| 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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| 12/01/1992 | WO1992021881A1 Rotary compressor |
| 11/11/1992 | CN2121553U Energy-saving oil suction machine |
| 11/11/1992 | CN2121552U Liquid balance beam suction machine |
| 11/10/1992 | US5161956 Valve pump |
| 11/04/1992 | CN2120898U Long stroke beam-pumping unit |
| 10/31/1992 | CA2041564A1 I.v.s. pump |
| 10/28/1992 | CN2120201U Compact oil pumping unit |
| 10/28/1992 | CN1065618A Pipe type oil pump batch repairing method |
| 10/21/1992 | CN2119519U Steam injection column oil pump |
| 10/21/1992 | CN2119518U Anti-reverse screw pump driver |
| 10/14/1992 | CN2118839U Plunger type hydraulic beam-pumping unit |
| 10/14/1992 | CN2118838U Adjustor of beam-pumping unit |
| 10/14/1992 | CN2118837U Gravity balance chain oil-pumping unit |
| 10/13/1992 | CA2040324A1 Downhole reciprocating pump and components therefor |
| 10/01/1992 | DE4110022A1 Double-acting cylinder piston stirring mechanism pump - is controllable via seat valve rings and has lever-type stirring mechanism for mixing aspirating and pressing |
| 09/23/1992 | CN1064733A Permanent-magnet waxproof oil pump |
| 09/16/1992 | CN1018279B Hanging reinforced extracting oil pump |
| 09/15/1992 | US5147185 Pump apparatus for fluid sampling and collection, and the like |
| 09/15/1992 | US5147182 Integrated vacuum pressure system for a bladder pump |
| 09/08/1992 | US5145332 Well pumping |
| 09/03/1992 | WO1992014929A1 Pump apparatus for fluid sampling and collection, and the like |
| 08/27/1992 | DE4135491A1 Pressure shock damper for pipes in bore hole - uses air chamber above submerged pump |
| 08/25/1992 | US5141411 Center-anchored, rod actuated pump |
| 08/19/1992 | CN2113360U Tensile single cylinder group hydraulic oil pumping unit |
| 08/19/1992 | CN2113359U Pressure regenerating type oil pump for thick oil |
| 07/23/1992 | WO1992012346A1 Pumps |
| 07/21/1992 | US5131466 Self actuated intake valve assembly for inlet subsurface reciprocating pumps |
| 07/08/1992 | CN1062583A Low-speed drive system with stepless speed regulation for beam oil-pumping unit |
| 07/07/1992 | US5127803 Pump tool |
| 06/17/1992 | EP0490773A1 Multistage pump especially intended for pumping a multiphase fluid |
| 06/17/1992 | CN2107544U Oil pump |
| 06/04/1992 | DE4037899A1 Cleaning device for well shaft - includes perforated or slotted well tube with sealed treatment chamber and pressure pump |
| 06/03/1992 | CN2106245U Oil pump piston |
| 05/12/1992 | US5112140 Seal assembly for reciprocating members |
| 05/08/1992 | CA2039943A1 Sucker rod actuated intake valve assembly for insert subsurface reciprocating pumps |
| 04/29/1992 | CN2103032U Automatic hydraulic beam-pumping unit |
| 04/28/1992 | US5108272 Sucker rod pump |
| 04/22/1992 | CN2102385U Stirring heat thick oil pump |
| 04/21/1992 | US5105671 Well pumping unit with adjustable balance beam |
| 04/21/1992 | CA1299018C Beamless pumping unit |
| 04/16/1992 | DE4128252A1 Intake valve for insert subsurface reciprocating pump |
| 04/14/1992 | US5104296 Engine end for a downhole hydraulically actuated pump assembly |
| 04/07/1992 | US5101676 Attachment for sucker rod depth adjustment |
| 04/01/1992 | CN2100510U Bidirectional intake thick oil pump |
| 04/01/1992 | CN1059958A Deep well pump with crankshaft |
| 03/17/1992 | US5095976 Tubing sand pump |
| 03/04/1992 | CN1015728B Two-stage balance bar beam-punping unit |
| 02/27/1992 | DE4026509A1 Borehole piston pump drive rod subjected only to tensile loads - is made from high tensile plastic material and only subjected to tensile load |
| 02/19/1992 | CN2096657U Long-life regeneratable ceramics liner oil-well pump |
| 02/11/1992 | CA1295511C Apparatus for transferring fluid medium |
| 01/20/1992 | CA2021595A1 Downhole reciprocating pump |
| 01/15/1992 | EP0466187A1 Pump mounting structure of canned submersible motor for deep well pump |
| 01/15/1992 | CN1057887A Petroleum rodless pump for super deep well |
| 01/08/1992 | CN2092615U Oil extracting rod contrifugal pumps |
| 12/03/1991 | US5069602 Fluid-powered subsurface pump |
| 12/01/1991 | CA2018119A1 Method for controlling the speed of a pump jack |
| 11/13/1991 | EP0455696A1 Positive-displacement pump. |
| 11/13/1991 | CN2088611U Deep blasting hole water drainage device |
| 11/12/1991 | US5064355 Multiple engine deep well pump |
| 11/05/1991 | US5062480 Self actuated intake valve assembly for insert subsurface reciprocating pumps |
| 10/22/1991 | US5058669 Extraction system with a pump having an elastic rebound inner tube |
| 10/22/1991 | US5058667 Reciprocating water well pump |
| 10/22/1991 | US5058454 Polished rod spacer system |
| 10/16/1991 | CN2086809U High-efficiency and energy-saving oil-pumping unit |
| 10/13/1991 | CA2039856A1 Well pumping systems |
| 10/09/1991 | CN2086326U Screw arbor beam pump gearing |
| 10/09/1991 | CN1014265B Undersea conveying apparatus of crude oil and natural gas |
| 09/19/1991 | WO1991014114A1 Improved oil well pumping mechanism |
| 09/17/1991 | US5049046 Pump control system for a downhole motor-pump assembly and method of using same |
| 09/17/1991 | US5048604 Sucker rod actuated intake valve assembly for insert subsurface reciprocating pumps |
| 09/17/1991 | CA1289062C Pressure-operated valving for oil and gas well swabs |
| 08/27/1991 | US5042149 Method of assembling a well pump |
| 08/20/1991 | US5040608 Anchorable pack-off assembly and method of seating the same |
| 07/16/1991 | US5031402 Pneumatic pump actuator for oil wells |
| 07/16/1991 | CA1286152C Pumping unit |
| 07/02/1991 | US5027902 Self-cycling pump apparatus and method |
| 07/02/1991 | US5027666 Compact counter balanced pump jack |
| 06/30/1991 | CA2030127A1 Compact counter balanced pump jack |
| 05/28/1991 | US5018581 Sand release apparatus and method |
| 05/28/1991 | US5018350 Long stroke deep well pumping unit |
| 05/22/1991 | CN2077495U Double-cavity balanced deep-well pump |
| 05/22/1991 | CN2077494U Energy-saving beam-pumping unit with gravit balance |
| 05/22/1991 | CN1051611A Hanging reinforced extracting oil pump |
| 05/15/1991 | CN2077046U 液压振动泵 Hydraulic pump vibration |
| 05/14/1991 | US5015151 Motor controller for electrical submersible pumps |
| 05/08/1991 | CN2076616U Crankshaft type deep-well pump |
| 05/07/1991 | US5013218 Submersible pneumatic pump for water table |
| 05/01/1991 | CN2076173U Gear type motor-driven submersible pump |
| 04/04/1991 | DE4030319A1 Fibre-reinforced structures with couplings - comprise reinforced structure, pref. of fibre-reinforced polyphenylene sulphide with enlarged end which forms connection to coupling |
| 04/02/1991 | US5004405 Pneumatically powered submersible fluids pump with integrated controls |
| 03/20/1991 | CN2073492U Balance wheel rocking rod type beam-pumping unit |
| 03/20/1991 | CN2073491U Thick oil pump of improved gas injecting channel |
| 03/13/1991 | CN2073041U Wantonly combined branch oiling apparatus of oiling pump |
| 03/06/1991 | CN1049704A Symmetric oil-pumping machine |
| 03/05/1991 | US4997346 Well pumping systems |
| 03/05/1991 | CA1280935C Vaned slinger for pumps |
| 03/05/1991 | CA1280934C Well pumping unit |
| 02/20/1991 | CN2071716U Hose coupling |
| 02/13/1991 | CN2071266U Immersed thick oil pump |
| 01/30/1991 | CN2070370U Wear-resistant corrosion-resistant ceramic push oil pump |