| Patents for F04F 7 - Pumps displacing fluids by using inertia thereof, e.g. by generating vibrations therein (455) |
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| 12/12/1990 | CN2067336U Wheel valve type hydraulic ram |
| 10/31/1990 | CN2064833U Flexible valve type water hammer pump with voltage-boosting generating device |
| 10/16/1990 | CA1275261C Process and device for filtering out particles suspended in a liquid |
| 10/04/1990 | WO1990012211A1 Hydraulic ram |
| 10/04/1990 | CA2030549A1 Hydraulic ram |
| 08/14/1990 | US4948341 Water pumping system including a suction ram |
| 07/11/1990 | CN2059194U Driving device with the functions of water delivering and electricity generation |
| 07/11/1990 | CN2059193U Automatic water pump |
| 06/05/1990 | US4930993 Energy regenerative apparatus for a water hammer type pump |
| 03/27/1990 | US4911613 Hydraulic ram-type water pump |
| 01/17/1990 | CN2051304U Automatic pressure lift pumping machine |
| 12/20/1989 | CN2049705U Floating type hydraulic ram |
| 10/19/1989 | WO1989009882A1 Hydraulic ram pump |
| 09/27/1989 | EP0334655A1 Anti-leak seal for motor pump |
| 04/04/1989 | US4817712 Rod string sonic stimulator and method for facilitating the flow from petroleum wells |
| 07/13/1988 | EP0274374A2 Hydraulic pumping device |
| 06/08/1988 | CN87107787A Water-hammer device |
| 04/07/1988 | WO1988002445A1 Hydraulic ram |
| 11/24/1987 | US4708801 Reverse flow to unplug |
| 09/22/1987 | US4695231 Sonic impeller for sonic well pump |
| 08/19/1987 | CN86205705U Hydraulic ram with combined streamlined impact valve |
| 10/22/1986 | EP0198421A1 Process and apparatus for filtering a suspension of particles in a liquid |
| 09/10/1985 | US4540344 Energy transfer device |
| 08/27/1985 | US4537563 Ram pumps |
| 04/16/1985 | CA1185484A1 Constant delivery inertia pump |
| 01/08/1985 | US4492528 Pressure balanced liquid elevating mechanism |
| 12/11/1984 | US4487554 Sonic pump for pumping wells and the like employing a rod vibration system |
| 07/17/1984 | US4460320 Sonic pressure wave surface operated pump with extensible pumping assembly |
| 05/22/1984 | US4449892 Pump with rotary sonic pressure wave generator |
| 12/21/1983 | EP0096145A1 Liquid pump |
| 11/09/1983 | EP0093691A1 Piston pump for liquids |
| 11/01/1983 | US4412786 Positive displacement pump |
| 09/14/1983 | EP0088417A1 Liquid pump using negative pressure |
| 08/16/1983 | US4398870 Variable volume sonic pressure wave surface operated pump |
| 06/28/1983 | US4390326 Downhole pump having a power piston and a production piston |
| 04/26/1983 | US4381177 Sonic pressure wave surface operated pump |
| 01/25/1983 | US4370101 Constant delivery inertia pump |
| 11/23/1982 | US4360087 Suspension and vibration isolation system for a linear reciprocating machine |
| 11/09/1982 | US4358248 Sonic pump for pumping wells and the like employing dual transmission lines |
| 10/26/1982 | US4355789 Gas pump for stirring molten metal |
| 08/17/1982 | CA1129925A1 A.c. operated oscillating armature aquarium pump |
| 08/03/1982 | US4342364 Apparatus and method for coupling sonic energy to the bore hole wall of an oil well to facilitate oil production |
| 07/27/1982 | US4341505 Sonic pressure wave pump for low production wells |
| 06/16/1982 | EP0053920A1 Pumping of liquids |
| 04/14/1982 | EP0049316A1 Liquid pump using negative pressure |
| 03/24/1982 | EP0048224A1 Liquid pump |
| 10/06/1981 | US4293285 Pump |
| 09/29/1981 | CA1109733A1 Energy transfer device |
| 11/04/1980 | US4231711 Extract of energy from the sea |
| 04/24/1979 | CA1053077A1 Pumps |
| 10/24/1978 | US4121895 Kinetic energy type pumping system |
| 09/19/1978 | US4115041 Pumps |
| 09/05/1978 | US4110986 Systems for making use of the energy carried by a fluid and supplied thereto by solar energy |
| 02/14/1978 | US4073604 Construction for a water hammer type pump |
| 10/18/1977 | US4054399 Hydraulic ram valve unit |