| 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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| 03/23/1989 | EP0201492A4 Hydraulically driven downhole pump. |
| 03/21/1989 | US4813485 Gas and oil well pumping or swabbing device and method |
| 03/08/1989 | CN2033863U Long stroke oil-well pump |
| 03/07/1989 | US4810172 Gas-operated positive displacement pump |
| 02/14/1989 | CA1249965A2 Downhole well pump |
| 02/14/1989 | CA1249964A2 Downhole well pump |
| 02/08/1989 | CN2032262U Manual vacuum deep-well pump |
| 01/24/1989 | CA1249219A1 Servicing device for oil well rod pumps |
| 01/04/1989 | CN2030264U Convenient water draw-off pump |
| 12/28/1988 | CA1247518A Dewatering apparatus |
| 12/14/1988 | EP0294373A1 Well pump |
| 12/14/1988 | CN87213340U Pump both for injecting gas and extracting oil |
| 12/07/1988 | CN88100284A Drum-type long stroke oil sucking machine |
| 12/06/1988 | US4789031 Copper, zinc, nickel, lead and tin alloy; corrosion resistance, antiscaling |
| 12/06/1988 | US4788873 Portable walking beam pump jack |
| 11/30/1988 | CN88203946U Suction energy compensation system for deep well pipe pump |
| 11/23/1988 | CN87103481A Long stroke beam-pumping unit with chain without sliding beam |
| 11/16/1988 | CN87210695U Pressurized type deep-well pump |
| 11/02/1988 | CN87212190U Hand pump for deep well |
| 11/01/1988 | US4781547 Gas equalizer for downhole pump |
| 11/01/1988 | US4781543 Artificial lift system for oil wells |
| 11/01/1988 | CA1243899A1 Down hole pump having a gas release valve |
| 10/18/1988 | US4778355 Well pump system |
| 10/05/1988 | CN87212785U Small-sized water pump for deep well |
| 09/13/1988 | US4770614 Apparatus for transferring fluid medium |
| 09/06/1988 | US4769156 Method and means to pump a well |
| 09/06/1988 | US4768595 Oil recovery apparatus using an electromagnetic pump drive |
| 09/06/1988 | US4768589 Downhole hydraulic actuated pump |
| 08/30/1988 | US4767291 Single valve pump |
| 08/30/1988 | US4767290 Fluid pump |
| 08/24/1988 | EP0118497B1 Hydraulically actuated bore and well pump |
| 08/23/1988 | US4766103 Mixture of aluminum halide, iodine, alkaline earth halide or sulfate, or lanthanide halide; catalyst selectivity |
| 08/23/1988 | US4765144 Solar-powered Rankine cycle pumping engine |
| 08/10/1988 | CN87211625U Side-rotation hinge device for "donkey head" of oil-pumping unit |
| 08/09/1988 | US4762474 Pump having reciprocating pipe and slidably supported hollow body |
| 08/09/1988 | US4762473 Pumping unit drive system |
| 08/03/1988 | EP0276228A1 Two stage pump sampler |
| 08/02/1988 | US4761120 Well pumping unit and control system |
| 08/02/1988 | CA1239869A1 Groundwater monitoring system |
| 07/26/1988 | US4759407 Inverted working barrel and seat and method of manufacturing the same |
| 07/19/1988 | US4757878 Method and system for lubrication |
| 07/19/1988 | CA1239309A1 Ribbon rod for oil well pumping systems |
| 07/13/1988 | CN87209044U Tower type extended-range oil-pumping unit with single arm sliding beam |
| 06/29/1988 | CN87202970U 自由气体活塞泵 Free gas piston pump |
| 06/28/1988 | CA1238519A1 Hydraulically driven downhole pump |
| 06/16/1988 | WO1988004365A1 Well pump |
| 06/14/1988 | US4750865 Subsurface stuffing box assembly |
| 06/08/1988 | CN86108175A Crank pressure-cylinder type hydraulic oil pump |
| 06/08/1988 | CN85204669U Vacillating beam type oil drawing machine mechanically balanced by combined handing point loading and covertible moment |
| 06/07/1988 | US4749337 Reciprocating bladder pump, and methods of constructing and utilizing same |
| 05/24/1988 | US4745969 For operating well bottom pumping units |
| 05/11/1988 | EP0266400A1 High efficiency pump method and apparatus with hydraulic actuation |
| 05/11/1988 | CN87213572U High-head deep-well driven by manpower |
| 05/11/1988 | CN87213287U Long-stroke oil well pump unit |
| 05/11/1988 | CN87103304A The oil drawer with self changing forque |
| 05/10/1988 | US4743172 Belt driven pumping unit |
| 05/03/1988 | CA1235948A1 Downhole well pump and method |
| 03/16/1988 | CN87105369A Adjustable out-of-phase crank balanced oil extractor and related method |
| 03/01/1988 | US4727760 Connection between the equalizer beam and the walking beam of a walking beam type oil well pumping unit |
| 02/23/1988 | US4726743 Hydraulically driven downhole pump |
| 02/16/1988 | US4724672 Energy storing hydraulic lift pump for oil wells |
| 02/09/1988 | US4723452 Belt driven pumping unit |
| 02/02/1988 | CA1232194A1 Downhole well pump |
| 01/26/1988 | US4720978 Solar-powered rankine cycle pumping engine |
| 01/26/1988 | CA1231865A1 Well pumping unit |
| 01/20/1988 | EP0252972A1 A pump arrangement, particularly for pumping water from deep wells |
| 01/19/1988 | US4720247 Oil well pump |
| 01/19/1988 | US4719811 Well pumping unit with counterweight |
| 01/12/1988 | US4718824 Usable device, in particular for the pumping of an extremely viscous fluid and/or containing a sizeable proportion of gas, particularly for petrol production |
| 12/29/1987 | US4715794 Bottom-hole pump fluid flow controller |
| 12/29/1987 | US4715240 Pumping device |
| 12/22/1987 | US4714110 Device to relieve sucker rod torque below ground level in a petroleum well |
| 12/17/1987 | WO1987007684A1 A fluid pump |
| 12/16/1987 | EP0248847A1 Well pump |
| 12/15/1987 | US4712981 Pressure-operated valving for oil and gas well swabs |
| 12/15/1987 | US4712374 Hydraulic pump jack |
| 12/08/1987 | CA1230010A1 Sucker rods |
| 12/05/1987 | CN86209054U Anti-sand oil pump |
| 12/05/1987 | CN86208160U Sand-proof oil pump |
| 12/02/1987 | EP0179793B1 Hydraulic piston pump for pumping liquids |
| 11/24/1987 | US4707993 Pumping apparatus |
| 11/11/1987 | CN86103075A Down hole reverse up flow jet pump |
| 11/05/1987 | WO1987006653A1 High efficiency pump method and apparatus with hydraulic actuation |
| 11/03/1987 | US4703665 Well pumping unit |
| 10/20/1987 | US4701107 Two stage pump sampler |
| 10/19/1987 | EP0202221A4 Method and means to pump a well. |
| 10/13/1987 | US4698968 Pumping unit |
| 10/08/1987 | WO1987005974A1 Two stage pump sampler |
| 10/03/1987 | CN86201668U Walking beam type chain driven oil pump |
| 10/03/1987 | CN86200614U Rope length adjustor for oil pump |
| 09/29/1987 | US4696624 Casing pump |
| 09/29/1987 | US4696221 Dual valve control for double action hydraulic cylinder |
| 09/23/1987 | CN86208448U Cylinder and casing structure for pipelike oil extraction pump |
| 09/15/1987 | US4693171 Position responsive valve control for hydraulic cylinder |
| 09/09/1987 | EP0105877B1 Pump for liquids and gases |
| 09/09/1987 | CN86204120U Submerged pump made of fluoroplastics |
| 09/08/1987 | US4691511 Hydraulic well pump |
| 08/25/1987 | US4688999 Well pump |
| 08/18/1987 | US4687420 Sonic pressure wave pump with liquid heating and elevating mechanism |
| 08/18/1987 | US4687054 Linear electric motor for downhole use |