| Patents for F04B 47 - Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps (5,485) |
|---|
| 09/30/1998 | CN1194335A Head sheave type long stroke well pumping unit |
| 09/29/1998 | US5813469 Coupled downhole pump for simultaneous injection and production in an oil wheel |
| 09/29/1998 | CA2137095C Downhole pump drive system |
| 09/29/1998 | CA2110163C Pump control system for a downhole motor-pump assembly and method of using same |
| 09/23/1998 | CN2292173Y Rod type oil pump |
| 09/22/1998 | CA2093466C Method and apparatus for variable speed control of oil well pumping units |
| 09/15/1998 | US5807082 Automatic downhole pump assembly and method for operating the same |
| 09/12/1998 | CA2231662A1 Coupled downhole pump for simultaneous injection and production in an oil well |
| 09/09/1998 | CN2290710Y Shaped vaner magnetic oil increasing pump |
| 09/09/1998 | CN2290709Y Strong sealing oil pump |
| 09/02/1998 | CN2289887Y Complex oscillating energy-saving beam-pumping unit |
| 09/02/1998 | CN1191938A Oil well pump for crude oil under well |
| 09/01/1998 | US5800063 Hydraulic oil well pump drive system |
| 08/26/1998 | CN2289076Y Suction pump using motorcycle as power |
| 08/26/1998 | CN2289075Y Balanced arm type two-stage beam-balanced pump |
| 08/26/1998 | CN2289074Y Oil-well pump device |
| 08/25/1998 | US5797452 Double-acting, deep-well fluid extraction pump |
| 08/19/1998 | CN2288293Y Anti-resistance water pump |
| 08/19/1998 | CN2288292Y Full-closed piston-type double-action reciprocating pump |
| 08/19/1998 | CN2288266Y Movable oil pumping vehicle |
| 08/12/1998 | CN2287676Y Double balance chain type oil pump |
| 08/12/1998 | CN2287672Y Power recovery hydraulic well pumping unit for offshore oil production |
| 08/05/1998 | CN2287214Y Water pump |
| 07/29/1998 | CN1188854A Electric machine commutating long stroke beam unit |
| 07/28/1998 | US5785500 Well pump having a plunger in contact with well and pump fluid |
| 07/23/1998 | DE19721823A1 Gravel pump |
| 07/15/1998 | CN2286247Y Stopping automatic slowly reversing antitripping screw oil pump |
| 07/08/1998 | CN2285833Y Hydraulic pumping unit |
| 07/08/1998 | CN2285832Y Four-valve pipe pumping unit |
| 07/08/1998 | CN1186914A Hydraulic oil pumping unit |
| 07/01/1998 | CN2285375Y 双缸抽水机 Twin pumps |
| 07/01/1998 | CN2285374Y Suspension water power type soft sealing rod type pump |
| 07/01/1998 | CN1186171A Rod oil sucking pump |
| 06/30/1998 | US5771968 Cable-based pumping system |
| 06/24/1998 | CN2284867Y Linear motor driven beam-pumping unit |
| 06/23/1998 | CA2154957C Dual action pumping system |
| 06/17/1998 | CN2284301Y Secondary balancing device of beam-pumping unit |
| 06/16/1998 | US5765639 From an oil bearing formation penetrated by a well |
| 06/10/1998 | CN2283741Y Wellhead double-action pressure reducing pumping supporting pump |
| 06/10/1998 | CN2283740Y Small-sized high absorption degree and high pumping water pump |
| 06/10/1998 | CN1184208A Electromagnetic pumping unit |
| 06/06/1998 | CA2192278A1 Deep well submersible pump with upthrust protection |
| 06/03/1998 | CN2283137Y Hydraulic beam-pumping unit |
| 06/03/1998 | CN2283136Y Reciprocating beam-pumping unit |
| 06/03/1998 | CN2283135Y Oil well plunger air extracting pump |
| 06/03/1998 | CN1183828A Vertically reciprocating pump |
| 05/27/1998 | CN2282609Y Improved electromechanical cooperation pumping unit with sucker rod |
| 05/15/1998 | CA2221071A1 Filter for a downhole pump |
| 05/13/1998 | EP0840855A1 Electric pump with a linear motor |
| 05/13/1998 | EP0840835A1 Improvements in deep well pumping apparatus |
| 05/13/1998 | CN2281426Y Wind powered water pump |
| 04/28/1998 | US5743336 Method for installing well tubing and an insert pump in a down-hole well |
| 04/22/1998 | CN2279461Y Antisand oil-well pump |
| 04/22/1998 | CN1179510A Pumping unit |
| 04/15/1998 | CN2278782Y Self-grinding rotary valve oil-well pump |
| 04/15/1998 | CN2278781Y Pipeless well pump putting-into or -out device |
| 04/07/1998 | US5735170 Pumping unit with dynamic fluid ballast |
| 03/31/1998 | US5734209 Linear electric motor and method of using and constructing same |
| 03/18/1998 | CA2215713A1 Pump-packing device for down-hole well arrangements |
| 03/11/1998 | CN1175665A Control device for enhancing anti-interference nature of hydraulic piston-pump |
| 03/04/1998 | CN2275648Y Hand water pump |
| 03/04/1998 | CN2275647Y Rotary blade type electric fan for killing mosquitos |
| 02/25/1998 | CN2275168Y Hand operated water press |
| 02/24/1998 | US5720600 Sucker rod pump |
| 02/18/1998 | EP0823962A1 Vertically reciprocating pump |
| 02/04/1998 | CN2273786Y Multi-function oil pump |
| 01/28/1998 | CN1171494A Vertical reciprocating pumping unit |
| 01/28/1998 | CN1171493A Pumping unit and oil-pumping method |
| 01/21/1998 | CN2272952Y Oil pumping unit |
| 01/14/1998 | CN2272499Y Double-stroke type oil pump |
| 01/13/1998 | US5707221 Method of plural zone pumping utilizing controlled individual pump inlet in each zone |
| 01/07/1998 | CN2272063Y Oil-well pump with rod |
| 01/06/1998 | US5704772 Controller less resilient bladder pump for reduced diameter casing with long cycle |
| 12/31/1997 | WO1997049897A1 Fluid transfer system |
| 12/31/1997 | CN2271622Y Double chain long stroke oil pumping machine |
| 12/29/1997 | EP0660902A4 Submersible well probe sleeve. |
| 12/23/1997 | US5699859 Well water recirculation valve and method of manufacturing thereof |
| 12/17/1997 | CN2270826Y Planetary ring gear type non-beam oil pump |
| 12/17/1997 | CN2270825Y Variable direction device for water outlet of suction pump |
| 12/10/1997 | EP0811748A1 Automatic downhole pump assembly and method for use of the same |
| 12/03/1997 | CN2269482Y High efficiency multifunction high-viscosity oil pumping and sand-control pump without bottom valve |
| 12/03/1997 | CN2269481Y Booster compensator for oil pump |
| 12/03/1997 | CN2269480Y Air pressure self control water pump |
| 11/05/1997 | CN2266657Y Exhauster for removing cooking fumes |
| 10/29/1997 | CN2266047Y Crown sheave type long stroke well pumping unit |
| 10/29/1997 | CN1163353A Highefficiency reciprocating oil pump |
| 10/29/1997 | CN1163352A High efficiency reciprocating oil pump |
| 10/21/1997 | US5678981 Method to control sucker rod pump |
| 10/16/1997 | WO1997038207A1 Pump-off controller |
| 10/15/1997 | CN2264815Y Labour-saving hand self-sucking pump |
| 10/15/1997 | CN2264814Y Hand reciprocating self-sucking pump |
| 10/14/1997 | CA2106658C Drive head for downhole rotary pump |
| 10/09/1997 | WO1997037131A1 Electric pump with a linear motor |
| 10/09/1997 | WO1997037128A1 Sucker rod pump actuating device |
| 10/08/1997 | CN2264264Y 民用抽水井 Civil pumping wells |
| 10/01/1997 | CN2263721Y Machinery automatic electric saver |
| 09/24/1997 | CN2263212Y Stayed submersible electric pump device |
| 09/17/1997 | CN2262616Y Water pump using gasoline engine as power |
| 09/17/1997 | CN1159517A Planetary oil pump |
| 09/10/1997 | CN2262116Y Vacuum control box for oil pump |