| 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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| 07/12/2002 | CA2330698A1 The chain-piston pumping installation |
| 07/10/2002 | CN2499640Y Anti-bias friction and anti-spray polished rod seal device |
| 07/10/2002 | CN2499571Y Drum type oil pumping machine |
| 07/09/2002 | CA2260518C Hydraulic submersible pump for oil well production |
| 07/04/2002 | WO2002031311A3 Gas operated pump for use in a wellbore |
| 07/03/2002 | CN2498328Y Multifunctional locking block for balancing block of sucker |
| 07/03/2002 | CN2498327Y Sucker with linked balance beam |
| 07/03/2002 | CN1087059C Pumping unit and oil-pumping method |
| 07/02/2002 | US6414455 System and method for variable drive pump control |
| 06/26/2002 | CN2497082Y Anti-pull-press oil-well pump |
| 06/26/2002 | CN1355383A Pumping unit with regulatable horizontal or vertical position of sucker rod relative to well |
| 06/26/2002 | CN1355382A Pumping unit with telescopic arm mechanism |
| 06/25/2002 | US6409476 Pumpjack dynamometer and method |
| 06/20/2002 | US20020076343 Travelling valve assembly for a fluid pump |
| 06/19/2002 | CN2495830Y Hydraulic type pump for applying fuel oil |
| 06/13/2002 | WO2002046613A1 Improved rodless pumping system |
| 06/06/2002 | US20020066572 Pump systems and methods |
| 06/05/2002 | CN2494434Y Tubing pump beneficiatino self-vibration plunger valve |
| 05/29/2002 | CN2493742Y Offset balance elastic suspension device for walking beam oil pumping machine |
| 05/29/2002 | CN1085772C Parameters design method for mechanically oil producing technology with rod pump |
| 05/22/2002 | CN2492690Y Symmetrical balanced preliminary oil pumping unit |
| 05/15/2002 | CN2491623Y Lever pump having weighting tube |
| 05/15/2002 | CN2491622Y Double acting pump for well oil water separation and refilling |
| 05/15/2002 | CN2491601Y Chain belt pumping unit |
| 05/14/2002 | US6386322 Method and apparatus for oil well pumping |
| 05/14/2002 | CA2232890C Pump to surface pump |
| 05/08/2002 | CN2490331Y Anti-sand integral pump cylinder tube-type oil-well pump |
| 05/08/2002 | CN2490316Y Inertialess beam-balanced pump |
| 05/08/2002 | CN2490315Y Preoffset long-stroke beam pumping unit |
| 05/07/2002 | US6382933 Bladder pump for liquid sampling and collecting |
| 05/01/2002 | CN2489114Y Oil pipe pumping type well pump |
| 05/01/2002 | CN1083942C Curved beam pumping unit |
| 04/24/2002 | CN2487888Y Separate loading oil-well pump |
| 04/24/2002 | CN1346018A Self-starting type oil pumping machine |
| 04/18/2002 | WO2002031311A2 Gas operated pump for use in a wellbore |
| 04/16/2002 | US6371008 Water-raising pump |
| 04/11/2002 | US20020040785 Gas operated pump for use in a wellbore |
| 04/10/2002 | CN2485450Y Valve pump for production by injection |
| 04/10/2002 | CN2485449Y Pump with long plunger for production by injection |
| 04/10/2002 | CN2485419Y Oil sucker with adjstable weight center for balance |
| 04/09/2002 | US6368084 Downstroke sucker rod well pump |
| 04/02/2002 | US6364633 Internally ported hydraulically actuated down-hole pump |
| 03/28/2002 | US20020035919 Pad plunger assembly with interfitting keys and key ways on mandrel and pads |
| 03/27/2002 | CN2483529Y Piston ring and rod type oil pump |
| 03/27/2002 | CN2483528Y Piston ring and pipe type oil pump |
| 03/20/2002 | CN2482595Y Large-passageway efficient oil-well pump |
| 03/20/2002 | CN1341197A Positive-displacement pump |
| 03/20/2002 | CN1081295C Program-controlled reciprocating beam-pumping unit |
| 03/20/2002 | CN1081287C Method for producing oil from thick oil well and its device |
| 03/19/2002 | US6357552 Submersible pump assembly for downhole use |
| 03/14/2002 | WO2001089068A3 Method for boosting the output voltage of a variable frequency drive |
| 03/14/2002 | US20020031438 Downstroke sucker rod well pump |
| 03/14/2002 | US20020030364 Turbogenerator power control system |
| 03/13/2002 | CN2481876Y Beam compressor |
| 03/13/2002 | CN1080834C Dual-speed energy saving beam-pumping unit with shaped wheel |
| 03/06/2002 | CN2480583Y Large quantity oil pump |
| 03/06/2002 | CN2480544Y Six-lever swing type walking beam oil pump |
| 03/06/2002 | CN1080366C Pump-off controller |
| 03/06/2002 | CN1080364C Improvement in deep well pump apparatus |
| 03/05/2002 | US6352117 Oil lift system |
| 03/05/2002 | US6352107 Wear resistant well pump rod and method for making same |
| 03/05/2002 | CA2245523C Standing valve assembly and downhole pump utilizing said valve assembly |
| 02/27/2002 | CN2479252Y Eccentric valve type steam oil-well pump |
| 02/27/2002 | CN2479251Y Plunger self-rotating oil-well pump |
| 02/27/2002 | CN2479250Y Sand control oil well pump with grooved pump barrel |
| 02/27/2002 | CN2479249Y Forced recovery deep oil well pump |
| 02/27/2002 | CN2479248Y Automatic speed-regulating driving wheel |
| 02/27/2002 | CN2479247Y Self-anchored rod pump |
| 02/26/2002 | US6349765 Water pressure system |
| 02/26/2002 | CA2224054C Water pumping apparatus utilizing compressed air |
| 02/20/2002 | CN2477859Y High efficiency, low loss and intelligence pumping unit |
| 02/20/2002 | CN2477824Y Compound beam energy saving pumping unit |
| 02/20/2002 | CN2477823Y Oil producing appts. having two-tube pillar and vane pump |
| 02/20/2002 | CN1079485C Pumping oil unit |
| 02/13/2002 | CN2476655Y Side-valve suction driving oil-well pump |
| 02/13/2002 | CN1079138C Electromagnetic pumping unit |
| 02/06/2002 | CN2475849Y Automatic pump-impacting device for underground oil-well pump |
| 02/06/2002 | CN2475848Y Rope hanging device for automatic batch rotary sucket rod |
| 02/06/2002 | CN2475828Y Arc-shape reduced-diameter rotary wheel type beam pump unit with pendulum rod varied-distance balancing |
| 02/05/2002 | US6343656 System and method for optimizing production from a rod-pumping system |
| 01/24/2002 | US20020007952 Cable actuated downhole smart pump |
| 01/23/2002 | CN2473358Y Oil pump capable of leaking and filling |
| 01/23/2002 | CN2473357Y Multiple rod linear oil pump unit |
| 01/17/2002 | WO2002004813A1 Water supply |
| 01/17/2002 | US20020005615 Piston rod seal assembly for walking beam compressor |
| 01/16/2002 | CN2471966Y Hydraulic compensated sandproof oil sucking pump |
| 01/10/2002 | WO2002002947A1 Isolation container for a downhole electric pump |
| 01/09/2002 | CN2470576Y Guide-bar-free hydraulic oil-pumping machine |
| 01/09/2002 | CN2470575Y Screw-bar type oil-pumping pump |
| 01/09/2002 | CN1330219A Oblique crankshaft drive unit and its application in IC engine, compressor, press and oil pump |
| 12/26/2001 | CN2467821Y Beam-pumping unit driven by linear motor |
| 12/26/2001 | CN2467791Y Steel cable lifting belt driving wheel for oil producing machine |
| 12/20/2001 | WO2001096708A1 Reciprocating windmill pumping system |
| 12/20/2001 | US20010052704 Turbogenerator power control system |
| 12/19/2001 | EP1163447A1 A positive-displacement pump |
| 12/19/2001 | CN2466385Y Fixed valve assembly of oil well pump |
| 12/19/2001 | CN2466384Y Super viscous crude electric heating rod type oil-well pump |
| 12/19/2001 | CN2466383Y Linear seal oil-well pump |
| 12/19/2001 | CN2466382Y Steel cable lifting belt driving device for oil production machine |
| 12/12/2001 | CN2464963Y Single crank energy-saving oil pump |