| 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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| 02/24/1999 | CN1208821A Sealed compressor having pipe connectors and method of joining pipe connectors to sealed casing |
| 02/24/1999 | CN1208819A Double roll and dry type scroll vacuum pump |
| 02/23/1999 | US5873710 Motor spacer for hermetic motor-compressor |
| 02/16/1999 | US5871342 Variable capacity rolling piston compressor |
| 02/16/1999 | CA2164570C Scroll compressor with flywheel |
| 02/09/1999 | US5868559 Compressor vane spring mechanism |
| 02/03/1999 | EP0894978A1 Double-wrap dry scroll vacuum pump |
| 02/02/1999 | CA2089948C Scroll-type fluid machine |
| 01/26/1999 | US5863191 Scroll compressor having a discharge muffler chamber |
| 01/26/1999 | US5863190 Scroll compressor |
| 01/19/1999 | US5860801 Rotary screw compressor with unloading means |
| 01/14/1999 | WO1999001664A1 Seal structure for casing |
| 01/14/1999 | CA2264149A1 Seal structure for casing |
| 01/13/1999 | EP0890744A2 Scroll compressor |
| 01/07/1999 | EP0889242A1 Liquid ring compressor |
| 01/05/1999 | US5855473 High displacement rate,scroll-type, fluid handling apparatus |
| 12/29/1998 | US5853288 Scroll compressor having a counterboring part communicating with an intermediate pressure chamber |
| 12/29/1998 | US5853287 Scroll compressor having a thrust plate |
| 12/23/1998 | CN1041342C 回转式压缩机 Rotary Compressor |
| 12/09/1998 | EP0882893A2 Scroll fluid displacement machine |
| 12/09/1998 | EP0882892A1 Scroll type machine |
| 12/08/1998 | US5846066 Vacuum pumps with claw-type rotor and roots-type rotor near the outlet |
| 12/08/1998 | US5846065 Scroll compressor with axial biasing |
| 12/08/1998 | US5846062 Two stage screw type vacuum pump with motor in-between the stages |
| 12/02/1998 | EP0881393A1 Hermetic compressor and refrigerating air condioners using it |
| 11/25/1998 | EP0879964A1 Positive displacement pump |
| 11/19/1998 | WO1998037326A3 Compressor system |
| 11/17/1998 | US5836754 Screw fluid machine and screw gear used in the same |
| 11/17/1998 | US5836746 Vacuum pump having lubrication and cooling systems |
| 11/04/1998 | CN1197893A Scroll machine with discharge duct |
| 11/04/1998 | CN1197892A Partition and pilot ring for scroll machine |
| 11/03/1998 | US5829959 Scroll compressor |
| 11/03/1998 | US5829957 Screw fluid machine and screw gear used in the same |
| 10/29/1998 | DE19717455A1 Pump arrangement |
| 10/22/1998 | WO1998046885A1 Vacuum pump system fitted with a liquid mechanical pump |
| 10/21/1998 | EP0872642A1 Scroll machine with discharge duct |
| 10/21/1998 | EP0872641A1 Hermetic scroll compressor |
| 10/21/1998 | CN1196775A Scroll compressor |
| 10/21/1998 | CN1196472A Seal compressor and refrigeration air-condition device using said compressor |
| 10/15/1998 | DE19715480A1 Vakuumpumpsystem mit einer Flüssigringpumpe Vacuum pump system with a liquid ring pump |
| 10/14/1998 | CN1196109A High-pressure dome type compressor |
| 10/13/1998 | US5820354 Cascaded progressing cavity pump system |
| 10/08/1998 | WO1998020259A3 Cascaded progressing cavity pump system |
| 10/06/1998 | US5816782 Multistage positive-displacement vacuum pump |
| 10/06/1998 | US5816297 Vapor control system |
| 09/30/1998 | CN1194337A 压缩机与空气调节器 And air conditioner compressor |
| 09/22/1998 | US5810573 Scroll compressor having a baffle plate and oil passages in the orbiting scroll member |
| 09/22/1998 | US5810572 Scroll compressor having an auxiliary bearing for the crankshaft |
| 09/11/1998 | WO1998039571A1 Installation for compressing a gaseous medium or for creating a vacuum |
| 09/09/1998 | EP0863313A1 Two stage scroll compressor |
| 09/09/1998 | CN1192512A Whirl type air compressor |
| 09/08/1998 | US5803713 Multi-stage liquid ring vacuum pump-compressor |
| 09/03/1998 | DE19711117C1 Anlage zum Verdichten eines gasförmigen Mediums oder zur Erzeugung eines Vakuum System for compressing a gaseous medium or to generate a vacuum |
| 09/01/1998 | US5800150 Hermetic compressor having vibration damping support |
| 09/01/1998 | US5800149 Electrically-driven closed scroll compressor having means for minimizing an overturning moment to an orbiting scroll |
| 09/01/1998 | US5800142 Scroll compressor having a counterboring part communicating with an intermediate pressure chamber |
| 08/27/1998 | WO1998037327A1 Two stage vacuum pumping apparatus |
| 08/27/1998 | WO1998037326A2 Compressor system |
| 08/27/1998 | DE19707222A1 Verdichteranlage Compressor system |
| 08/27/1998 | CA2252755A1 Two stage vacuum pumping apparatus |
| 08/26/1998 | CN1191266A Motor spacer for hermetic motor-compressor |
| 08/19/1998 | EP0858559A1 Scroll compressors |
| 08/18/1998 | US5795136 Encapsulated rotary screw air compressor |
| 08/11/1998 | US5791885 Scroll compressor having positioning means for axially movable non-orbiting scroll |
| 08/05/1998 | EP0856664A1 Two-stage liquid ring pumps |
| 08/05/1998 | CN1039445C Rotar piston compressor and sound abatement of it |
| 08/04/1998 | US5788470 Fluid machine having two spiral working mechanisms with a stepped shape section |
| 07/29/1998 | EP0855511A2 Motor spacer for hermetic motor-compressor |
| 07/28/1998 | US5785149 Screw-type compressor |
| 07/22/1998 | EP0854293A1 Power-variable compressor and air conditioner using the same |
| 07/21/1998 | US5782622 Hermetic compressor having a frame supporting the comprission mechanism |
| 07/21/1998 | US5782618 Rotary compressor having a round cylinder block |
| 07/21/1998 | US5782609 Vacuum pump having different diameter rotors and a drive motor synchronization system |
| 07/15/1998 | CN1187586A Closed compressor and its manufacturing method |
| 07/14/1998 | US5779451 Power efficient multi-stage twin screw pump |
| 07/08/1998 | EP0852323A2 Refrigerant circulating system |
| 07/07/1998 | US5775883 Rolling-piston expander apparatus |
| 07/07/1998 | US5775882 Multicylinder rotary compressor |
| 07/07/1998 | CA2072685C Motor driven fluid compressor within hermetic housing |
| 06/30/1998 | US5772416 Scroll-type machine having lubricant passages |
| 06/30/1998 | US5772411 Gas flow and lubrication of a scroll compressor |
| 06/24/1998 | EP0849471A1 High-pressure dome type compressor in which the discharge of oil by gas is prevented and in which oil is cooled by discharge gas |
| 06/24/1998 | EP0848981A1 Pressure swing adsorption plant to separate oxygen from the air and process to operate the same |
| 06/23/1998 | US5769617 Vane-type compressor exhibiting efficiency improvements and low fabrication cost |
| 06/18/1998 | WO1998025686A1 Pulsator for obtaining oxygen from air, and principle of operation thereof |
| 06/18/1998 | DE19651458A1 Pressure swing adsorption plant for recovery of atmospheric oxygen@ |
| 06/17/1998 | EP0847791A1 Pressure swing adsorption plant to seperate oxygen from the air and process to operate the same |
| 06/10/1998 | EP0846926A2 Refrigerant circulating system |
| 06/10/1998 | EP0846925A2 Refrigerant circulating system |
| 06/10/1998 | EP0846863A1 Scroll compressor |
| 06/10/1998 | EP0846751A2 Refrigerant circulating system |
| 06/09/1998 | US5762526 Electrical terminal connection for a compressor |
| 06/03/1998 | EP0845599A1 Sealing plug device for a refrigerant compressor |
| 06/02/1998 | US5758501 Sliding-blade vapor engine with vortex boiler |
| 05/27/1998 | EP0844300A2 Refrigerant circulating system |
| 05/20/1998 | EP0843096A1 Coupling device for connecting a fuel pump and a vacuum pump having the same casing |
| 05/20/1998 | CN1182175A Oil-free scroll compressor |
| 05/19/1998 | US5752816 Scroll fluid displacement apparatus with improved sealing means |
| 05/14/1998 | WO1998020259A2 Cascaded progressing cavity pump system |
| 05/06/1998 | EP0839258A1 Scroll decompression device for cryogenic temperatures |