| 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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| 02/16/1994 | CN2156315Y Top fixing rod type oil pump |
| 02/16/1994 | CN2156314Y Pressure and liquid increaser for deep well pump of oil suction machine |
| 02/08/1994 | US5284422 Method of monitoring and controlling a well pump apparatus |
| 01/26/1994 | CN1081236A Chain-type long stroke pumping unit |
| 01/25/1994 | US5281109 Shallow well pumping apparatus |
| 01/25/1994 | US5281100 Well pump control system |
| 01/19/1994 | CN2153655Y Electrothermal pumping unit |
| 01/12/1994 | CN1080695A Hollow oil pump and extracting process |
| 01/12/1994 | CN1080694A Energy-saving power device for sliding beam oil pump |
| 01/12/1994 | CN1080693A Sliding beam type oil pump numerical controlled power device |
| 01/06/1994 | WO1994000668A1 Method of and pumping system for operating and underground reservoir |
| 01/06/1994 | WO1993018306A3 Hydraulic oil well pump drive system |
| 01/05/1994 | CN2152097Y Two-way multifunction oil pump |
| 01/04/1994 | US5275540 Linear fluid motor system |
| 12/29/1993 | CN2151245Y Centrilizing device of pipe sucking pump |
| 12/29/1993 | CN2151244Y Multifunctional joint |
| 12/29/1993 | CN1080028A Inner drum surface mfg. technique for oil-well pump |
| 12/22/1993 | CN2150363Y Friction casing type optic lever clamping apparatus for oil-sucking machine |
| 12/15/1993 | CN2149473Y Oil sucking out equipment of ball locking channel type |
| 12/08/1993 | CN2148834Y Anti-dropping and anti-wearing jointing hoop for sucker rod |
| 12/08/1993 | CN2148833Y Independent piston type beam-pumping unit |
| 12/01/1993 | CN2148199Y Cam extended-range type long-stroke oil pumping unit |
| 12/01/1993 | CN2148198Y Positive displacement well pump |
| 12/01/1993 | CN1079029A Controller for low speed start, operation spurt of slide beam oil pump |
| 11/29/1993 | CA2069831A1 Neutralizer valve for a downhole pump |
| 11/24/1993 | CN2147374Y High-effect energy-saving rod oil suction machine |
| 11/24/1993 | CN2147373Y Energy convertion compensator for oil suction well |
| 11/16/1993 | US5262065 Purification and decontamination of aquifiers using pumps, pipes and sleeves |
| 11/16/1993 | US5261791 Method and apparatus for recovering pollutants from an aquifer |
| 11/10/1993 | CN2145864Y Booster mechanical valve |
| 11/02/1993 | CA2067896A1 Hydrostatically balanced pump |
| 10/28/1993 | WO1993021442A1 Well pump control system |
| 10/27/1993 | CN2144721Y 轮式长冲程抽油机 Wheeled long stroke pumping unit |
| 10/20/1993 | CN2144199Y Pulling and pressure prevention device for well pump |
| 10/20/1993 | CN2144198Y Stud ring driven beam-pumping unit |
| 10/19/1993 | US5253977 Multistage pump for two-phase effluents |
| 10/19/1993 | US5253713 Valving member |
| 10/19/1993 | US5253541 Oil well pumping mechanism |
| 10/12/1993 | US5252043 Linear motor-pump assembly and method of using same |
| 10/12/1993 | US5251696 Method and apparatus for variable speed control of oil well pumping units |
| 09/29/1993 | CN2142894Y Moveable sealing device |
| 09/21/1993 | US5246350 High efficiency solar powered pumping system |
| 09/16/1993 | WO1993018306A2 Hydraulic oil well pump drive system |
| 09/16/1993 | WO1993018302A1 Methods and apparatus for recovering pollutants |
| 09/16/1993 | CA2131708A1 Methods and apparatus for recovering pollutants |
| 09/15/1993 | CN2142153Y Series oil-well pump with tapered double-plunger |
| 08/25/1993 | CN2140978Y Long-stroke balanced beam unit |
| 08/25/1993 | CN2140977Y Energy-saving power unit for beam-pumping unit |
| 08/25/1993 | CN2140976Y High-efficient combined underground reciprocating pumping unit for high viscosity oil |
| 08/25/1993 | CN1075536A Gas-pressure regenerating type beam unit for thick oil |
| 08/25/1993 | CN1075535A Dual-function rack wobble-wheel type beam unit |
| 08/25/1993 | CN1021925C Combined-acting wheel pull-rod type pumping unit |
| 08/24/1993 | US5238060 Sampling pump with packer |
| 08/18/1993 | CN2140438Y Compression-proof implement for deep-well pump |
| 08/11/1993 | CN2140001Y Cam cylinder automatic control beam-pumping unit |
| 08/11/1993 | CN2140000Y Two-purpose frame blaance wheel type beam-pumping unit |
| 08/11/1993 | CN1075191A Hydraulic cylinder type pumping unit in well and oil extraction method |
| 08/04/1993 | EP0455696B1 Positive-displacement pump |
| 07/21/1993 | CN2138708Y Anti-touching short section of deep well pump |
| 07/08/1993 | WO1993013315A1 Pump-off control by integrating a portion of the area of a dynagraph |
| 07/06/1993 | US5224834 Pump-off control by integrating a portion of the area of a dynagraph |
| 06/30/1993 | CN2137295Y Fully-ballanced double-belt long-stroke oil pump |
| 06/29/1993 | US5222868 Well pump apparatus with inspection conduit |
| 06/29/1993 | US5222553 Water well pump |
| 06/22/1993 | US5220962 Pump apparatus for pumping well fluids from a wellbore having low formation pressure |
| 06/09/1993 | CN2135671Y Mast type numerical controll oil sucker |
| 06/09/1993 | CN2135670Y Sealing assemblage for plunger pump |
| 06/09/1993 | CN1072995A Epicyclic complex motion type beam pumping unit with long stroke |
| 06/02/1993 | CN1072756A Triangle-frame beam oil-pumping machine |
| 06/02/1993 | CN1021073C Low-speed driving system with stepless speed regulation for beam oil-pumping unit |
| 05/26/1993 | CN2134511Y Thermal zinc immersion sucker rod |
| 05/19/1993 | EP0541801A1 Rotary compressor |
| 05/11/1993 | US5209651 Multiple engine deep well pump |
| 05/11/1993 | US5209293 Apparatus for fluidizing formation fines entrained in formation fluids entering a production well penetrating an oil-bearing formation |
| 05/05/1993 | CN1071737A Crank pulley oil sucker |
| 05/04/1993 | US5207726 Hydraulic pump |
| 04/20/1993 | US5204595 Method and apparatus for controlling a walking beam pump |
| 04/13/1993 | CA1316046C Down hole hydraulically actuated pump |
| 04/01/1993 | WO1993006370A1 Pump apparatus |
| 04/01/1993 | WO1993006369A1 Linear electric motor and method of using and constructing same |
| 03/23/1993 | US5196770 Vertically reciprocating constant power drive unit for raising a load step by step |
| 03/10/1993 | CN2127962Y Friction welding oil suction rod |
| 02/24/1993 | CN2127435Y Tow-way shutter beam-pumping unit |
| 02/23/1993 | US5188517 Pumping system |
| 02/16/1993 | US5186254 Borehole pumping installation |
| 02/09/1993 | US5184507 Surface hydraulic pump/well performance analysis method |
| 02/04/1993 | WO1993002289A1 Pump control using calculated downhole dynagraph information |
| 02/04/1993 | WO1993002210A1 Apparatus and methods for preserving, transporting, storing, re-hydrating and delivering viable microorganisms |
| 02/03/1993 | CN2126723Y Exhaust oil pump |
| 02/02/1993 | US5183391 Valve pump |
| 01/27/1993 | CN2126640Y Chain type beam-pumping unit |
| 01/19/1993 | US5180289 Air balance control for a pumping unit |
| 01/06/1993 | CN1067713A Pump control system for downhole motor-pump assembly and method of using same |
| 12/30/1992 | CN2126328U Liftwheel type hydraulic pumping unit |
| 12/30/1992 | CN2126327U Long stroke self-balance pumping unit |
| 12/30/1992 | CN1067483A Oil pumping unit with double acting wheel and pull rod |
| 12/23/1992 | CN2125734U Hollow oil suction pump |
| 12/23/1992 | CN2125733U Numerical controlling power device of beam oil pump |
| 12/10/1992 | WO1992021880A1 Pump control system for a downhole motor-pump assembly and method of using same |
| 12/02/1992 | CN2123625U Double wheel pull rod beam-pumping unit |