| 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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| 12/25/1990 | US4979885 Compressor with sealing means for internal gas and lubricant and having capability of lowering internal gas pressure |
| 12/25/1990 | US4979879 Discharge system for rolling piston rotary compressor |
| 12/19/1990 | EP0403239A2 Capacity controllable compressor apparatus |
| 12/19/1990 | EP0402577A1 Compressor mounting apparatus |
| 12/19/1990 | CN1010872B Lubrication system for compressor |
| 12/18/1990 | US4978287 Horizontal crankshaft rotary compressor with oil drain tube from muffler to interior of shell |
| 12/12/1990 | EP0401399A1 Two-stage or multistage high-vacuum pump |
| 12/12/1990 | EP0401397A1 Liquid-ring compressor |
| 12/06/1990 | DE4016015A1 Sliding vacuum pump for motor vehicle - has flow of lubricating valve controlled by valve actuated by centrifugal force |
| 12/06/1990 | DE4016014A1 Sliding vane vacuum pump - has outlet valve mounted in plane of joint face of rotor housing |
| 12/05/1990 | CA2018032A1 Liquid-ring compressor |
| 12/04/1990 | US4975031 Rotary compressor with compliant impact surfaces |
| 12/04/1990 | US4974318 Method of making a dual-shaft machine |
| 11/27/1990 | US4973232 Rotating scroll machine with oil pump |
| 11/27/1990 | US4973230 Discharge system for hermetic compressor |
| 11/22/1990 | EP0398675A2 Rotor |
| 11/20/1990 | US4971536 Rotor for fluidic apparatus |
| 11/07/1990 | EP0396008A2 Vacuum pump with suction filter |
| 11/07/1990 | EP0395710A1 Valve arrangement for pump or compressor. |
| 11/06/1990 | US4968231 Oil-free rotary compressor with injected water and dissolved borate |
| 11/06/1990 | US4968228 Housing for horizontal rolling piston rotary compressor |
| 11/06/1990 | US4968223 Gas and oil cooling system for a hermetic compressor |
| 11/06/1990 | US4968218 Method of controlling the air output of a screw compressor |
| 10/23/1990 | US4964790 Automatic regulation of balancing pressure in a screw compressor |
| 10/23/1990 | US4964786 Compressor mounting apparatus |
| 10/23/1990 | US4964609 Compressor mounting apparatus |
| 10/17/1990 | EP0392322A1 Supercharger torsion damping mechanism with friction damping |
| 10/17/1990 | EP0392321A1 Torsion damping mechanism for a supercharger |
| 10/17/1990 | EP0392231A2 Controlling device for rotary piston compressor |
| 10/17/1990 | EP0392034A1 Liquid ring pump with a liquid separator integral with the side cover |
| 10/10/1990 | EP0391182A2 Vacuum pump |
| 10/09/1990 | CA1275091A1 Use of perfluoropolyethers in mechanical pumps |
| 10/03/1990 | CN1009852B Lubricating system of sealed compressor with horizontal crankshaft |
| 10/02/1990 | US4960372 Compressor with an isolated vane slot |
| 09/26/1990 | EP0389036A1 Screw compressor and method of operation thereof |
| 09/26/1990 | EP0323979A4 Rotary machine |
| 09/25/1990 | US4958991 Scroll type compressor with discharge through drive shaft |
| 09/25/1990 | US4958990 Motor-compressor with means to reduce noise |
| 09/25/1990 | CA1274495A1 Rotary compressor with vane slot pressure groove |
| 09/25/1990 | CA1274494A1 Rotary compressor lubrication arrangement |
| 09/18/1990 | US4957517 Sound attenuating liquid-gas separator |
| 09/13/1990 | DE4007371A1 Outlet valve for rotary piston compressor |
| 09/12/1990 | EP0387184A1 Horizontal scroll compressor |
| 09/11/1990 | US4955797 Valve indexing for a compressor |
| 09/11/1990 | US4955414 Graphite crystallized in an austenitic cast iron matrix |
| 09/11/1990 | US4955352 Combined supercharger and supercharger coolant pump for an internal combustion engine |
| 09/07/1990 | WO1990010157A1 Scroll fluid machine |
| 09/05/1990 | EP0385915A2 Horizontal scroll compressor |
| 09/05/1990 | CN1045162A Fluid compressor |
| 09/05/1990 | CN1009479B Differential pressure lubrication system for rotary piston compressor |
| 09/04/1990 | US4953517 Torsion damping mechanism for a supercharger |
| 08/28/1990 | US4952122 Fluid compressor |
| 08/28/1990 | CA1273300A1 Distribution system for scroll machine |
| 08/23/1990 | WO1990009523A1 Screw rotor machine comprising a sound silencing device |
| 08/16/1990 | EP0381682A1 Rotary piston compressor. |
| 08/09/1990 | WO1990008901A1 Rotary screw compressor with inlet chamber |
| 08/07/1990 | US4946362 Rotary screw compressor with a lift valve mounted in high pressure end wall |
| 08/07/1990 | US4946361 Horizontal scroll compressor with oil pump |
| 08/07/1990 | US4946353 External stator rolling rotor scroll compressor |
| 08/07/1990 | US4946351 Compressor mounting system |
| 07/31/1990 | US4944663 Rotary compressor having oxidizing and nitriding surface treatment |
| 07/31/1990 | US4944279 Supercharger torsion damping mechanism with friction damping |
| 07/31/1990 | US4944278 Torsion damping mechanism for a supercharger |
| 07/26/1990 | WO1990008261A1 Rotor pair for a high-pressure screw-type compressor |
| 07/24/1990 | US4943217 Delivery valve of a rotary piston compressor |
| 07/24/1990 | US4943216 Sliding-vane rotary compressor |
| 07/24/1990 | US4943215 Multistage vacuum pump with bore for fouling removal |
| 07/17/1990 | US4941810 Sliding-vane rotary compressor |
| 07/11/1990 | CN1008760B Hermetically sealed rotary compressor |
| 07/10/1990 | US4940398 Twin-shaft, multiple-stage vacuum pump with the shafts vertically disposed |
| 07/10/1990 | US4940342 Compressor with a radial bearing for supporting a drive shaft |
| 07/05/1990 | DE3906823A1 Vane vacuum pump |
| 07/04/1990 | EP0376373A1 Screw compressor |
| 07/04/1990 | EP0376049A2 Fluid compressor |
| 07/04/1990 | EP0376026A1 Positive-displacement machine using the spiral principle |
| 06/26/1990 | US4936757 Multi-section vacuum pump |
| 06/26/1990 | US4936756 Hermetic scroll type compressor with refrigerant fluid flow through the drive shaft |
| 06/26/1990 | US4936112 Gas compressors |
| 06/20/1990 | EP0373229A1 Mechanical vacuum pump with a spring loaded return valve |
| 06/19/1990 | USRE33236 Bearing device of sealed type scroll compressor |
| 06/19/1990 | US4934912 Sliding-vane rotary compressor with vibration cushioning members |
| 06/19/1990 | US4934905 Oil turbulence minimizer for a hermetic compressor |
| 06/14/1990 | WO1990006447A1 Cellular blower |
| 06/13/1990 | EP0372480A2 Screw compressor |
| 06/13/1990 | CN1008389B Compressor |
| 06/12/1990 | US4932851 Noise reduction of rotary compressor by proper location of discharge port |
| 06/12/1990 | US4932845 Scroll type compressor with lubrication in suction chamber housing |
| 06/07/1990 | DE3840764A1 Fluegelzellenverdichter Fluegelzellenverdichter |
| 06/06/1990 | CN2057970U Load discharging device of gear pump |
| 06/05/1990 | US4930997 Portable medical suction device |
| 05/31/1990 | WO1990005852A1 Rotary screw compressor with oil drainage |
| 05/30/1990 | EP0370117A1 Two-shaft vacuum pump and method of operation |
| 05/30/1990 | EP0258234B1 Refrigeration system |
| 05/29/1990 | US4929161 Air-cooled oil-free rotary-type compressor |
| 05/29/1990 | US4929160 Scroll compressor having exhausting pipe pressed into muffler chamber under pressure |
| 05/29/1990 | US4929156 Variable capacity compressor |
| 05/23/1990 | DE3839253A1 Positive displacement machine according to the spiral principle |
| 05/23/1990 | DE3839252A1 Positive displacement machine according to the spiral principle |
| 05/22/1990 | US4927342 Compressor noise attenuation using branch type resonator |
| 05/22/1990 | US4927333 Fluid pump |