| 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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| 09/13/2000 | CN2396205Y Reciprocating man-power lifting oil pump for producing oil |
| 09/13/2000 | CN2396204Y Mechanical valve type electrothermic pump for ultra-thickened oil |
| 09/13/2000 | CN2396203Y Water pump energy-saver without draining tube |
| 09/13/2000 | CN1056436C Multi-range petroleum pump |
| 09/12/2000 | US6116025 Dynamic, automatic stroke reversal system for reciprocating, linearly driven pumping units |
| 09/06/2000 | CN2395058Y Under well sand remover for deep well pump |
| 09/06/2000 | CN2395056Y Backward blade self turning windmill wind force water pump |
| 09/06/2000 | CN2395055Y Multifunction complex test diagnostic instrument for oil pumping unit |
| 09/06/2000 | CN2395054Y Single plunger double function oil pump |
| 09/05/2000 | US6113355 Pump drive head pump assembly with a hydraulic pump circuit for preventing back-spin when the drive head has been shut off |
| 09/05/2000 | US6112607 Slant hole pumping unit |
| 08/31/2000 | WO2000050774A1 A positive-displacement pump |
| 08/23/2000 | EP1029178A1 Drive head for a rotary-driven rod assembly, especially for driving a sand pump |
| 08/16/2000 | CN2392003Y Non-balance beam type bevel gear well pumping unit |
| 08/16/2000 | CN2392002Y Non-balance beam type cylindrical gear well pumping unit |
| 08/09/2000 | EP1025359A1 Hydraulic pump jack drive system for reciprocating an oil well pump rod |
| 08/09/2000 | CN2391029Y Stong spring sandproof clamp oil well pump |
| 08/09/2000 | CN2391028Y Meander ridge pumping well |
| 08/09/2000 | CN2391027Y Efficient sandproof barrel oil well pump plunger |
| 08/08/2000 | US6099274 Pump to surface pump |
| 08/02/2000 | CN2390026Y Preventer type pumping rod connecting-and-unconnecting device |
| 08/02/2000 | CN2390025Y Two-channel countercirculation sand-carrying oil-well pump |
| 08/02/2000 | CN2390024Y Gasproof oil-well pump |
| 08/01/2000 | CA2201954C Rotating piston for sucker rod pump |
| 07/26/2000 | CN2389242Y Adjustable high-efficiency energy-saving oil pump |
| 07/12/2000 | CN2387284Y Whole balance sliding-beam type pumping unit |
| 07/12/2000 | CN2387283Y Dischargeable oil-well pump |
| 07/12/2000 | CN2387282Y Oil-well pump with sands-proof check |
| 07/11/2000 | US6086339 Solar-powered reciprocating pump |
| 07/08/2000 | CA2258237A1 Hydraulic submersible bottom pump actuator |
| 07/05/2000 | CN2386214Y Beam-pumping unit for puming underground petroleum |
| 07/05/2000 | CN2386213Y Dual well self-balance compound wheel pumping unit |
| 06/28/2000 | CN2385106Y Chain type energy-saving beam-pumping unit |
| 06/28/2000 | CN2385105Y Sand-proof oil-well pump |
| 06/28/2000 | CN2385104Y Chain beam-pumping unit |
| 06/28/2000 | CN2385103Y Three valve moving cylinder sand-proof pump |
| 06/28/2000 | CN2385102Y Multifunctional oil-well pump |
| 06/21/2000 | CN2384002Y Heavy beam-pumping unit |
| 06/21/2000 | CN2384001Y Spin plunger anti-seizing oil pump |
| 06/21/2000 | CN2384000Y Three-horse head pumping unit |
| 06/21/2000 | CN1257161A Composite plunger type bore hole pump |
| 06/20/2000 | CA2231321C Real-time pump optimization system |
| 06/14/2000 | CN2382857Y Automatic anchoring pipe pile of oil pumping well pipeline |
| 06/14/2000 | CN2382856Y Energy saving oil pumping unit |
| 06/14/2000 | CN2382855Y Connector for multiple well machine pump |
| 06/14/2000 | CN1256362A Curved beam pumping unit |
| 06/07/2000 | CN2381811Y All status regulating hydraulic oil sucker |
| 06/07/2000 | CN1256021A Motor for submerged pump |
| 05/31/2000 | CN2380718Y Rod-type heat oil-extraction oil-pump |
| 05/31/2000 | CN2380717Y Linkage oil-pump |
| 05/24/2000 | CN2379621Y Piston type water pump |
| 05/23/2000 | US6065537 Rod guide with both high erodible wear volume and by-pass area |
| 05/17/2000 | CN1253228A Full-balanced long-stroke pumping unit with flexible drive parts |
| 05/11/2000 | DE19849756A1 Antriebskopf für ein drehantreibbares Gestänge, insbes. zum Antreiben einer Bohrlochpumpe Drive head for a rotatably driven linkage, esp. For driving a downhole pump |
| 05/11/2000 | DE19849512A1 Combination pump comprising suction pump and compressor has suction pump, compressor and drive source located in housing, forming compact unit |
| 05/10/2000 | CN2377378Y Quick assembling-and-disassembling adjustable lower bias balancing arm type pumping unit |
| 05/04/2000 | WO2000025026A1 Submersible pump for use in a bore hole |
| 05/04/2000 | WO2000025000A1 Drive head for a rotary-driven rod assembly, especially for driving a sand pump |
| 05/04/2000 | DE19848792C1 Tauchpumpeneinrichtung zur Verwendung in einem Bohrloch Submersible pump device for use in a wellbore |
| 05/04/2000 | CA2316792A1 Drive head for a rotary-driven rod assembly, especially for driving a sand pump |
| 04/27/2000 | CA2279320A1 Turbogenerator power control system |
| 04/18/2000 | US6050789 Pump-in-pipe |
| 04/14/2000 | CA2286502A1 Submersibly driven reciprocating pump |
| 04/13/2000 | WO2000020758A1 Bob system for alternating pumps |
| 04/05/2000 | CN2372481Y Dual well self-balanced composite wheel beam-pumping unit |
| 04/05/2000 | CN2372480Y Adjustable chain beam-pumping unit |
| 04/04/2000 | US6045335 Differential pressure operated free piston for lifting well fluids |
| 04/04/2000 | US6045333 Method and apparatus for controlling a submergible pumping system |
| 03/29/2000 | CN2371367Y Involute double hoisting sheave pumping unit |
| 03/25/2000 | CA2248484A1 Back spin swivelling device for a progressive cavity pump |
| 03/22/2000 | CN2370191Y Oil production tube type pump air-proof increasing effect plunger device |
| 03/22/2000 | CN2370190Y Hydraulic walking beam free oil pump |
| 03/22/2000 | CN2370189Y Conventional well-flushing well anti-sand oil pump |
| 03/22/2000 | CN2370188Y Double chain synchronous drive oil pump |
| 03/22/2000 | CN2370187Y Pressure water pump unit |
| 03/22/2000 | CN1050651C Rod-free screw pump oil extraction equipment |
| 03/22/2000 | CA2248293A1 Reservoir fluids production apparatus and method |
| 03/21/2000 | US6039544 Oil lift system |
| 03/15/2000 | EP0986161A1 Motor for submerged pump |
| 03/15/2000 | CN2369004Y Two track chain oil sucker |
| 03/15/2000 | CN2369003Y Anti-sand pump for thick oil |
| 03/15/2000 | CN1247277A Multifunctional efficient oil-well pump |
| 03/11/2000 | CA2246850A1 Flow responsive time delay pump motor cut-off logic |
| 03/08/2000 | CN2367797Y Tubelike integral oil-pump without jointing hoop |
| 03/08/2000 | CN2367796Y Double-valve combined-tube type oil pump |
| 03/08/2000 | CN2367795Y 抽油泵 Pump |
| 03/08/2000 | CN2367794Y Antitheft braking apparatus for oil pump |
| 03/08/2000 | CN1050174C Numerical control wind-power oil-pumping and water-injection combined equipment |
| 03/07/2000 | US6033192 Fluid transfer system |
| 03/01/2000 | CN2366583Y 实心柱塞抽油泵 Solid plunger pump |
| 03/01/2000 | CN2366582Y Magnetic vibration increasing valve for well pump |
| 02/29/2000 | US6031294 Turbogenerator/motor controller with ancillary energy storage/discharge |
| 02/23/2000 | CN1245243A Parameters design method for mechanically oil-producing technology with rod pump. |
| 02/16/2000 | CN2364243Y Feedback viscous crude pump |
| 02/16/2000 | CN2364242Y Natural pressure vacuum water pump |
| 02/16/2000 | CN2364241Y Screw and pumping unit |
| 02/09/2000 | CN2363086Y Easy-adjusting hanging balance device for oil pump |
| 02/09/2000 | CN2363085Y Piston type flow-boosting water pump |
| 02/09/2000 | CN2363084Y Oil pump |
| 02/09/2000 | CN2363083Y Gasoline water-pumping machine |