| 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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| 12/12/2001 | CN1326043A Ground-type multi-cable pumping unit |
| 12/11/2001 | CA2237835C Polished rod clamp |
| 12/09/2001 | CA2710783A1 Pump drive head with stuffing box |
| 12/05/2001 | CN2463562Y Rotary suspended disk of beam-pumping unit |
| 12/05/2001 | CN2463561Y Full balance chain pulley driving vertical beam-pumping unit |
| 12/04/2001 | US6325142 Turbogenerator power control system |
| 11/28/2001 | CN2462107Y Crankshaft pin anti-droping device of beam-pumping unit |
| 11/22/2001 | WO2001089068A2 Method for boosting the output voltage of a variable frequency drive |
| 11/21/2001 | CN2460747Y Device for promoting efficiency of oil-well pump |
| 11/14/2001 | CN2459464Y Torque converted oil pumping machine |
| 11/14/2001 | CN2459463Y Forced liquid increasing device for oil pump |
| 11/13/2001 | US6315523 Electrically isolated pump-off controller |
| 11/07/2001 | CN2458437Y Soft sealed sand preventing pipe type oil-well pump |
| 11/07/2001 | CN1320761A Self-adaptive method for working system for oil production apparatus |
| 11/07/2001 | CN1320760A Method for increasing running efficiency of oil production apparatus |
| 11/07/2001 | CN1320759A Automatic digital well-logging method |
| 11/07/2001 | CN1320758A Method for measuring unloading, loading and running states of underground deep-well pump |
| 11/06/2001 | US6312637 Method of making a rod guide with both high erodible wear volume and by-pass area |
| 11/01/2001 | WO2001081764A1 Method for lift pumping and lift pump |
| 10/31/2001 | CN2457369Y Movable tube type thickened oil pump |
| 10/25/2001 | US20010032721 Method for boosting the output voltage of a variable frequency drive |
| 10/24/2001 | CN2455946Y Pump for oil well |
| 10/24/2001 | CN1319164A Imporved vibratory pump |
| 10/23/2001 | US6305918 Piston rod seal assembly for walking beam compressor |
| 10/10/2001 | CN2453154Y Program-controlled oil-pumping installation |
| 10/09/2001 | US6300699 Motor compensating spring |
| 10/03/2001 | CN2451759Y Apparatus for preventing dropper & sands from entering into fixed valve for pipe type oil-well pump |
| 10/03/2001 | CN2451758Y Plunger hanging load type oil-well pump |
| 10/03/2001 | CN2451757Y Sandproof oil-well pump |
| 10/03/2001 | CN2451756Y Double-purpose oil-well pump |
| 09/26/2001 | CN2450409Y High-efficiency plunger |
| 09/26/2001 | CN2450408Y Gas-proof oil well pump |
| 09/26/2001 | CN2450407Y High-efficiency pumping unit |
| 09/26/2001 | CN2450406Y Sanding-in preventing oil well pump |
| 09/19/2001 | CN2448949Y Swing straight line type large stroke oil pump |
| 09/19/2001 | CN2448948Y Active and static distance adjustable walking-beam oil pump |
| 09/19/2001 | CN1313451A Chain-rope pumping unit |
| 09/18/2001 | US6290475 Helical wiper for sucker rod pump |
| 09/13/2001 | US20010021347 Pumpjack dynamometer and method |
| 09/07/2001 | CA2300267A1 Oil lift system |
| 09/05/2001 | EP0986161A4 Motor for submerged pump |
| 09/05/2001 | CN2446305Y Reversing balancer of pumping unit |
| 09/05/2001 | CN2446304Y Hydraulic dual-action oil extracting unit |
| 08/29/2001 | CN2445114Y Tubular pile oil-well pump when positive pouring fluid |
| 08/15/2001 | CN2443169Y Tail boom sliding balancer for beam pumping unit |
| 08/15/2001 | CN2443168Y Kinetic energy balancer for long stroke pumping unit |
| 08/14/2001 | US6273690 Downhole pump with bypass around plunger |
| 08/09/2001 | WO2001057399A1 Sucker rod well pump with reciprocating barrel |
| 08/09/2001 | CA2399073A1 Sucker rod well pump with reciprocating barrel |
| 08/08/2001 | CN2441998Y Counter weight device of oil pump unit |
| 08/08/2001 | CN2441997Y Regulator of beam type pump stroke |
| 08/02/2001 | WO2001055552A1 An oil pumping unit with a counterweight whose centroid can be adjusted |
| 08/01/2001 | CN2440960Y Drilling pump with ram push-rod power end |
| 07/31/2001 | CA2200665C Reservoir fluids production apparatus and method |
| 07/24/2001 | US6265786 Turbogenerator power control system |
| 07/11/2001 | CN2438847Y Pump valve reverse opening apparatus for tubular pump |
| 07/11/2001 | CN1302953A Pumping unit with lower centroidal and balanced running beam |
| 07/04/2001 | CN2437875Y Enclosed positive displacement oil well pump |
| 07/03/2001 | US6253844 Swivelling device for a downhole rod pump, and method of use thereof |
| 07/03/2001 | US6253631 Pumping unit lock down apparatus |
| 06/27/2001 | CN2436685Y Pulsation gas lift oil production pump |
| 06/27/2001 | CN2436684Y Oil pump for deviated hole |
| 06/27/2001 | CN2436683Y Hydraulic rod pump petroleum production means |
| 06/26/2001 | US6250392 Pump systems and methods |
| 06/21/2001 | CA2328790A1 Shroud for use with electric submergible pumping system |
| 06/20/2001 | EP1108142A1 Vibratory pump improvement |
| 06/13/2001 | CN2434448Y Rotary plunger oil-well pump |
| 06/13/2001 | CN2434447Y Hollow rod sand sucking and oil extracting appts |
| 06/12/2001 | US6244836 Well pump actuated by natural gas |
| 06/05/2001 | US6242829 Submersible pumping system utilizing a motor protector having a metal bellows |
| 06/05/2001 | US6241016 Drive head assembly |
| 06/05/2001 | CA2108531C Downhole pump of constant differential hydraulic pressure |
| 06/02/2001 | CA2291394A1 Method and apparatus for reducing abrasive contact of a sucker rod string against well tubing |
| 05/22/2001 | US6234770 Reservoir fluids production apparatus and method |
| 05/17/2001 | WO2001034978A1 An oil pumping unit without a walking beam |
| 05/16/2001 | CN2430557Y Long stroke rotary wheel oil pump machine |
| 05/16/2001 | CN2430556Y High efficiency sand-proof oil pump |
| 05/16/2001 | CN2430555Y Double head beam direction variable oil pump machine |
| 05/15/2001 | US6230823 Downhole motor |
| 05/09/2001 | CN2429653Y Large diameter sand-proof pump for sucking thick oil |
| 05/09/2001 | CN1294263A Hydraulic petroleum recovering machine |
| 05/02/2001 | CN2428598Y Lever-scale type oil pump |
| 05/02/2001 | CN1065322C Automatic water pumping machine using multiple sorts of micro-energy |
| 04/27/2001 | CA2291989A1 Well pressure system |
| 04/25/2001 | CN2427649Y Double chennel and double function type deep well pump |
| 04/25/2001 | CN2427648Y Novel and beam type direct balancing oil suction machine |
| 04/25/2001 | CN2427647Y High corrosion proof and high abration-proof type sand-proof oil suction pump |
| 04/19/2001 | US20010000319 Piston rod seal assembly for walking beam compressor |
| 04/19/2001 | US20010000318 Piston for walking beam compressor |
| 04/17/2001 | US6218754 Electric motor of a submersible pump |
| 04/11/2001 | CN2426528Y Slip sleeve bottom valve type viscous crude pump |
| 04/10/2001 | US6213722 Sucker rod actuating device |
| 04/03/2001 | US6209637 Plunger lift with multipart piston and method of using the same |
| 03/28/2001 | CN2425212Y Intelligent beam-pumping unit |
| 03/28/2001 | CN1289010A Tail beam balancer for beam pumping unit |
| 03/20/2001 | US6203289 Hydraulic alternating volumetric pumping system |
| 03/14/2001 | CN2423427Y Self-balance beam-pumping unit |
| 03/14/2001 | CN1287593A Submersible pump assembly for use in a well |
| 03/14/2001 | CN1287590A Drive head for a rotary-driven rod assembly, especially for driving a sand pump |
| 03/13/2001 | US6200103 Gas lift plunger having grooves with increased lift |