| 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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| 01/29/2003 | CN2533263Y Six-link variable pivot point beam pumping unit for straight hole and slant hole |
| 01/29/2003 | CN2533262Y Multifunctional friction pumping unit |
| 01/29/2003 | CN2533261Y Long-stroke low frequency energy-saving pumping unit |
| 01/21/2003 | US6508310 Bladder-type sampling pump controller |
| 01/15/2003 | CN2531135Y Efficiency-promoting valve of oil-well pump |
| 01/15/2003 | CN2531134Y Reciprocating elastic nano sand control pump |
| 01/15/2003 | CN2531133Y Feedback high viscosity oil pump plunger pump barrel |
| 01/15/2003 | CN2531132Y Energy-saving balancing device for beam-pumping unit |
| 01/15/2003 | CN2531131Y Drainable sand control oil-well pump |
| 01/15/2003 | CN1391028A Pumping unit with three-segment moving beam |
| 01/15/2003 | CN1098965C Full-automatic oil producing unit |
| 01/08/2003 | CN2530062Y Directly driving pumping unit |
| 01/08/2003 | CN2530061Y Seat sealable thick oil pump |
| 01/08/2003 | CN2530060Y Magnetic nano-glass sealing and energy saving sand control pump |
| 01/08/2003 | CN2530032Y Oil well pumping unit |
| 01/01/2003 | CN2528962Y Piston-type oil-water energy converter |
| 01/01/2003 | CN2528961Y Underground hydraulic oil-well pump |
| 01/01/2003 | CN2528932Y Linkage variable-pitch beam-pumping unit |
| 12/31/2002 | CA2201497C System for pumping well fluids |
| 12/26/2002 | US20020195988 Sine wave variable speed drive |
| 12/25/2002 | CN2527741Y Sandpump |
| 12/25/2002 | CN2527740Y Antisand antislag back flushing device for oil well pump |
| 12/24/2002 | US6497561 Downstroke sucker rod pump and method of use |
| 12/24/2002 | US6497281 Cable actuated downhole smart pump |
| 12/19/2002 | WO2002101241A1 Double-acting reciprocating downhole pump |
| 12/19/2002 | US20020189805 Double-acting reciprocating downhole pump |
| 12/18/2002 | CN2526537Y Spring friction pump |
| 12/18/2002 | CN2526536Y Anti-seizing device for oil pump |
| 12/18/2002 | CN2526535Y Piston-gas pump for oil well |
| 12/17/2002 | US6495929 Turbogenerator power control system |
| 12/11/2002 | CN2525277Y Gas automatic compensation anti-sand scale clamp oil pump |
| 12/11/2002 | CN2525276Y Protector of oil pump |
| 12/11/2002 | CN2525275Y Pendulum wheel type distance increasing oil pumping unit |
| 12/11/2002 | CN2525250Y Nano vertical ground oil pumping unit |
| 12/11/2002 | CN2525248Y Distance regulating composite mule-head economic oil pumping unit |
| 12/11/2002 | CN1384271A Vertical-pipe pumping unit |
| 12/11/2002 | CN1384270A Beam-balancing pumping unit without inertia force |
| 12/05/2002 | US20020182089 Fluid well pumping system |
| 12/04/2002 | CN2523950Y Hydraulic energy-saving oil sucker |
| 12/04/2002 | CN2523949Y Six bar linkage and support point variable walking beam oil sucker |
| 12/04/2002 | CN2523948Y Oil sucker driven by linear motor |
| 12/04/2002 | CN2523947Y Energy-saving oil sucker |
| 11/27/2002 | CN2522645Y Air-trapping oil-well pump |
| 11/21/2002 | US20020172600 Bladder pump for liquid sampling and collecting |
| 11/20/2002 | CN2521423Y Double stroke oil-well pump |
| 11/19/2002 | US6481987 Travelling valve for a pumping apparatus |
| 11/19/2002 | US6481082 Portable continuous sucker rod manufacturing process |
| 11/07/2002 | WO2002089307A1 Well pump motor driver control apparatus and method |
| 10/31/2002 | WO2002086322A2 Fluid controlled pumping system and method |
| 10/31/2002 | CA2441307A1 Fluid controlled pumping system and method |
| 10/30/2002 | CN2519036Y Soft friction cylindrical oil-well pump |
| 10/30/2002 | CN2519019Y Hydraulic integrated machine for thermal recovery of heavy oil |
| 10/23/2002 | CN2517892Y Air-liquid mixed pump deep well pump |
| 10/22/2002 | US6467541 Plunger lift method and apparatus |
| 10/17/2002 | WO2002081860A1 Pump control method and apparatus |
| 10/15/2002 | US6464012 Oil lift system |
| 10/10/2002 | US20020144821 Apparatus and system control fot the removal of fluids and gas from a well |
| 10/10/2002 | US20020144816 Apparatus and system control for the removal of fluids and gas from a well |
| 10/09/2002 | CN2515423Y Beam-pumping unit |
| 10/08/2002 | US6460622 Apparatus and system control for the removal of fluids and gas from a well |
| 10/02/2002 | CN2514114Y Top Sheave type long stroke pumping unit |
| 10/02/2002 | CN1372066A Straight line movement oil pumping machine |
| 09/26/2002 | WO2002075105A1 A pumping unit driven by a linear electric motor |
| 09/25/2002 | CN1370927A Hydraulic feedback sand-preventing pump for flexible continuous pumping rod |
| 09/25/2002 | CN1370909A Steel cable lifting belt driving wheel for oil production machine |
| 09/19/2002 | US20020131867 Travelling valve for a pumping apparatus |
| 09/18/2002 | CN2511810Y Efficient boosting valve for oil pump |
| 09/18/2002 | CN2511789Y Tower digital sucker |
| 09/18/2002 | CN1369640A Driver for steel cable lifting band of pumping unit |
| 09/17/2002 | US6450050 Walking beam balanced span and moment regulating economized oil pump and a stroke regulating device of the same |
| 09/06/2002 | WO2002068788A2 Well pumping unit driven by linear motor |
| 08/28/2002 | CN2508021Y Secondary suction load-reducing oil pump |
| 08/28/2002 | CN2507994Y Drum type pumping unit |
| 08/22/2002 | WO2002064941A1 Bailer for simultaneously recovery of liquid and gas from a well |
| 08/21/2002 | CN2506791Y Oil and water preseparation taking/intaking double fluid pump |
| 08/21/2002 | CN2506768Y Moving balance walking beam sucking machine |
| 08/20/2002 | US6435838 Fluid well pump |
| 08/14/2002 | CN2505617Y Stroke length increasing device of oil-well pump |
| 08/14/2002 | CN2505592Y Secondary balancing mechanism for beam pumper |
| 08/14/2002 | CN2505591Y Double tail bearing beam pumper |
| 08/14/2002 | CN2505590Y Beam-balanced and stroke length increasing pumping unit |
| 08/14/2002 | CN1089139C Long stroke oil sucker |
| 08/07/2002 | CN2504403Y Sealed rod oil-well pump |
| 08/07/2002 | CN2504385Y Interference balancing beam pumping unit |
| 08/07/2002 | CN1362582A Valve capable of raising the efficiency of oil pump |
| 08/07/2002 | CN1362572A Long-stroke pumping machine operating in differential reversing mode |
| 07/31/2002 | CN2503229Y Permanent magnetic oil-submersible pump |
| 07/31/2002 | CN2503228Y Rotary anti-biasing-wear device for oil-well pump |
| 07/31/2002 | CN2503202Y Wide-band beam-pumping unit |
| 07/31/2002 | CN2503200Y Symmetrical balance changing-over beam-pumping unit |
| 07/31/2002 | CN2503199Y Balance circulation timing and long-range controlled beam-pumping unit |
| 07/25/2002 | WO2002057551A1 Method for hydraulic subsea dredging |
| 07/24/2002 | CN2502039Y Valve type well pump for raising thickened oil |
| 07/24/2002 | CN2502007Y Oil punping unit with four wheels |
| 07/24/2002 | CN2502006Y Floor type multi-cable pumping unit |
| 07/24/2002 | CN2502005Y Chain oil pumping unit |
| 07/24/2002 | CN1088157C Incline shaft petroleum oil well pump |
| 07/23/2002 | CA2331932A1 The mechanical load equalizer |
| 07/23/2002 | CA2331931A1 The hydraulic pumping unit |
| 07/15/2002 | CA2331511A1 The gaslift reciprocating pump |