| 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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| 02/02/2000 | CN1243200A Metal elastic-sealed oil pump |
| 01/26/2000 | CN2360635Y Well rod oil-well pump |
| 01/26/2000 | CN2360634Y Differential beam-pumping unit |
| 01/26/2000 | CN2360633Y Multifunctional oil-well pump |
| 01/26/2000 | CN1242475A Blowing-out proof type oil prodn. pump |
| 01/26/2000 | CN1242474A Synchronous, torque-variation, balancing beam type machine for pumping oil from deep well |
| 01/19/2000 | EP0840835A4 Improvements in deep well pumping apparatus |
| 01/18/2000 | US6015271 Stowable walking beam pumping unit |
| 01/12/2000 | CN2358251Y Upper cross-beam torque-changed balanced beam type pumping machine |
| 01/12/2000 | CN2358250Y Beamless circular rotary oil-pumping machine |
| 01/05/2000 | CN2357153Y Rotary energy-saving pumping unit |
| 01/05/2000 | CN2357152Y Leather belt stretching wheel for pumping unit |
| 01/05/2000 | CN1048076C Hydraulic pumping unit |
| 12/29/1999 | CN2356162Y Weighing super low consumption double well oil pumping machine |
| 12/29/1999 | CN2356141Y Casing swabbing tool for oil-water well |
| 12/28/1999 | US6007314 Downhole pump with standing valve assembly which guides the ball off-center |
| 12/22/1999 | CN2355130Y Airtight oil pump valve |
| 12/22/1999 | CN2355129Y Long-range oil sucker |
| 12/21/1999 | US6004114 Hydraulic submersible pump for oil well production |
| 12/16/1999 | WO1999064742A1 Fluid well pump |
| 12/15/1999 | CN2353936Y Oil pump |
| 12/15/1999 | CN2353935Y Multifunction oil pump |
| 12/15/1999 | CN2353934Y Oil-pump for deep well |
| 12/15/1999 | CN2353933Y Inner-pipe injection-extraction pump |
| 12/15/1999 | CN2353932Y Load reducer for oil-pumping machine |
| 12/15/1999 | CN2353931Y Nipple joint for force-measurement of oil-tubing of oil pump |
| 12/08/1999 | CN2352726Y Full balancing and long stroke well pump having flexible driving parts |
| 12/08/1999 | CN2352725Y Tower frame type well pump |
| 12/08/1999 | CN2352724Y Chain type direction change well pump |
| 12/08/1999 | CN2352723Y Mechanical balancing adjustment device for well pump in mechanical oil prodn. system |
| 12/08/1999 | CN2352722Y Same direction circulation, chain driven and no-load protective type oil pumping machine |
| 12/08/1999 | CN2352672Y High efficiency oil pumping machine |
| 12/07/1999 | US5997181 Hydraulic oil well pump drive system |
| 12/07/1999 | US5996688 Hydraulic pump jack drive system for reciprocating an oil well pump rod |
| 12/01/1999 | EP0961395A2 Automatic restart control for a submersible pump |
| 12/01/1999 | CN2351592Y Air compressing piston lift pump |
| 12/01/1999 | CN2351591Y Heavy-hammer balance chain oil pumping machine |
| 12/01/1999 | CN2351590Y Multi-function oil well pump |
| 11/30/1999 | US5992517 Downhole reciprocating plunger well pump system |
| 11/30/1999 | US5992452 Ball and seat valve assembly and downhole pump utilizing the valve assembly |
| 11/24/1999 | CN2350561Y Valvular high-efficiency sand pump |
| 11/24/1999 | CN2350560Y Epicyclic transmission enlarged stroke beam pumping unit |
| 11/24/1999 | CN2350559Y Double lifting machinery-driven petroleum drill |
| 11/23/1999 | US5988996 Electrical shaft grounding brush assembly and holder for a submersible pump motor |
| 11/17/1999 | CN2349380Y Hydraulic coupling type oil pump |
| 11/17/1999 | CN2349379Y Low ecentric barbell type walking beam composite balance oil pump |
| 11/17/1999 | CN1046571C Method and apparatus for raising liquid from wells |
| 11/16/1999 | US5984013 Plunger arrival target time adjustment method using both A and B valve open times |
| 11/10/1999 | CN2348145Y Stroke-adjusting device for beam-pumping unit |
| 11/10/1999 | CN2348144Y Double-stroke oil-well pump |
| 11/10/1999 | CN2348143Y Full-balancing chain wheel oil-pumping unit |
| 11/10/1999 | CN2348142Y Vacuum ground oil pump |
| 11/10/1999 | CN2348141Y Energy-saving strong suction water lifting pump |
| 11/10/1999 | CN2348140Y Program-control reciprocating beam-pumping unit |
| 11/03/1999 | CN2346957Y Ram pipe oil-well pump |
| 10/27/1999 | CN2345731Y Mechanical pump coaxial energy-saving self-priming water pump |
| 10/27/1999 | CN2345730Y Three-donkey-head long-stroke beam-pumping unit |
| 10/27/1999 | CN2345679Y Underground travel increasing apparatus for sucker rod |
| 10/26/1999 | US5973465 Automotive restart control for submersible pump |
| 10/20/1999 | EP0823962B1 Vertically reciprocating pump |
| 10/14/1999 | WO1999039422A9 Motor for submerged pump |
| 10/13/1999 | CN2343379Y Balance type economic energy-saving pumping unit |
| 10/06/1999 | CN2342133Y Oil pump for exhausting liquid from oil casing annulus cavity |
| 10/06/1999 | CN2342132Y Water leading device for well |
| 10/06/1999 | CN2342131Y Telescopic frame raised stroke oil pump |
| 10/06/1999 | CN1230635A Program-controlled reciprocating beam-pumping unit |
| 10/05/1999 | US5960875 Electric pump having a linear motor |
| 09/29/1999 | CN2340941Y Pull-push mill for pump water |
| 09/29/1999 | CN2340940Y Drum winding oil sucker |
| 09/29/1999 | CN2340939Y Oil sucking pump with bottom fixed sealing for anti-seizing rod by sands |
| 09/29/1999 | CN2340938Y Symmetrical convertible hydraulic piston pump without core |
| 09/29/1999 | CN1229886A Dual-speed energy saving beam-pumping unit with shaped wheel |
| 09/22/1999 | CN2339789Y Electromechanic integrated oil-delivery pump |
| 09/22/1999 | CN2339788Y Multifunction thick-oil pump |
| 09/22/1999 | CN2339787Y Rocking-arm type reciprocating type oil-pumping machine |
| 09/22/1999 | CN2339786Y Low-energy-consumption oil-pumping machine |
| 09/15/1999 | CN2338511Y Tubular soft plunger well pump |
| 09/14/1999 | CA2171028C Well water recirculation valve |
| 09/08/1999 | CN2337330Y Electromechanical exhauster for removing cooking fumes |
| 09/01/1999 | CN2336113Y Double mule head beam pumping unit |
| 09/01/1999 | CN2336112Y Long-plunger self-release oil well pump |
| 08/25/1999 | CN2334913Y Plunger type submerged deep well pump |
| 08/25/1999 | CN2334912Y All balance vertical oil pump |
| 08/25/1999 | CN2334911Y All balance beam type oil pump |
| 08/25/1999 | CN2334910Y Arm changeable beam type energy-saving oil pump |
| 08/25/1999 | CN2334909Y Blowout-preventing sand-proof rod-clamping type pump |
| 08/25/1999 | CN2334908Y Reciprocative bidirection vacuum pump for lifting water |
| 08/25/1999 | CN2334907Y Stroke times adjustable oil pump |
| 08/25/1999 | CN2334906Y Rope hanger |
| 08/11/1999 | CN1225421A Vertical Alternating pump with flat pistons |
| 08/10/1999 | US5934372 Pump system and method for pumping well fluids |
| 08/05/1999 | WO1999039422A1 Motor for submerged pump |
| 07/28/1999 | CN2330809Y Viscose oil pump for prevention of sand plug |
| 07/21/1999 | CN2329791Y Double-chain weight balance beam-pumping unit |
| 07/21/1999 | CN2329790Y Non-spool differential reversing-type hydraulic piston pump |
| 07/21/1999 | CA2227707A1 Control apparatus for a pump |
| 07/20/1999 | US5925825 For use in a liquid pumping system |
| 07/20/1999 | CA2161504C Method and apparatus for slowing back spin of a rod string of a progressing cavity pump powered by an electric motor when power is lost |
| 07/14/1999 | CN1222647A Ball and seat valve assembly and downhole pump utilizing said valve assembly |
| 07/13/1999 | US5921320 Process and device for raising liquids from wells |