| 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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| 05/06/1998 | CN1181128A Gas flow and lumbrication of scrool compressor |
| 05/06/1998 | CN1180792A Vortex compressor |
| 05/05/1998 | US5745992 Method of making a scroll-type machine |
| 04/30/1998 | WO1998017895A1 Scroll fluid displacement apparatus with improved sealing means |
| 04/28/1998 | US5743720 Scroll compressor with axial biasing |
| 04/22/1998 | CN1179814A Protection device for high side co-rotating scroll compressor |
| 04/16/1998 | DE19705672A1 Antrieb für eine Vakuumpumpe Drive for a vacuum pump |
| 04/15/1998 | CN1178871A Volumetric liquid machinery |
| 04/07/1998 | USRE35760 Method of making a scroll compressor pump cartridge subassembly |
| 04/07/1998 | US5735678 Scroll compressor having a separate stationary wrap element secured to a frame |
| 04/07/1998 | US5735677 Scroll type fluid machine having recesses on the swivel scroll end plate |
| 04/01/1998 | EP0833058A1 Rotary compressor |
| 04/01/1998 | CN1177682A Vortex type fluid displacement device with abrasion-resistant plate mechanism |
| 03/31/1998 | US5732560 System and method for performing cooling |
| 03/24/1998 | US5730588 Scroll compressor having a fixed scroll plate with groove |
| 03/18/1998 | EP0828940A1 Worm-drive compressor |
| 03/18/1998 | CN1176350A Scroll-type compressor |
| 03/11/1998 | EP0828078A2 Scroll-type compressor |
| 02/26/1998 | WO1998007989A1 Friction vacuum pump |
| 02/25/1998 | CN1174594A Refrigerant compressor |
| 02/19/1998 | DE19632874A1 Reibungsvakuumpumpe Friction vacuum pump |
| 02/11/1998 | EP0746732A4 Refrigeration compressor |
| 02/11/1998 | CN2274275Y Back-driven oil pump |
| 02/04/1998 | EP0822335A2 Scroll compressor |
| 02/04/1998 | CN1172521A Rotary compressor with reduced lubrication sensitivity |
| 02/03/1998 | US5713210 Sliding-blade refrigeration apparatus and method |
| 01/21/1998 | EP0819220A1 Gas flow and lubrication of a scroll compressor |
| 01/20/1998 | US5709537 Evacuating apparatus |
| 01/14/1998 | CN1037022C Scroll-type fluid machine |
| 01/07/1998 | CN1169511A Gear pump for use in electrically-operated sealed compressor |
| 12/31/1997 | WO1997049918A1 Scroll compressor |
| 12/29/1997 | EP0814266A1 Scroll-type fluid displacement apparatus |
| 12/16/1997 | US5697771 Vacuum pump with oil separator |
| 12/10/1997 | EP0811767A1 Gear oil pump for hermetic compressor |
| 12/10/1997 | EP0811766A2 Displacement type vacuum pump |
| 11/26/1997 | EP0808423A1 Rotary compressor with reduced lubrication sensitivity |
| 11/19/1997 | EP0807209A1 Protection device for a high side co-rotating scroll compressor |
| 11/12/1997 | EP0806569A2 Scroll compressor |
| 11/04/1997 | US5683237 Horizontal type scroll compressor having inlet ports at an upper level of the casing |
| 11/04/1997 | US5683229 Hermetically sealed pump for a refrigeration system |
| 10/21/1997 | US5678299 Method for assembling an enclosed motor compressor of a two cylinder type using integral structures |
| 10/08/1997 | CN1161415A Vortex compressor |
| 10/07/1997 | US5674063 Screw fluid machine and screw gear used in the same |
| 10/07/1997 | US5674062 Hermetic compressor with heat shield |
| 10/07/1997 | US5674061 Scroll compression having a discharge muffler chamber |
| 10/07/1997 | US5674051 Positive displacement pump having synchronously rotated non-circular rotors |
| 10/01/1997 | EP0798465A1 Refrigerant compressor |
| 10/01/1997 | EP0798463A2 Oil-free scroll vacuum pump |
| 09/30/1997 | US5672054 Rotary compressor with reduced lubrication sensitivity |
| 09/30/1997 | CA2081411C Motor driven fluid compressor |
| 09/24/1997 | CN1160127A Counterweight drag eliminator |
| 09/17/1997 | EP0795087A1 Housing for a two-stage rotary vane vacuum pump |
| 09/16/1997 | CA2060593C Orbiting scroll member assembly |
| 09/03/1997 | EP0793021A1 Vacuum pumps |
| 09/03/1997 | EP0792434A1 System and method for performing cooling |
| 09/03/1997 | EP0792416A1 Rotary screw compressor with unloading means |
| 08/26/1997 | US5660535 Method of operating a claw-type vacuum pump and a claw-type vacuum pump suitable for carrying out the method |
| 08/19/1997 | CA2081433C Method for assembling motor driven fluid compressor |
| 08/06/1997 | CN1156218A Storage for rotary compressor |
| 08/06/1997 | CN1156217A Sealed compressor |
| 07/22/1997 | US5649816 Hermetic compressor with heat shield |
| 07/02/1997 | CN1153258A Closed compressor |
| 06/25/1997 | CN1152675A Rolling-wheel type expansion machine |
| 06/25/1997 | CN1152673A Fluid machinery |
| 06/12/1997 | WO1997021033A1 Rotary compressor with reduced lubrication sensitivity |
| 06/04/1997 | EP0777051A2 Scroll compressor |
| 06/03/1997 | CA2099988C Two stage gas compressor |
| 05/21/1997 | EP0714482B1 Vacuum pump with oil separator |
| 05/21/1997 | CN1034968C Horizontal rotary compressor |
| 05/20/1997 | US5630712 Electrically-driven closed scroll compressor having means for minimizing an overturning moment to an orbiting scroll |
| 05/20/1997 | CA2045332C Compressor |
| 05/14/1997 | EP0711384B1 Two-stage slide vane vacuum pump |
| 05/14/1997 | EP0663045B1 Method of operating a claw-type vacuum pump, and a claw-type vacuum pump suitable for carrying out the method |
| 05/09/1997 | WO1997016649A1 Scroll compressors |
| 05/09/1997 | WO1997016648A1 Improvements in and relating to single screw compressors |
| 05/09/1997 | WO1997016647A1 Improved compressor arrangement and method of working the same |
| 05/07/1997 | EP0771404A1 Refrigeration system and pump therefor |
| 05/06/1997 | US5626469 Scroll apparatus |
| 05/06/1997 | US5626032 Cyclothermic converter vane pump and impeller system |
| 04/30/1997 | CN1034783C Method for controlling of operation of compressor |
| 04/29/1997 | US5624247 Balance type scroll fluid machine |
| 04/29/1997 | US5624243 Scroll compressor capable of effectively cooling motor thereof |
| 04/24/1997 | WO1997014891A1 Refrigerant compressor |
| 04/24/1997 | CA2207398A1 Refrigerant compressor |
| 04/23/1997 | CN1148141A Multi-cylinder rotary air compressor |
| 04/23/1997 | CN1034689C Horizontal rotative type compressor |
| 04/22/1997 | US5622488 Scroll type fluid machine having first and second frame members to increase air tightness |
| 04/22/1997 | US5622487 Scroll compressor having a separate stationary wrap element secured to a frame |
| 04/09/1997 | CN1147063A Vortex type compressor having non-tracking motion vortex part location device |
| 04/01/1997 | US5616018 Oil supplying apparatus for a horizontal type rotary compressor |
| 04/01/1997 | US5616017 Rotary compressor having a cylinder portion formed of a valve sheet |
| 04/01/1997 | US5616015 High displacement rate, scroll-type, fluid handling apparatus |
| 03/25/1997 | US5613843 Package-type screw compressor |
| 03/25/1997 | US5613841 Capacity modulated scroll machine |
| 03/25/1997 | US5613368 Refrigeration apparatus and methods |
| 03/13/1997 | WO1997009534A1 High-pressure dome type compressor |
| 03/12/1997 | EP0761974A1 Screw-type compressor |
| 03/12/1997 | CN1144885A Scroll compressor |
| 02/20/1997 | DE4143555C2 Compressor with built-in electric motor |
| 02/19/1997 | EP0758432A1 Vapor control system |