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped (1,650) |
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| 11/10/1993 | EP0568742A1 Transfer of production fluid from a well |
| 11/09/1993 | CA2095764A1 Transfer of production fluid from a well |
| 10/28/1993 | WO1993021478A1 Compressing gas flowing through a conduit |
| 10/28/1993 | WO1993021477A1 Compressing combustible gas flowing through a conduit |
| 10/28/1993 | WO1993021419A1 Improved environmental vat |
| 10/13/1993 | CN1077255A Water-impacted liquid pump unit |
| 10/12/1993 | US5252192 Electrolytic pump |
| 09/28/1993 | US5248320 Compressing oxygen |
| 09/28/1993 | US5248243 Pneumatically operated and controlled fluid pump |
| 09/07/1993 | US5242272 Method and device for pumping a liquid at high temperature through a pipe |
| 09/02/1993 | WO1993016829A1 Pump apparatus for pumping melt metal |
| 08/05/1993 | WO1993014969A1 Process and arrangement for draining a liquid residue from the bottom of a tank |
| 06/03/1993 | DE4126384A1 Two phase pump with no moving parts - uses compressed gas to force hot corrosive fluids through dynamic valve |
| 06/02/1993 | CN1072611A Compressing oxygen |
| 05/27/1993 | WO1993010350A1 Preloaded over-center valve actuating mechanism |
| 05/26/1993 | CN2134518Y Barometic pressure suction pump |
| 05/26/1993 | CN2134517Y Efficience negative pressure pumping apparatus |
| 05/19/1993 | EP0542434A1 Compressing oxygen |
| 05/15/1993 | CA2082101A1 Compressing oxygen |
| 04/27/1993 | US5205720 Method and apparatus for producing compressed air and water pumping apparatus utilizing the produced air |
| 04/27/1993 | US5205316 Air/water volume control system |
| 03/31/1993 | EP0534663A2 Method, system and apparatus for transferring fluids |
| 03/27/1993 | CA2077862A1 Method, system and apparatus for transferring fluids |
| 03/04/1993 | DE4228813A1 Vertical pump for well water - has electromagnetically actuated valve responsive to water levels |
| 02/17/1993 | CN2127127Y Small air charging system |
| 02/16/1993 | US5186611 Pump arrangement for pumping liquid by means of compressed air |
| 02/10/1993 | CN2126881Y Oil suction unit |
| 02/02/1993 | US5183391 Valve pump |
| 12/30/1992 | CN2126337U Pneumatic liquid displacing device |
| 11/11/1992 | EP0288468B1 Container discharge apparatus and method |
| 11/10/1992 | US5161956 Valve pump |
| 10/28/1992 | CN1065707A Pressure pump |
| 10/27/1992 | US5158218 For use by athletes |
| 10/20/1992 | US5156814 Flow injection analysis |
| 09/30/1992 | CN2117485U Liquid suction and expulsion pump |
| 09/10/1992 | DE4107099A1 Syphon system - uses contracted and expanded air to maintain water pressure in maintenance-free pump or desalination functions |
| 09/09/1992 | EP0502564A1 Fluid dispensing system |
| 09/09/1992 | CN2115420U Pressure pump |
| 09/02/1992 | CN2114547U Anti-sticking material rator for concrete injector |
| 08/25/1992 | US5141406 High-lift tubular pump |
| 08/25/1992 | US5141405 Leak proof, preloaded, high-biasing force float-operated over-center valve actuating mechanism |
| 08/25/1992 | US5141404 Pump apparatus |
| 08/19/1992 | CN2113371U Hydraulic pump |
| 08/19/1992 | CN2113370U Starch pump |
| 08/04/1992 | CA1305950C Liquid dispensing pump |
| 07/29/1992 | CN2111396U All-purpose gas pressure pump |
| 07/14/1992 | US5129788 Heat-driven pump |
| 06/24/1992 | EP0491009A1 Fluid dose feeder particularly for glueing workpieces. |
| 06/16/1992 | US5121796 Oil well spill trough |
| 06/02/1992 | US5118224 Mortar transport apparatus |
| 05/29/1992 | WO1992008897A1 Fluid pump adaptor |
| 05/27/1992 | EP0486528A1 Method and device for pumping liquid at high temperature through a pipe. |
| 05/27/1992 | DE4037123A1 Lattice type lift pump - introduces air at venturi near bottom of stand-pipe |
| 05/27/1992 | CN2105588U Air-pressure type automobile fuel feeder |
| 05/27/1992 | CN2105587U Multi-function liquid suction and storage device |
| 05/20/1992 | CN2104971U Air pressure water pump |
| 05/20/1992 | CN2104970U Automatic drainage and transport pump |
| 03/18/1992 | EP0475701A1 Heat-driven pump |
| 01/23/1992 | WO1992000814A1 Fluid dose feeder particularly for glueing workpieces |
| 01/22/1992 | CN2093918U Shothole pumping gear |
| 01/08/1992 | EP0465242A1 Method and apparatus for producing compressed air |
| 01/07/1992 | US5078579 Side entry fish pump |
| 01/04/1992 | WO1992001154A1 Method of and device for providing compressed air and water pumping device using air thus compressed |
| 12/24/1991 | US5074758 Slurry pump |
| 12/19/1991 | DE4018770A1 Pump for viscous fibre-carrying suspensions - uses waste compressed air from motor and is of displacement type |
| 12/18/1991 | CN2090894U Automatic device for pressing water by air |
| 12/17/1991 | US5073090 Fluid piston compressor |
| 11/20/1991 | CN1014819B Hydropneumatic water pumping apparatus |
| 11/19/1991 | US5066198 Gas lift valve |
| 11/12/1991 | CA2042302A1 Valve pump |
| 10/31/1991 | WO1991015950A1 Method and apparatus for inducing artificial oceanographic upwelling |
| 10/29/1991 | CA1291369C Water pump |
| 10/09/1991 | CN2086338U Air-pressure pump |
| 09/25/1991 | CN1054817A Liquid raising method by gas and its device |
| 09/18/1991 | CN2084996U Air-compressing continuous water injector |
| 09/10/1991 | US5046925 Gas piston liquid flow controller |
| 09/05/1991 | DE4006558A1 Pump system for food fluids - has two intermediate vessels, each connected by separate vacuum and overpressure lines to control valve and form there to pump |
| 08/27/1991 | US5042518 Liquid elimination system for vacuum line |
| 07/23/1991 | CA1286538C Vertical hydro-hoist and method of operating the same |
| 07/17/1991 | CN2081008U Jet type float air-pressure water pump |
| 07/10/1991 | CN2080586U Pneumatic bore hole pump |
| 06/12/1991 | EP0431460A1 Vacuum pump control apparatus for an evacuating type waste water collecting system |
| 06/11/1991 | US5022427 Annular safety system for gas lift production |
| 05/15/1991 | CN2077055U Airstream depth water lifts |
| 05/08/1991 | CN2076620U Blow-pressure oil suction pipe |
| 04/30/1991 | US5011376 Valve control system for an air displacement type pump |
| 04/18/1991 | WO1991005171A1 Air operated vacuum pump |
| 04/16/1991 | US5007804 Fuel reactor |
| 04/16/1991 | US5007803 Air operated vacuum pump |
| 04/09/1991 | US5006046 Method and apparatus for pumping liquid from a well using wellbore pressurized gas |
| 04/02/1991 | US5004405 Pneumatically powered submersible fluids pump with integrated controls |
| 03/29/1991 | CA2025922A1 Air operated vacuum pump |
| 03/19/1991 | CA1281593C Frail material slurry pump |
| 03/07/1991 | WO1991002901A1 Water pump |
| 02/21/1991 | WO1991002166A1 Procedeure and device for pumping liquid at high temperature through a pipe |
| 02/05/1991 | US4990061 Fluid controlled gas lift pump |
| 01/30/1991 | EP0410923A1 Pump arrangement for pumping liquid by means of compressed air |
| 01/29/1991 | US4987954 Fuel reactor |
| 01/23/1991 | CN1048742A Pedal-pneumatic type oil pump for oil drum |
| 01/15/1991 | CA1279043C Manually actuated pump dispenser |