| 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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| 09/10/1997 | CN2262115Y Vacuum assembly of deep well pump |
| 09/03/1997 | CN2261519Y Input hydraulic piston pump |
| 09/02/1997 | US5662167 Oil production and desanding method and apparatus |
| 08/27/1997 | CN2260901Y Pressure-compensation type elastic sealing plunger piston |
| 08/27/1997 | CN2260900Y Hoisting-sheave type long-stroke oil-pumping machine |
| 08/26/1997 | US5660534 Rotating plunger for sucker rod pump |
| 08/26/1997 | US5660532 Multiphase piston-type pumping system and applications of this system |
| 08/20/1997 | CN2260181Y Pushing and extrusion type water pumping installation |
| 08/13/1997 | CN2259508Y Long increasing piston pipe pump |
| 08/13/1997 | CN2259507Y Automatic compensating anti-seizing up efficient oil pump |
| 08/13/1997 | CN1156791A Multifunctional oil-well pump and its regulator |
| 08/12/1997 | US5655604 Down-hole, production pump and circulation system |
| 08/05/1997 | US5654504 In a well |
| 07/30/1997 | CN2258547Y Crank connecting link type beam-free oil pumping machine |
| 07/29/1997 | US5651666 For extracting fluid from a formation in a borehole |
| 07/24/1997 | DE19616578C1 Drive head for rotary driven rod linkage for borehole pump |
| 07/16/1997 | CN1154733A Process and device for raising liquids from wells |
| 07/15/1997 | US5647208 Hydraulic pumping unit |
| 07/09/1997 | CN2257570Y Tubing extracting pump |
| 07/01/1997 | US5642990 Downhole pump apparatus |
| 06/18/1997 | CN2256472Y Rotary wear resistance plunger pump |
| 06/14/1997 | CA2192154A1 Regenerative hydraulic power transmission for down-hole pump |
| 06/10/1997 | US5636687 Rod pull down tool |
| 06/03/1997 | US5634521 Valve assembly for downhole hydraulically actuated pump |
| 05/28/1997 | CN2254960Y Water striking type automatic water pumping device |
| 05/27/1997 | US5632604 Down hole pressure pump |
| 05/21/1997 | CN2254491Y Planetary exhauster for removing cooking fumes |
| 05/13/1997 | US5628624 Pump barrel valve assembly including seal/actuator element |
| 05/13/1997 | CA2122694C Valve cage for a rod drawn positive displacement pump |
| 04/23/1997 | CN2252900Y Magnetic fluid sealing oil pump |
| 04/16/1997 | CN2252255Y Pumping well tubular column structure |
| 04/15/1997 | US5620048 Oil-well installation fitted with a bottom-well electric pump |
| 04/09/1997 | CN2251636Y Separate zone production synchronous oil pump |
| 04/09/1997 | CN2251635Y Automatic moment-changing stroke-increasing type beam |
| 04/09/1997 | CN2251634Y Hydrodynamic deep oil-well pump |
| 04/08/1997 | US5618169 Water well pump cylinder components |
| 04/02/1997 | CN2251042Y Anti-seizing sand retention device for oil field deep well pump |
| 03/20/1997 | WO1997010437A1 Wellhead drive brake system |
| 03/19/1997 | CN1145454A Automatic water pumping machine using multiple sorts of micro-energy |
| 03/13/1997 | DE19533046A1 Underground pump transmission, esp. for use in oil industry |
| 03/12/1997 | CN2249315Y Long-plunger type anti-sand oil-well pump |
| 03/12/1997 | CN2249314Y Pushing type water-delivery rocking water pump |
| 03/12/1997 | CN1144884A Ship-type beam-pumping unit |
| 03/05/1997 | EP0541801B1 Rotary compressor |
| 02/26/1997 | CN2248254Y Soft-axis deep well pump |
| 02/12/1997 | CN1034026C Reciprocating-hydraulic combined pumping device |
| 01/23/1997 | WO1997002403A1 Improvements in deep well pumping apparatus |
| 01/22/1997 | CN2245679Y Sealing anchor for rod pump |
| 01/14/1997 | US5592973 Pressure capture valve |
| 01/08/1997 | CN2244629Y Energy-saving pumping unit |
| 12/25/1996 | CN2243558Y Man-powered pushing-pulling water pump for irrigation |
| 12/25/1996 | CN1138667A Multiple-range oil-well pump |
| 12/25/1996 | CN1138666A incline shaft petroleum oil-well pump |
| 12/24/1996 | CA2062112C Deep well handpump |
| 12/18/1996 | CN2242981Y Injection-extraction-tube type pump |
| 12/11/1996 | CN1137612A Pumper |
| 12/03/1996 | US5580221 Motor drive circuit for pressure control of a pumping system |
| 11/13/1996 | CN2240060Y Spring energy-storage beam-pumping unit |
| 11/13/1996 | CN1135565A Rod-free screw-pump oil-extraction equipment |
| 11/12/1996 | US5573063 Deep well pumping apparatus |
| 11/12/1996 | CA1338695C Multi-phase pumping device with plunger and applications thereof |
| 11/07/1996 | WO1996035055A1 Vertically reciprocating pump |
| 11/06/1996 | CN2239512Y Double-cylinder reciprocating water pump |
| 10/30/1996 | CN1134515A Pumping unit for inclined and vertical shaft |
| 10/29/1996 | US5569021 Hydraulic pump with in-ground filtration and monitoring capability |
| 10/23/1996 | CN2238328Y Self-cooling floating water electric pump |
| 10/16/1996 | CN2237741Y Pneumatic pumping unit with oil gun for automatically controlling starting or stopping of oil pump |
| 10/16/1996 | CN2237740Y Combined pump barrel type oil pump capable of preventing from being seized by sand |
| 10/16/1996 | CN1133398A Durable submerged pump |
| 10/02/1996 | CN2236558Y Through-flow pump for sucking double times as filling |
| 10/02/1996 | CN2236557Y Fluid increasing well pump |
| 09/25/1996 | CN2236032Y Double diameter-changeable centrifugal oil-pumping machine |
| 09/25/1996 | CN1032878C Digital-control supercritical beam-pumping unit |
| 09/25/1996 | CN1032877C Energy-saving power device for sliding beam oil pump |
| 09/17/1996 | CA2112711C Hydraulic actuating system for a fluid transfer apparatus |
| 08/28/1996 | CN2233999Y Vacuum water pump |
| 08/21/1996 | CN2233472Y Underground oil-pumping air pump for oil pumping well |
| 08/14/1996 | CN1032553C Numerical control power equipment of beam type oil pumping machine |
| 08/14/1996 | CN1032552C Gas pressure regenerating type beam unit for thick oil |
| 07/31/1996 | CN2232092Y Suction pump driven by bicycle |
| 07/24/1996 | CN2231721Y Jet well pump set |
| 07/17/1996 | CN2231327Y Reciprocating vacuum universal water pump |
| 07/16/1996 | US5536150 Hydraulic-pneumatic stroke reversal system for pumping units, and its application in preferred embodiments |
| 07/10/1996 | CN2230832Y Water supplier |
| 07/09/1996 | CA2123784C Pump-off control by integrating a portion of the area of a dynagraph |
| 07/06/1996 | CA2140046A1 Oil well pump power unit |
| 06/26/1996 | CN2229980Y Structure of siphon type submersible pump |
| 06/26/1996 | CN2229979Y hydraulic tool for adjusting balance of oil prodn. machine |
| 06/25/1996 | US5528947 Rod pumping assembly |
| 06/19/1996 | CN2229551Y Water power automatic water lifting machine |
| 06/19/1996 | CN2229550Y Bottomhole reducer for oil well |
| 06/19/1996 | CN1124824A Reciprocating piston reversible recovery delivery pump |
| 06/12/1996 | CN1124317A Sand-proof sand extracting and oil pumping combining device |
| 06/05/1996 | CN2228663Y World time-piece |
| 06/04/1996 | US5522463 Downhole oil well pump apparatus |
| 05/29/1996 | CN2228144Y Pressure liquid-pumping device |
| 05/15/1996 | EP0711920A1 Liquid flow apparatus |
| 05/15/1996 | CN2227214Y Chain numeric beam-pump unit |
| 05/08/1996 | CN2226669Y Dismounting expansion screw |
| 05/08/1996 | CN2226668Y Oil cylinder with retarding mechanism |