| 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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| 05/08/1996 | CN2226667Y Main pressure regulating valve for hydraulic transmission power gear shift variable speed case |
| 05/08/1996 | CN2226661Y Sectional transportation pipe for liquid pump |
| 05/08/1996 | CN2226660Y Hand-operated pumping and air-blasting dual-purpose machine |
| 05/02/1996 | WO1996012866A1 System for pumping well fluids |
| 05/01/1996 | EP0709575A1 Liquid supply system |
| 05/01/1996 | CN2226162Y Multifunctional water-pumping device |
| 05/01/1996 | CN1031729C Permanent magnetic wax-proof oil pump |
| 04/24/1996 | CN2225559Y Secondary balance slide beam oil pump |
| 04/24/1996 | CN2225558Y Roller top driving digital control oil pump |
| 04/19/1996 | CA2118380A1 Heavy oil motor pump |
| 04/09/1996 | US5505258 Parallel tubing system for pumping well fluids |
| 04/03/1996 | EP0704599A1 Installation for oil well equipped with a downhole electrical pump |
| 04/03/1996 | EP0704025A1 Piston pump and applications therefor |
| 04/02/1996 | CA2089316C System for monitoring oil well performance |
| 03/31/1996 | CA2159556A1 Well equipment with well-bottom electric pump |
| 03/27/1996 | CN2223368Y Submersible pump for well use |
| 03/27/1996 | CN2223367Y Combined double acting wheel type beam-pumping unit |
| 03/20/1996 | CN1031354C Chain type long stroke oil pumping machine |
| 03/12/1996 | US5497832 Dual action pumping system |
| 02/28/1996 | CN1117555A Numerical control wind-power oil-pumping and water-injection combined equipment |
| 02/27/1996 | US5494102 Downhole hydraulically operated fluid pump |
| 02/07/1996 | CN2219388Y Sucker rod |
| 02/07/1996 | CN2219387Y Magnetic sealed oil-well pump |
| 02/07/1996 | CN1116276A Hydraulic pumping unit |
| 02/01/1996 | WO1996002731A1 Well purging and sampling pump |
| 01/09/1996 | US5481873 Hydraulic actuating system for a fluid transfer apparatus |
| 12/28/1995 | WO1995035445A1 Process and device for raising liquids from wells |
| 12/27/1995 | CN1030582C Water oil pumping device for sealed well |
| 12/20/1995 | CN2215608Y Improved chain type oil pump |
| 12/20/1995 | CN2215607Y Jetting-proof well pump |
| 12/12/1995 | CA2028617C Rod guide bearing assembly for oil well pumping apparatus |
| 11/07/1995 | US5464058 Method of using a polished rod transducer |
| 10/31/1995 | US5462115 For mounting within a well casing |
| 10/25/1995 | CN1110751A Mast type numerically controlled beam-pumping unit |
| 10/17/1995 | US5458466 Monitoring pump stroke for minimizing pump-off state |
| 10/11/1995 | CN2209724Y Beam gas exhauster |
| 10/10/1995 | US5456318 From a well |
| 10/04/1995 | CN1109560A Digital control oil pumping machine by using grouped traction belt |
| 10/04/1995 | CN1109559A Multiple junction reciprocating oil pumping device |
| 10/03/1995 | CA2039942C Self actuated intake valve assembly for insert subsurface reciprocating pumps |
| 09/21/1995 | WO1995025226A1 Piston pump and applications therefor |
| 09/19/1995 | US5450897 Rod pull down tool |
| 09/13/1995 | CN2207456Y Skewed tooth clasp block |
| 09/05/1995 | US5447416 Pumping device comprising two suction inlet holes with application to a subhorizontal drain hole |
| 09/05/1995 | US5447026 Hydraulic oil well pump drive system |
| 08/30/1995 | CN2206360Y Material-saving energy-saving oil pumping unit |
| 08/30/1995 | CN2206359Y Crank non-conventional type wheel oil pumping unit |
| 08/30/1995 | CN1107552A Oil pumping unit with crank and shaped wheel |
| 08/30/1995 | CN1029640C Low-speed start and run controller for beam pumping unit |
| 08/29/1995 | CA2116614A1 Hydraulic jack pump |
| 08/09/1995 | CN1029491C Hollow oil pump |
| 08/04/1995 | CA2114900A1 Rod pull down tool |
| 08/02/1995 | CN2204340Y Multi-stage worm oil-pumping machine |
| 07/19/1995 | CN2203719Y Pumping unit for double-well group |
| 07/14/1995 | CA2140070A1 Method and apparatus for utilizing the pressure of a fluid column generated by a pump to assist in reciprocating the pump plunger |
| 07/11/1995 | US5431229 Method and apparatus for utilizing the pressure of a fluid column generated by a pump to assist in reciprocating the pump plunger |
| 07/05/1995 | EP0660902A1 Submersible well probe sleeve |
| 07/05/1995 | CN2202807Y Simple rope connector for oil pump |
| 07/04/1995 | US5429193 Piston pump and applications therefor |
| 06/27/1995 | US5427504 Gas operated plunger for lifting well fluids |
| 06/20/1995 | US5425623 Rod pump beam position determination from motor power |
| 06/07/1995 | CN2200065Y Additional speed reducing device for routine oil pumping unit |
| 06/06/1995 | US5421711 Downhole pump drive system |
| 05/31/1995 | CN2199331Y Mechanical extended-range hydraulic pumping unit |
| 05/31/1995 | CN2199330Y Chain pumping unit without reversing frame |
| 05/31/1995 | CN2199329Y Fan-type pumping unit |
| 05/24/1995 | CN2198414Y Oil pump vice crank balancing device |
| 05/24/1995 | CN2198413Y Sliding beam type oil pump automatic balancing device |
| 05/24/1995 | CN2198412Y Oil pumping machine |
| 05/17/1995 | CN2197484Y Suction pump for thick oil |
| 05/17/1995 | CN2197483Y Water suction pump |
| 05/10/1995 | CN2196698Y Multi-function oil pump |
| 05/10/1995 | CN1102458A Reciprocating-hydraulic combined pumping device |
| 05/03/1995 | CN2196193Y Integral cylinder type piston ring oil pump |
| 05/02/1995 | US5411381 Reciprocating pump |
| 04/25/1995 | US5409356 Well pumping system with linear induction motor device |
| 04/20/1995 | WO1995010707A1 Subsurface pump with pump rod connected valve ball |
| 04/18/1995 | US5407333 Subsurface pump with pump rod connected valve ball |
| 04/12/1995 | CN2194423Y Energy-saving type hydaulic oil pump |
| 04/11/1995 | US5404943 Multiple pump assembly for wells |
| 04/11/1995 | US5404767 Driving mechanism |
| 04/05/1995 | CN2193940Y Chain beam-pumping unit |
| 04/05/1995 | CN2193939Y Numerical controlled derrick beam-pumping unit |
| 04/04/1995 | US5404061 Oil-filled motor protector |
| 04/04/1995 | CA2088160C Rotary compressor |
| 03/29/1995 | CN1028052C Pump control system for downhole motor-pump assembly and method of using same |
| 03/22/1995 | CN2192743Y Energy-saving front beam-pumping unit |
| 03/21/1995 | CA1334812C Fluid transfer device |
| 03/14/1995 | CA1334733C Latchable downhole pump assembly and method of oil production |
| 03/14/1995 | CA1334732C Downhole pump assembly and method of oil production |
| 03/08/1995 | CN2191299Y Double beam-pumping unit |
| 03/08/1995 | CN2191298Y Stud ring transmission bidirectional oil pumping unit |
| 02/23/1995 | WO1995005539A1 Assembly for extracting crude oil |
| 02/22/1995 | CN2190175Y Oil sucker |
| 02/15/1995 | CN2189658Y Double-directional Sand-proof oil-well pump |
| 02/08/1995 | CN2189218Y Hydraulic oil pumping machine |
| 02/08/1995 | CN2189201Y Numerically controlled oil pumping machine with classification hauling belt |
| 02/08/1995 | CN1098479A Digital-controlled wind power oil pumping unit |
| 02/01/1995 | CN2188662Y Stud ring driving beam-pumping unit |
| 01/29/1995 | CA2101473A1 Pumpjack epicyclic drive |