| Patents for F04C 29 - Component parts, details, or accessories, of pumps or pumping installations specially adapted for elastic fluids, not provided for in groups (16,981) |
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| 01/08/1992 | EP0464316A1 Screw compressor |
| 01/08/1992 | EP0464315A1 Oil-flooded screw compressor |
| 01/08/1992 | EP0464282A2 Scroll compressor discharge valve |
| 01/07/1992 | US5078583 Inlet port opening for a roots-type blower |
| 12/31/1991 | US5076772 Slider block radial compliance mechanism with integral deflection bearing |
| 12/31/1991 | US5076771 Scroll type fluid compressor with lubricated spiral seal member |
| 12/31/1991 | US5076768 Rotary piston compressor |
| 12/31/1991 | US5076067 Compressor with liquid injection |
| 12/25/1991 | CN1015194B Low pressure container type rotation piston compressor |
| 12/17/1991 | US5073093 Scroll-type fluid handling machine |
| 12/17/1991 | US5073089 Liquid-ring compressor |
| 12/11/1991 | EP0460578A1 Screw fluid machine |
| 12/10/1991 | US5071328 Double rotor compressor with two stage inlets |
| 12/05/1991 | DE4116851A1 Eccentric drive for spiral displacement supercharger - has elastic equalising bed with projecting bearing element |
| 12/05/1991 | DE4116827A1 Elastic bearing bed assembly - is used in eccentric drive for spiral supercharger |
| 12/04/1991 | EP0459778A1 Slidable part, refrigerant compressor provided therewith |
| 12/04/1991 | EP0459116A1 Silent vacuum pump |
| 12/04/1991 | EP0459112A1 Rotary vane vacuum pump |
| 12/04/1991 | EP0459107A1 Vacuum vane pump and its method of oil supply |
| 12/04/1991 | EP0458891A1 Screw rotor machine comprising a sound silencing device. |
| 12/04/1991 | EP0381682B1 Rotary piston compressor |
| 12/03/1991 | US5069607 Rotary rolling piston type compressor |
| 12/03/1991 | US5069605 Scroll fluid machine having a sealing member radially inwardly of a thrust bearing |
| 12/03/1991 | CA1292729C Multi-section roots vacuum pump of reverse flow cooling type with internal flow division arrangement |
| 11/28/1991 | DE4116747A1 Vane cell compressor - has two outlet channels in one of two side parts and several grooves in rotor outer peripheral surface to support outflow |
| 11/27/1991 | EP0458135A1 Roots-type blower with improved inlet |
| 11/27/1991 | EP0458134A1 Inlet port opening for a Roots-type blower |
| 11/26/1991 | US5067878 Discharge flow blocking valve for a hermetic rotary compressor |
| 11/21/1991 | EP0457603A1 A scroll type fluid displacement apparatus |
| 11/21/1991 | EP0457491A1 Gerotor pumps |
| 11/21/1991 | EP0456688A1 Rotary screw compressor with inlet chamber. |
| 11/20/1991 | CN2089082U Totally enclosed rolling rotor type compressor |
| 11/19/1991 | US5066202 Method and apparatus for delivering oil to a multi-stage pump |
| 11/14/1991 | WO1991017360A1 Scroll compressor |
| 11/14/1991 | WO1991017345A1 Rotary screw compressor with thrust balancing means |
| 11/12/1991 | US5064356 Counterweight shield for refrigeration compressor |
| 11/05/1991 | US5062779 Outlet valve for a rolling piston rotary compressor |
| 10/31/1991 | WO1991016543A1 Scroll compressor |
| 10/30/1991 | CN1055800A 真空泵 Vacuum pump |
| 10/29/1991 | US5060759 Compressor oil supply system |
| 10/23/1991 | EP0452896A1 Lubrication for scroll compressor |
| 10/22/1991 | CA1291094C Compressor unit for the production of compressed air |
| 10/18/1991 | CA2040721A1 Hermetically sealed scroll type refrigerant compressor with an improved lubricating mechanism |
| 10/16/1991 | EP0451708A2 Vacuum pump |
| 10/16/1991 | CN1014344B Foreign particles trap for compressor |
| 10/15/1991 | US5056995 Displacement compressor with reduced compressor noise |
| 10/09/1991 | EP0450847A1 Refrigerant compressor |
| 10/09/1991 | CN1014256B Fluid compressor |
| 10/08/1991 | US5055010 Suction baffle for refrigeration compressor |
| 10/02/1991 | EP0448750A1 Multistage dry compressing vacuum pump and method for its operation |
| 10/01/1991 | US5052901 Lift valve in a rotary screw machine |
| 09/25/1991 | EP0447716A1 Two-stage pumping system |
| 09/24/1991 | US5052041 Silencer |
| 09/24/1991 | US5051077 Screw compressor |
| 09/24/1991 | US5051076 Two-cylinder-type rotary compressor system having improved suction pipe coupling structure |
| 09/24/1991 | US5051072 Gas removable pump for liquid |
| 09/19/1991 | DE4008268A1 Rotary piston compressor with selective cylinder loading - has load chamber for each cylinder in four-cylinder engine with output thrust additionally enhanced by varying transmission |
| 09/17/1991 | US5050233 Rotary compressor |
| 09/17/1991 | US5049050 Method for operating a twin shaft vacuum pump according to the Northey principle and a twin shaft vacuum pump suitable for the implementation of the method |
| 09/17/1991 | US5049041 Lubricating oil supply device for van compressors |
| 09/10/1991 | US5046935 Compressor with reduced vibrations |
| 09/10/1991 | US5046934 Twin shaft vacuum pump with purge gas inlet |
| 09/10/1991 | US5046932 Rotary epitrochoidal compressor |
| 09/04/1991 | EP0444221A1 Vertical rotary compressor |
| 09/04/1991 | CN1013793B Protector for enclosed electric-motored compressor |
| 09/03/1991 | US5044909 Valve device for control of the inner volume relation in a screw type rotary compressor |
| 09/03/1991 | US5044907 Rotor device having inner rotor and driven outer rotor |
| 09/03/1991 | US5044895 Oil supply device for a rotary machine |
| 08/27/1991 | US5043617 Multi-motor liquid sample and device |
| 08/20/1991 | US5040958 Scroll compressor having changeable axis in eccentric drive |
| 08/20/1991 | US5040956 Magnetically actuated seal for scroll compressor |
| 08/20/1991 | US5040952 Scroll-type compressor |
| 08/07/1991 | EP0439672A1 Vacuum supply installation |
| 08/06/1991 | US5037282 Rotary screw compressor with oil drainage |
| 08/06/1991 | US5037278 Scroll compressor with heat insulating and soundproof cover in bottom disposed low pressure chamber |
| 08/01/1991 | DE4002771A1 Vehicle vacuum brake booster connected to carburettor - has rotary vane exhaust cutting in when vacuum is insufficient |
| 07/31/1991 | CN1053477A 旋转压缩机 Rotary compressor |
| 07/30/1991 | USRE33652 Electrically driven compressor with a peripheral housing weld |
| 07/30/1991 | US5035590 Double-shaft vacuum pump with synchronization gears |
| 07/30/1991 | US5035050 Method of installing a valve assembly in a compressor |
| 07/24/1991 | EP0437637A1 Liquid ring pump |
| 07/23/1991 | US5033944 Lubricant circuit for a compressor unit and process of circulating lubricant |
| 07/18/1991 | DE4100328A1 Bearing arrangement for spiral compressor - is designed to prevent bearing overload by careful arrangement of bearing centres |
| 07/10/1991 | EP0436331A1 Dual flow single cell rotary compressor |
| 07/10/1991 | EP0436330A1 Dual flow single cell rotary compressor |
| 07/09/1991 | US5030073 Rotary compressor |
| 07/03/1991 | CN1013048B Compressor with radial bearing for supporting drive shaft |
| 07/03/1991 | CA2032787A1 Dual flow single cell rotary compressor |
| 07/03/1991 | CA2030063A1 Dual flow single cell rotary compressor |
| 07/02/1991 | US5028222 Fluid compressor with axial thrust balancing |
| 07/02/1991 | US5028220 Cooling and lubrication system for a vacuum pump |
| 06/26/1991 | EP0434597A1 Magnetically actuated seal for scroll compressor |
| 06/26/1991 | CN2079673U Rotor type compressor with silencer structure |
| 06/25/1991 | US5026262 Multipiece eccentric shaft |
| 06/19/1991 | EP0433212A1 Slotted rotor lubrication system |
| 06/18/1991 | US5024588 Rotary compressor and process of compressing compressible fluids with intake and discharge through piston shaft and piston |
| 06/13/1991 | WO1991008378A1 Device for preventing axial vibrations in a rotary screw compressor |
| 06/12/1991 | EP0432085A2 Protection for electrically driven device |
| 06/12/1991 | EP0432084A1 Scroll compressor with unitary crankshaft, upper bearing and counterweight |
| 06/11/1991 | US5022835 Hermetic compressor with crankshaft having eccentric piston portion with hydrodynamic wedge |