| Patents for F04C 23 - Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids (6,201) |
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| 07/05/1989 | CN1004721B Two-cylinder type rotary compressor |
| 07/04/1989 | US4844044 Torsion damping mechanism for a supercharger |
| 06/13/1989 | US4838772 Cartridge rotary vane pump |
| 06/06/1989 | US4836758 Scroll compressor with canted drive busing surface |
| 05/31/1989 | CN1033223A Rotor balancing |
| 05/24/1989 | EP0317270A2 Scroll compressor |
| 05/24/1989 | EP0317056A1 Rotor balancing |
| 05/17/1989 | EP0315721A1 Internal combustion driven air compressor |
| 05/16/1989 | US4830582 Rotary type compressing apparatus employing exhaust gas control valve |
| 05/02/1989 | US4826408 Two-cylinder rotary compressor and method for manufacturing the same |
| 04/25/1989 | US4824344 Scroll-type compressor with oil passageway in thrust bearing |
| 04/04/1989 | US4818195 Scroll compressor with valved port for each compression chamber |
| 03/28/1989 | US4815951 Scroll compressor with super-charging tube |
| 03/22/1989 | EP0308119A2 Hermetic scroll type compressor |
| 03/14/1989 | US4811471 Method of assembling scroll compressors |
| 03/08/1989 | EP0305717A2 Supercharging unit |
| 02/07/1989 | US4802827 Compressor |
| 01/11/1989 | EP0298949A2 Combined fluidizing and vacuum pump |
| 01/10/1989 | US4797071 Motor and vane-pump assembly free from external oil leaks |
| 01/10/1989 | US4797068 Vacuum evacuation system |
| 01/03/1989 | US4795315 Two-stage liquid ring pump |
| 12/28/1988 | CN87104104A Rotary positive displacemet machine for compressible working fluid |
| 12/27/1988 | US4793779 Rotating piston compressor having an axially adjustable rotary sleeve valve |
| 12/13/1988 | CA1246509A1 Main bearing for a rotary compressor |
| 12/13/1988 | CA1246508A1 Suction tube seal for a rotary compressor |
| 12/06/1988 | US4789314 Multi-section roots vacuum pump of reverse flow cooling type with internal flow division arrangement |
| 11/24/1988 | DE3814931A1 Machine arrangement |
| 11/17/1988 | EP0290662A1 Positive-displacement two-shaft vacuum pump |
| 10/26/1988 | CN87209141U Compression engine with rotation balance |
| 10/25/1988 | US4780067 Multicylinder rotary compressor |
| 10/20/1988 | DE3805346A1 Vane-cell pump |
| 10/20/1988 | DE3710782A1 Method and device for pumping out vapours and/or vaporous mixtures and/or gas-vapour mixtures or similar media |
| 10/11/1988 | US4776758 Combined fluidizing and vacuum pump |
| 10/05/1988 | CN88102057A Scroll type compressor |
| 09/28/1988 | CN88101361A 涡旋式压缩机 Scroll compressor |
| 09/21/1988 | EP0283045A2 Scroll type compressor |
| 09/20/1988 | US4772185 Rotary vane pump having a plurality of inlet and outlet slots in a rotating sleeve |
| 09/13/1988 | US4770609 Two-stage vacuum pump apparatus and method of operating the same |
| 09/06/1988 | US4768936 Scroll compressor with oil pickup tube in oil sump |
| 08/30/1988 | US4767293 Scroll-type machine with axially compliant mounting |
| 08/30/1988 | US4767284 Screw vacuum pump unit |
| 08/24/1988 | EP0279646A2 Scroll compressor |
| 08/16/1988 | US4764097 Two-cylinder type rotary compressor |
| 08/09/1988 | US4762478 Scroll compressor with balancer mounted in single frame |
| 08/09/1988 | US4762471 Rotary compressor for refrigerant |
| 08/02/1988 | US4761166 Compressor system |
| 07/21/1988 | DE3448123C2 Precipitator, in particular for liquid-ring vacuum pumps or the like |
| 07/19/1988 | US4758132 Rotary machine with motor embedded in the rotor |
| 07/13/1988 | EP0274272A2 Two stage liquid ring pump |
| 07/12/1988 | US4756675 Scroll type fluid transferring machine with separate motor driving each scroll |
| 07/07/1988 | DE3730583A1 Rotary-vane vacuum pump |
| 06/29/1988 | EP0272767A2 Multi-section roots vacuum pump of reverse flow cooling type with internal flow division arrangement |
| 06/15/1988 | EP0270741A1 Compressor with improved exposed outboard thrust plate and method of assembly |
| 06/01/1988 | DE3639512A1 Vacuum pump system with a Roots pump |
| 05/24/1988 | US4746277 Rotary compressor with pressure pulse suppression |
| 05/17/1988 | US4744737 Electrically driven compressor with a peripheral housing weld |
| 05/10/1988 | US4743182 Rotating piston compressor with thin-walled radially-resilient piston |
| 05/10/1988 | US4743181 For an air conditioning machine |
| 05/10/1988 | US4743177 Enclosed type compressor and method for assembling the same |
| 05/03/1988 | US4741677 Electrical compressor for motor vehicle horns, comprising an electric motor and air compressor in mutual axial alignment relationship |
| 03/29/1988 | US4734020 Scroll type compressor with spiral oil feeding grooves in thrust bearing |
| 03/15/1988 | US4730997 Hermetic scroll compressor having concave spaces communicating with a delivery port |
| 03/15/1988 | US4730994 Compressor with improved exposed outboard thrust plate and method of assembly |
| 03/15/1988 | US4730375 Method for the assembly of a scroll-type apparatus |
| 03/01/1988 | US4728266 Motor drive vacuum pump |
| 02/25/1988 | DE3727986A1 Compacting machine compressing fluid e.g. refrigeration compressor |
| 02/24/1988 | EP0256234A2 Vacuum generating system |
| 02/23/1988 | US4726739 Multiple cylinder rotary compressor |
| 02/23/1988 | CA1233144A1 Controlled suction unloading in a scroll compressor |
| 02/17/1988 | CN87105288A Rotary type compressor using exhaust regulating valve |
| 12/29/1987 | US4715796 Scroll-type fluid transferring machine with loose drive fit in crank shaft recess |
| 12/22/1987 | US4714414 Plural-stage gas compressor |
| 12/16/1987 | CN87103954A Compressor |
| 12/16/1987 | CN87103613A Hermetically sealed rotary compressor |
| 12/01/1987 | US4710111 Rotary compressor with oil groove between journal and journal bearing |
| 11/24/1987 | US4708607 Scroll compressor with lower and higher pressure chambers acting on the orbiting end plate |
| 10/27/1987 | US4702683 Motor driven scroll-type machine with an eccentric bushing structure for enhancing lubrication |
| 10/27/1987 | US4702682 Motor driven scroll-type machine with compact oil lubricating structure |
| 10/27/1987 | US4702681 Motor driven scroll-type machine with cooling and lubricating structure |
| 10/14/1987 | EP0240823A2 Rolling piston compressor |
| 10/08/1987 | DE3610861A1 Compressor with free-piston engine drive |
| 10/06/1987 | US4697994 Multistage discharge type rotary vacuum pump |
| 09/29/1987 | US4696629 Hermetic scroll compressor with welded casing section |
| 09/29/1987 | US4696628 Scroll-type fluid transferring machine with intake port and second intake passage |
| 09/29/1987 | US4696627 Scroll compressor |
| 09/29/1987 | US4696626 Railroad car air compressor unit |
| 09/23/1987 | EP0237734A2 Screw vacuum pump unit |
| 09/23/1987 | EP0237618A2 Rotary vane vacuum pump |
| 09/08/1987 | US4692101 Liquid ring vacuum pump arrangement having minimized operating liquid consumption |
| 08/13/1987 | DE3604206A1 Dry-running slide vane rotary vacuum pump |
| 08/13/1987 | DE3603809A1 Two-step slide vane rotary vacuum pump |
| 08/11/1987 | US4685865 Liquid ring compressor having openings in housing for emptying liquid during stoppage |
| 08/05/1987 | EP0230868A2 A rotary machine |
| 08/04/1987 | US4684330 Drive for rotary compressor |
| 07/08/1987 | EP0227881A1 Rotary compressor with vane slot pressure groove |
| 07/08/1987 | EP0227880A1 Compressor with an exposed outboard thrust plate |
| 06/30/1987 | US4676075 Scroll-type compressor for helium gas |
| 06/25/1987 | DE3639944A1 Standardised unit |
| 06/23/1987 | US4674960 Sealed rotary compressor |
| 06/16/1987 | US4673339 Scroll compressor with suction port in stationary end plate |