| 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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| 03/08/2001 | WO2001016487A1 A pumping unit |
| 03/07/2001 | CN1286357A Full-autometic oil producing unit |
| 03/07/2001 | CN1286356A Low-height pumping unit with cylindrical chain and long stroke |
| 03/06/2001 | US6196312 Dual pump gravity separation system |
| 02/28/2001 | CN2421429Y Double-pump mutual balance pumping unit |
| 02/28/2001 | CN2421428Y Balance weight for beam-pumping unit |
| 02/28/2001 | CN2421427Y Gap compensated self-sealed oil pump |
| 02/27/2001 | US6193476 1½ Piston force pump |
| 02/20/2001 | CA2255603C Hydraulic pump jack drive system for reciprocating an oil well pump rod |
| 02/15/2001 | WO2001011187A1 Pump systems and methods |
| 02/14/2001 | CN1283747A Load reducer for petroleum well |
| 02/07/2001 | CN2418272Y Feed back hydraulic potentiating device for oil-pumping pump |
| 02/07/2001 | CN2418271Y Low-short special-shaped oil-pumping machine |
| 02/07/2001 | CN1061739C Electric machine commutating long stroke beam unit |
| 01/31/2001 | CN2417304Y Anti blowout type pump |
| 01/31/2001 | CN2417303Y Hydraulic feed-back type oil pump |
| 01/31/2001 | CN2417302Y Oil pump able to pump oil together with mud |
| 01/31/2001 | CN2417301Y Rod type pump |
| 01/25/2001 | WO2001006125A1 A mechanical oil recovery method and system with a sucker rod pump |
| 01/24/2001 | CN2416250Y Archless Non-standing pump valve non-cavitation and non-sand stuck oil-well pump with pipette |
| 01/24/2001 | CN2416249Y Pipe type sandproof oil-well pump |
| 01/24/2001 | CN2416248Y Non-rod pumping unit |
| 01/24/2001 | CN2416247Y Six-connecting bar self-balancing energy-saving pumping unit |
| 01/24/2001 | CN1281097A Sand-resistant oil-well pump |
| 01/23/2001 | US6176682 Pumpjack dynamometer and method |
| 01/23/2001 | US6176309 Bypass valve for gas lift plunger |
| 01/23/2001 | CA2278827A1 Single string reciprocating pump system |
| 01/17/2001 | CN2415175Y Long stroke pumping unit with inside engaged planetary gear to form linear motion |
| 01/17/2001 | CN2414853Y Hydrodynamic sound wave antiscaling device |
| 01/16/2001 | US6173768 Method and apparatus for downhole oil/water separation during oil well pumping operations |
| 01/10/2001 | CN2414220Y Low-pressure high-efficiency oil pump |
| 01/10/2001 | CN2414219Y Easy repairing type integral cylinder sand-proof oil pump |
| 01/10/2001 | CN2414218Y Power box for oil pumping machine |
| 01/10/2001 | CN1279353A Friction-driven self-locking roll-type pumping unit |
| 01/10/2001 | CN1279337A Bidirectionally normal opened spherical uniflow valve able to discharge sand |
| 01/04/2001 | WO2001000991A1 An oil pumping unit |
| 01/03/2001 | CN2413060Y Directional hard closing oil well pump |
| 01/03/2001 | CN2413059Y Double-pump composite selective zone production device |
| 01/03/2001 | CN2413058Y Ejector type air lock preventing oil well pump |
| 01/03/2001 | CN2413057Y Model 8395 oil-well pump with bleeder connecting-tripping device |
| 12/28/2000 | WO2000079130A1 Vibratory pump improvement |
| 12/27/2000 | EP0890025A4 Sucker rod pump actuating device |
| 12/27/2000 | CN2412105Y Linear motor driven non-beam pumping unit |
| 12/27/2000 | CN1278317A Drive head for rotary-driven rod assembly, especially for driving sand pump |
| 12/26/2000 | US6164936 Vertical reciprocating pump having easily installed piston with flap valves |
| 12/26/2000 | US6164935 Walking beam compressor |
| 12/26/2000 | US6164376 Triple action pumping system and method |
| 12/20/2000 | CN2411357Y Oil well associated gas power beam-pumping unit |
| 12/20/2000 | CN2411356Y Long-pumping-process non-beam beam-pumping unit |
| 12/13/2000 | CN2410443Y Pulse beam-pumping unit |
| 12/12/2000 | CA2201987C A device with coaxial, opposite, modular pistons with double eccentric cams or similar, for floated pumps |
| 12/06/2000 | CN2409351Y Beam pump driven by ac linear motor |
| 12/05/2000 | US6155803 Rodless pumping system |
| 12/05/2000 | US6155792 Wireline retrievable oilwell pumping system |
| 12/05/2000 | CA2282214C Stowable walking beam pumping unit |
| 11/28/2000 | US6152231 Wellhead drive brake system |
| 11/22/2000 | CN2407160Y Controller for crude oil worked-out |
| 11/22/2000 | CN2407159Y Rod oil sucker against blowout |
| 11/22/2000 | CN2407158Y Speed changing energy saving drive for oil sucker |
| 11/22/2000 | CN2407157Y Free beam oil sucker and balancing structure for load varying device |
| 11/22/2000 | CN2407156Y Easily balanced oil sucker with inclined suspension free beam |
| 11/15/2000 | CN2406084Y Top-driven type oil-pumping machine |
| 11/14/2000 | CA2158514C Method and apparatus for intermittent production of oil with a mechanical interface |
| 11/09/2000 | WO2000066892A1 Pump-off control for pumping jack |
| 11/08/2000 | CN2405036Y Non-rod type hydraulic oil pumping machine |
| 11/08/2000 | CN2405035Y Blocking-proof and high-temp. resistance type rod like pump |
| 11/07/2000 | US6142224 Triple action pumping system with plunger valves |
| 11/01/2000 | CN2403917Y Oil well casting pump with free plunger lifting the fluid to the surface |
| 11/01/2000 | CN2403916Y Short-pump cylinder long-plunger gas injection thermal recovery pump |
| 11/01/2000 | CN2403911Y Liquid control solar-energy photoelectric water pump |
| 10/26/2000 | CA2270017A1 Rotary pump top drive |
| 10/25/2000 | CN2402829Y Hydraulic driven pumping unit without beam and tower |
| 10/25/2000 | CN2402828Y Low-load wide-range light energy-saving pumping unit |
| 10/24/2000 | US6135203 Downhole reciprocating plunger well pump |
| 10/18/2000 | EP1044333A1 Submersible pump for use in a bore hole |
| 10/18/2000 | CN2401708Y Integral cylinder type oil pump |
| 10/11/2000 | EP1042586A1 Drive head for a rotary-driven rod assembly, especially for driving a sand pump |
| 10/11/2000 | CN2400602Y Beam-pumping unit hydrodynamic clutch-locking band combined driving device |
| 10/11/2000 | CN2400601Y Five-connecting-rod beam-pumping unit |
| 10/11/2000 | CN2400600Y Safety deep-well oil pump |
| 10/11/2000 | CN2400599Y Direct-balancing energy-saving beam-pumping unit |
| 10/11/2000 | CN2400598Y Double-process beam-pumping unit-double-plunger oil-well pump device |
| 10/11/2000 | CN1269454A Equipotential energy machine oil expoiting technology utilizing double oil wells and no pumping unit |
| 10/04/2000 | EP1041280A1 Deep well pump |
| 10/04/2000 | CN2399531Y Hydraulic feedback anti-sand pump for flexible continuous sucker rod |
| 10/04/2000 | CN2399530Y Ring drainage electrical underwater screw pump oil extracting unit |
| 10/04/2000 | CN2399529Y Long stroke gearing reversing device beam-pumping unit |
| 10/04/2000 | CN2399528Y Large displacement rod type, tube type pump |
| 10/04/2000 | CN2399527Y Rotary-vane underpit oil extracting appts. |
| 10/04/2000 | CN2399526Y Underpit sucker-rod plunger oil well pump using oil tube as pump cylinder |
| 10/04/2000 | CN1268626A Pumping-up pump |
| 09/27/2000 | EP1039133A1 Bob system for alternating pumps |
| 09/27/2000 | CN2398442Y Negative-pressure pulse deep well oil production pump device |
| 09/27/2000 | CN2398441Y Pneumatic energy-saving beam type energy-saving beam-pumping unit |
| 09/27/2000 | CN2398440Y Engaging and disengaging gear for beam-pumping unit |
| 09/27/2000 | CN2398439Y Gathering and transportation pump for thickened oil containing sand |
| 09/20/2000 | CN2397282Y Short plunger oil-well pump |
| 09/20/2000 | CN2397281Y Blowout preventing oil-well pump |
| 09/20/2000 | CN2397255Y Fixed valve for oil-well pump |
| 09/19/2000 | US6119781 Method of operating an oil and gas production well activated by a pumping system |