| Patents for F04B 47 - Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps (5,485) |
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| 01/24/1991 | DE4019594A1 Pump for oil industry has chamber with flexible bags - and can pump mixt. contg. gases, liq. hydrocarbon(s) and solid particles without problems affecting rotary pumps |
| 01/22/1991 | US4986727 Pressure-operated oil and gas well swabbing device |
| 01/15/1991 | US4984969 Lifting fluid from wells |
| 01/09/1991 | CN2069038U Well pump having mechanical control fixed valve |
| 01/08/1991 | US4983105 Down hole pump |
| 01/02/1991 | CN2068607U Double pendulum long stroke beam-pumping unit |
| 12/19/1990 | CN2067772U Combined head sheave type long stroke oil pumping unit |
| 12/15/1990 | CA2013862A1 Well unit dynamometer installation means and method |
| 12/05/1990 | CN2066908U Polish rod sealing device for pumping machine without filling material |
| 12/04/1990 | US4974674 Extraction system with a pump having an elastic rebound inner tube |
| 11/28/1990 | EP0398977A1 Apparatus for removing fluid from the ground and method for same |
| 11/28/1990 | CN2066514U Valve cover for oil pump |
| 11/15/1990 | WO1990013744A1 Method and apparatus for pumping a fluid from a well |
| 11/14/1990 | CN2065683U Pump with balanced weight |
| 11/13/1990 | US4969518 Reciprocating rod type downhole pump |
| 11/13/1990 | CA1276102C Subsurface stuffing box assembly |
| 11/07/1990 | CN2065255U Pressure-compensated double-action oil pump |
| 11/07/1990 | CN2065254U Mechanically-driven centrifugal oil pump |
| 11/06/1990 | US4968934 Magnetic marking apparatus for magnetically measuring displacement of a moveable element in a well |
| 11/06/1990 | US4968226 For lifting fluid through a conduit |
| 10/24/1990 | CN2064429U Sand-proof pump with long pistion and soft bush |
| 09/21/1990 | CA2011180A1 Extraction system with a pump having an elastic rebound inner tube |
| 09/12/1990 | CN2061982U Suspended pump |
| 09/05/1990 | CN1045161A Treadle submersible pump |
| 08/29/1990 | CN2061218U Long-stroke hydraulic type oil pumping machine |
| 08/22/1990 | CN2060826U Sucker rod made of glass fibre reinforced plastic |
| 08/22/1990 | CN2060825U Beam-pumping unit being able to adjust stroke steplessly |
| 08/15/1990 | CN2060483U Multiplication oil-well pump |
| 08/14/1990 | US4947936 Well unit dynamometer installation means and method |
| 08/09/1990 | WO1990008898A1 Positive-displacement pump |
| 08/01/1990 | CN1009023B Oil drawer with self changing torque |
| 07/18/1990 | CN1043979A Hydrodynamic oil-diving pump |
| 06/28/1990 | WO1990007215A1 Motor-driven unit with constant output and alternating vertical movement for step by step lifting a load |
| 06/26/1990 | US4936383 Downhole pump pulsation dampener |
| 06/13/1990 | CN1042971A Gearing unit for wellpump with long-stroke plunger |
| 06/06/1990 | CN2057967U Energy-saving device of beam-pumping unit |
| 05/30/1990 | CN2057708U Single screw stem pump butt-joint device |
| 05/23/1990 | CN2057472U Six-connecting-rod length stroke oil pumping unit |
| 05/16/1990 | CN2057231U Hydraulic long stroke pumping unit |
| 05/16/1990 | CN1007997B Long stroke beam-pumping unit with chain without sliding beam |
| 05/15/1990 | US4925374 Down hole hydraulically actuated pump |
| 05/08/1990 | US4923372 Gas lift type casing pump |
| 05/01/1990 | US4921407 Production pump for high gravity or sand laden oil |
| 04/26/1990 | DE3835919A1 Pipe-water lifting through base-rotation suction |
| 04/17/1990 | US4916959 Long stroke well pumping unit with carriage |
| 04/17/1990 | CA1267835A1 Oil well downhole liquid injection assembly |
| 04/11/1990 | CN1007542B Adjustable out-of-phase crank balanced oil extractor and related method |
| 03/14/1990 | CN2054496U Driven well pump piston combined steel core |
| 03/13/1990 | US4907953 Locking gas equalizer assembly |
| 03/07/1990 | CN2054091U Hydraulic lift-increasing oil pump |
| 02/21/1990 | CN1039868A Two-stage balance bar beam-punping unit |
| 02/13/1990 | USRE33163 Gas equalizer for downhole pump |
| 02/06/1990 | US4898519 Deep well solar pump |
| 01/31/1990 | CN2052066U Hydraulic feedback condensed oil pump |
| 12/26/1989 | US4889473 Production plunger |
| 12/14/1989 | WO1989011038A3 Piston pump for multiphase fluids and applications thereof |
| 12/13/1989 | CN2049283U Displacement-varying thick oil pump |
| 12/13/1989 | CN2049282U Reciprocating liquid-discharging sucker rod pump capable of draining oil |
| 12/12/1989 | US4886432 Bladder pump assembly |
| 12/12/1989 | US4886428 Pump arrangement, particularly for pumping water from deep wells |
| 12/06/1989 | EP0344821A2 A pump arrangement, particularly for pumping water from deep wells |
| 12/06/1989 | CN2048906U Tubular oil-well pump |
| 12/06/1989 | CN2048905U Disengaging contactor for oil sucker rod |
| 11/16/1989 | WO1989011038A2 Piston pump for multiphase fluids and applications thereof |
| 11/14/1989 | US4880366 Plastic hand lift pressure pump |
| 11/14/1989 | US4880363 Well pump system |
| 11/14/1989 | US4880062 Oil well downhole liquid injection assembly |
| 11/08/1989 | CN2047314U 双塞深井手动抽水泵 Double stuffed deep hand pumps |
| 11/08/1989 | CN1005741B Drum-type long stroke oil sucking machine |
| 10/24/1989 | CA1262483A1 Method and device for pumping a highly viscous liquid |
| 10/03/1989 | US4871302 Apparatus for removing fluid from the ground and method for same |
| 09/26/1989 | CA1261677A1 Pump |
| 09/26/1989 | CA1260317A1 Well pump |
| 09/19/1989 | US4867645 Double diaphragm pressure switch for a well water system |
| 09/19/1989 | US4867242 Method and apparatus for breaking gas lock in oil well pumps |
| 09/12/1989 | CA1259224A1 Gas-lock breaking device |
| 08/29/1989 | US4861239 High efficiency pump method and apparatus with hydraulic actuation |
| 08/23/1989 | CN2043283U Wide-band type long-stroke oil extractor |
| 08/22/1989 | US4859151 Pump-off control for a pumpjack unit |
| 08/10/1989 | WO1989007201A1 Apparatus for removing fluid from the ground and method for same |
| 08/02/1989 | CN2042120U Parallel deep-well reciprocating pump with air pressure and water pressure transmitting hose |
| 07/18/1989 | US4848454 Downhole tool for use with a ball and seat traveling valve for a fluid pump |
| 07/18/1989 | US4848085 Oil-well pumping system or the like |
| 07/05/1989 | CN2040554U Oil-pumping pump |
| 07/05/1989 | CN1033672A Beam-pumping unit with large amplitude for two oil wells |
| 06/21/1989 | EP0320859A1 Borehole pump for small diameter boreholes |
| 06/20/1989 | US4840546 Pump for liquids and gases |
| 06/13/1989 | EP0217796A4 A pump. |
| 06/07/1989 | CN1033307A Manually-operable pump, particularly for wells |
| 06/06/1989 | CA1255154A1 Pumping unit drive system |
| 05/30/1989 | US4834620 Low horsepower apparatus and technique for raising liquid above the static surface level thereof |
| 05/24/1989 | CN1004294B Long stroke pumping unit |
| 05/17/1989 | CN2037774U Integral piston of plungeroil pump |
| 05/10/1989 | CN2037401U Changing radial decompression drastic extraction pump |
| 04/18/1989 | US4822257 Pump arrangement, particularly for pumping water from deep wells |
| 04/13/1989 | DE3730671A1 Vorrichtung zur unterseeischen foerderung von erdoel und erdgas Apparatus for subsea production of oil and natural gas |
| 04/11/1989 | US4820137 Well pump |
| 04/11/1989 | CA1252335A1 Counterbalanced pumps |
| 03/29/1989 | CN1032069A Undersea conveying apparatus of crude oil and natural gas |
| 03/28/1989 | US4815949 In-well submersible motor with stacked component stator |