| 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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| 05/16/1990 | EP0367845A1 Liquid ring pump |
| 05/15/1990 | US4924839 Rotary blowers |
| 05/10/1990 | DE3935247A1 Liq. ring pump system - has arrangement of short length ballast gas calibration pipe |
| 05/09/1990 | EP0300884B1 Hermetic or semi-hermetic refrigeration motor compressor unit |
| 05/02/1990 | EP0365695A1 Positive displacement twin-shaft vacuum pump |
| 05/01/1990 | US4921406 Mechanical primary vacuum pump including a spring-loaded non-return flap valve |
| 04/28/1990 | CA2001198A1 Rotary compressor of variable displacement type |
| 04/25/1990 | CN1041638A Low pressure container type rotation piston compressor |
| 04/24/1990 | US4919598 Vacuum pumps |
| 04/18/1990 | CN1041428A Fluid compressor |
| 04/18/1990 | CN1041427A Protector for enelosed electric-motored compressor |
| 04/18/1990 | CN1007647B Drive system for orbiting scroll of scroll type fluid compressor |
| 04/18/1990 | CN1007645B Fluid compressor |
| 04/17/1990 | US4917583 Bearing support for a twin-shaft pump |
| 04/17/1990 | US4917582 Horizontal scroll compressor with oil pump |
| 04/17/1990 | US4917581 Mounting boot for a hermetic compressor |
| 04/17/1990 | US4916914 Air conditioning, heat pumps |
| 04/11/1990 | EP0362865A2 Multi-section vacuum pump |
| 04/11/1990 | EP0362757A2 Rotary machine of the screw pump type |
| 04/10/1990 | US4915554 Hermetic rotary compressor with balancing weights |
| 04/10/1990 | US4915514 Rotary machine equipped with a thrust balancing arrangement |
| 04/04/1990 | EP0361421A2 Low pressure container type rolling piston compressor |
| 04/04/1990 | EP0361394A2 Protective device for a hermetic motor-driven compressor |
| 04/04/1990 | CN1041026A Foreign particles trap for compressor |
| 04/04/1990 | CN1007446B Rotary compressor |
| 04/03/1990 | CA1267396A1 Rotor anti-reverse rotation arrangement in a screw compressor |
| 04/03/1990 | CA1267395A1 Rotary compressor relief valve |
| 03/21/1990 | EP0359423A2 Multi-section roots vacuum pump of reverse flow cooling type |
| 03/21/1990 | EP0358926A1 Foreign particle trap for a compressor |
| 03/15/1990 | DE3928870A1 Grease lubrication system for spiral compressor - incorporates ventilation hole which prevents pressure build=up |
| 03/15/1990 | DE3928779A1 Lubricator for bearing of rotor on CAM pin - consists of lubricant tank on end of CAM pin with duct inside guide shaft |
| 03/13/1990 | US4907951 Foreign particle trap for a compressor |
| 02/28/1990 | CN1007000B Dry-type vacuum pump |
| 02/27/1990 | US4904302 Roller in rotary compressor and method for producing the same |
| 02/27/1990 | US4904165 Muffler/check valve assembly for scroll compressor |
| 02/27/1990 | US4903497 Methods and devices for cooling a motor of a refrigerating machine with liquid and economizer gas |
| 02/20/1990 | US4902205 Oil pump for a horizontal type rotary compressor |
| 02/13/1990 | US4900237 Rolling rotor motor balancing means |
| 02/07/1990 | EP0354161A2 Muffler/check valve assembly for scroll compressor |
| 02/06/1990 | US4898521 Oil feeding system for scroll compressor |
| 02/06/1990 | US4898520 Method of and arrangement for reducing bearing loads in scroll compressors |
| 01/23/1990 | US4895496 Refrigeration compressor |
| 01/17/1990 | CN1038860A 致冷压缩机 Refrigeration compressor |
| 01/10/1990 | EP0350426A2 Common compression zone access ports for positive displacement compressor |
| 01/09/1990 | US4893044 Rotor balancing |
| 01/09/1990 | US4892469 Compact scroll-type fluid compressor with swing-link driving means |
| 01/09/1990 | US4892467 Balanced rolling rotor motor compressor |
| 01/04/1990 | DE3921423A1 Compression device having an outer housing with a double weld layer, and method for welding an outer housing and a compression unit |
| 01/03/1990 | EP0348936A2 A scroll gas compressor |
| 01/03/1990 | EP0348417A1 A rotary machine equipped with a thrust balancing arrangement. |
| 01/03/1990 | EP0276252B1 Screw rotor compressor |
| 01/02/1990 | US4890461 Hermetic or semi-hermetic refrigeration motor-compressor unit |
| 12/28/1989 | DE3814368C1 System for supplying oil to a rotary piston compressor cooled by oil injection |
| 12/26/1989 | US4889471 Mechanism for prevention of burning of bearing portions in a hermetic type scroll compressor |
| 12/21/1989 | DE3820585A1 Vacuum pump |
| 12/20/1989 | EP0259333B1 Refrigeration plant and rotary positive displacement machine |
| 12/14/1989 | WO1989012168A1 Liquid ring compressor |
| 12/14/1989 | DE3819692A1 Dry-running slide vane rotary vacuum pump |
| 12/13/1989 | EP0345919A2 Refrigeration compressor |
| 12/12/1989 | US4886437 Bearing arrangement of an external-axial rotary piston blower |
| 12/12/1989 | US4886436 Lubricating arrangement for a shaft seal in a vane type compressor |
| 12/12/1989 | US4886435 Scroll compressor with intermittent oil supply passage |
| 12/12/1989 | US4886427 Hermetic scroll compressor with passage group for discharged fluid |
| 12/12/1989 | US4886424 Multi-piston swash plate type compressor with damping arrangement for discharge reed valves |
| 12/12/1989 | US4886392 Press-fit structure of a shaft |
| 12/06/1989 | EP0344945A2 Supercharger with torsion damping |
| 12/05/1989 | US4884956 Rotary compressor with clearance volumes to offset pulsations |
| 11/29/1989 | EP0343662A2 Rotary displacement compression heat transfer systems incorporating highly fluorinated refrigerant-synthetic oil lubricant compositions |
| 11/28/1989 | US4883414 Rotating piston compressor |
| 11/21/1989 | USRE33116 Single-stage oilless screw compressor system |
| 11/21/1989 | US4881879 Rotary compressor gas routing for muffler system |
| 11/15/1989 | EP0341408A2 Compressor lubrication system with vent |
| 11/09/1989 | DE3913577A1 Auslassventil fuer einen verdichter Exhaust valve for a compressor |
| 11/07/1989 | US4878923 Apparatus for removing oil from a compressed gas flow |
| 11/07/1989 | US4878820 Screw compressor |
| 11/07/1989 | US4878818 Common compression zone access ports for positive displacement compressor |
| 11/02/1989 | WO1989010489A1 Lift valve in a rotary screw machine |
| 11/02/1989 | DE3911123A1 Drive arrangement |
| 11/01/1989 | CN1005642B Process for production of vaccum |
| 10/31/1989 | US4877382 Scroll-type machine with axially compliant mounting |
| 10/31/1989 | US4877381 Compressor shaft collar through port for pressure equalization between fluid pockets |
| 10/25/1989 | EP0338764A2 Vacuum pumps |
| 10/24/1989 | US4875842 Axial flow fluid compressor |
| 10/24/1989 | US4875840 Compressor lubrication system with vent |
| 10/24/1989 | US4875835 Variable displacement compressor |
| 10/24/1989 | US4875454 Supercharging apparatus for an internal combustion engine |
| 10/19/1989 | DE3810505A1 Oil-flooded screw-type compressor for higher pressures |
| 10/18/1989 | CN1005496B Eddy fluid machinery |
| 10/17/1989 | US4874302 Scroll compressor with oil feeding passages in thrust bearing |
| 10/12/1989 | DE3838410A1 Shut-off valve for vacuum pumps |
| 10/12/1989 | DE3809419A1 Innenachsige drehkolbenmaschine Internal-axis rotary piston machine |
| 10/03/1989 | US4871304 Axial flow fluid compresser |
| 09/27/1989 | EP0334646A1 Hysteresis magnet coupling for roots type pumps |
| 09/27/1989 | EP0258255B1 Method of operating an oil-free rotary gas compressor |
| 09/26/1989 | CA1259970A1 Scroll type fluid displacement apparatus with improved anti-wear device |
| 09/20/1989 | EP0332741A1 Multistage vacuum pump |
| 09/19/1989 | US4867657 Scroll compressor with axially balanced shaft |
| 09/19/1989 | US4867652 Balanced rolling rotor motor compressor |
| 09/12/1989 | US4865531 Scroll compressor with super-charging tube |
| 09/12/1989 | US4865530 Scroll-type vacuum apparatus with oil supply to a compression chamber |