| Patents for F04C 18 - Rotary-piston pumps specially adapted for elastic fluids (19,462) |
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| 03/26/1991 | US5002472 Profiles of screw-type rotors for rotary machines conveying a gaseous fluid |
| 03/26/1991 | US5002470 Internal stator rolling rotor motor driven scroll compressor |
| 03/26/1991 | CA2026052A1 Rotary vane compressor |
| 03/26/1991 | CA1281891C Method of manufacturing rotor for rotary fluid pumps |
| 03/14/1991 | DE3930560A1 Vehicle engine supercharger - is roller-piston machine with eccentric shaft connected to slide |
| 03/13/1991 | EP0416224A2 Fluid compressor |
| 03/13/1991 | CN1012003B Intermittent service screw compressor |
| 03/13/1991 | CN1012002B Threaded bolt compression (or expansion) machine using joggle-joint-set |
| 03/12/1991 | US4998864 Scroll machine with reverse rotation protection |
| 03/05/1991 | US4997352 Rotary fluid compressor having a spiral blade with an enlarging section |
| 03/05/1991 | US4997348 Spiral rotary piston displacement machine with advanced inlet sealing line |
| 02/27/1991 | EP0413728A1 Lift valve in a rotary screw machine |
| 02/26/1991 | US4995796 Multi-section roots vacuum pump of reverse flow cooling type |
| 02/26/1991 | US4995789 Enclosed type electric compressor |
| 02/20/1991 | CN1011728B Screw rotor compressor and refrigeration plant |
| 02/19/1991 | US4993930 Vacuum pump apparatus and shaft sealing device therefor |
| 02/19/1991 | US4993929 Scroll machine with lubricated thrust surfaces |
| 02/19/1991 | US4993928 Scroll compressor with dual pocket axial compliance |
| 02/19/1991 | US4993927 Scroll fluid machine with lubrication of oldham coupling |
| 02/19/1991 | US4993923 Rotary compressor with capacity regulation valve |
| 02/13/1991 | EP0412369A1 Supercharging apparatus for internal combustion engine |
| 02/12/1991 | US4992033 Scroll-type machine having compact Oldham coupling |
| 02/12/1991 | US4992032 Scroll compressor with dual pocket axial compliance |
| 02/06/1991 | EP0411000A1 A method for manufacturing screw rotors. |
| 02/06/1991 | CN2070834U Miniature air pump for air horn |
| 02/05/1991 | US4990073 Two-cylinder rotary compressor having improved valve cover structure |
| 02/05/1991 | US4990072 Rotating helical charger with axially movable displacement disk |
| 02/05/1991 | US4990071 Scroll type fluid apparatus having two orbiting end plates linked together |
| 02/05/1991 | US4990069 Multi-stage roots vacuum pump with sealing module |
| 02/05/1991 | US4989997 Radial load reducing device, and sliding bearing and screw compressor using the device |
| 02/05/1991 | US4989414 Capacity-controllable air conditioner |
| 02/05/1991 | CA1279854C Scroll type fluid compressor with axial clearance adjusting construction |
| 01/31/1991 | DE3925202A1 Bevel gear pump with coupled axles - has transmission linkage for ensuring synchronisation of two cooperating bevel gear wheels |
| 01/30/1991 | EP0410074A2 Radial load reducing device, and sliding bearing and screw compressor using the device |
| 01/29/1991 | CA1279621C Rotary compressor |
| 01/29/1991 | CA1279620C High compression scroll element for scroll-type machines |
| 01/23/1991 | CN2069937U Oilless vacuum pump with offset grooved rotor and vanes |
| 01/22/1991 | US4986741 Vane compressor with ball valve located at the end of vane biasing conduit |
| 01/22/1991 | CA1279302C Rotary type fluid machine |
| 01/22/1991 | CA1279301C Rotary type fluid machine |
| 01/17/1991 | DE4020082A1 Vane cell vacuum pump for servo pump for servo drives - makes use of sintered rotor built up in layers |
| 01/17/1991 | DE4019854A1 Vane cell vacuum pump for servo drive - use of kidney-shaped hole as outlet channel |
| 01/15/1991 | CA1279047C Lubricating mechanism for a scroll-type fluid displacement apparatus |
| 01/09/1991 | EP0406800A2 Vane vacuum pump with dosing device |
| 01/09/1991 | CN1048438A Rotary positive displacement compressor and refrigeration plant |
| 01/09/1991 | CN1048437A Fluid compressor |
| 01/08/1991 | US4983107 Multistage rotary piston vacuum pump having sleeves to fix shaft positions |
| 01/08/1991 | CA1278782C Axial thrust load mechanism for a scroll type fluid displacement apparatus |
| 01/03/1991 | DE4020764A1 Hermetically sealed rotary compressor - has axial gap for lubrication oil between piston and cylinder wall |
| 01/02/1991 | EP0405224A2 Fluid compressor |
| 01/02/1991 | EP0404921A1 Rotor pair for a high-pressure screw-type compressor. |
| 01/01/1991 | US4981424 High pressure single screw compressors |
| 12/27/1990 | EP0404512A2 Scroll type fluid displacement apparatus |
| 12/27/1990 | EP0323476B1 Rotor for a rotary screw machine |
| 12/25/1990 | US4979885 Compressor with sealing means for internal gas and lubricant and having capability of lowering internal gas pressure |
| 12/12/1990 | EP0401968A2 A rotary compressor |
| 12/12/1990 | EP0401741A1 Two stage primary dry pump |
| 12/12/1990 | EP0401380A1 Rotary displacement compressor |
| 12/11/1990 | US4976592 Variable capacity vane compressor |
| 12/06/1990 | DE3917651A1 Sliding vane pump for gaseous medium - has constant vol. in chambers unconnected to inlet or outlet |
| 12/05/1990 | EP0400951A1 Axial sealing mechanism for a scroll type compressor |
| 12/04/1990 | US4975032 Roots type blower having reduced gap between rotors for increasing efficiency |
| 12/04/1990 | US4974427 In a refrigeration system |
| 12/04/1990 | US4974318 Method of making a dual-shaft machine |
| 12/04/1990 | CA1277297C Rotary compressor |
| 11/29/1990 | DE3916869A1 Rotary slide high speed air pump - has housing which encloses cylindrical inner chamber with smooth face surfaces and eccentrically mounted circular cylindrical rotor |
| 11/29/1990 | DE3916858A1 Internal axis rotary piston machine - has provision of low friction coating on rotor or housing |
| 11/27/1990 | US4973232 Rotating scroll machine with oil pump |
| 11/21/1990 | CN1047133A Lift valve in rotary screw machine |
| 11/20/1990 | US4971536 Rotor for fluidic apparatus |
| 11/07/1990 | CN1010339B Axial sliding-vane type compressor |
| 11/07/1990 | CN1010338B Screw compressor rotor with through slot at end surface of air suction end |
| 11/06/1990 | US4968232 Axial sealing mechanism for a scroll type compressor |
| 11/06/1990 | US4968218 Method of controlling the air output of a screw compressor |
| 10/31/1990 | EP0394651A1 Compressed air vane motor |
| 10/30/1990 | US4966531 Variable displacement vane compressor |
| 10/30/1990 | CA1275642C Air pump vane assembly |
| 10/30/1990 | CA1275641C Micro-processor control of a movable slide stop and a movable slide valve in a helical screw rotary compressor with an economizer inlet port |
| 10/18/1990 | WO1990012210A1 Rotary-piston compressor |
| 10/17/1990 | EP0392975A1 Rotary scroll supercharger for compressible media |
| 10/17/1990 | EP0392231A2 Controlling device for rotary piston compressor |
| 10/17/1990 | CN1046209A Binary synchronous multiplying type compressor |
| 10/16/1990 | US4963079 Screw fluid machine with high efficiency bore shape |
| 10/10/1990 | EP0391182A2 Vacuum pump |
| 10/10/1990 | CN1046025A Method of machining scroll components |
| 10/10/1990 | CN1046007A 真空排放系统 Vacuum Release Systems |
| 10/02/1990 | US4960371 Rotary compressor for heavy duty gas services |
| 10/02/1990 | US4960370 Internal axis rotary piston machine |
| 09/26/1990 | EP0389036A1 Screw compressor and method of operation thereof |
| 09/26/1990 | EP0323979A4 Rotary machine |
| 09/25/1990 | US4958993 Scroll compressor with thrust support means |
| 09/25/1990 | US4958991 Scroll type compressor with discharge through drive shaft |
| 09/25/1990 | CA1274495A1 Rotary compressor with vane slot pressure groove |
| 09/25/1990 | CA1274494A1 Rotary compressor lubrication arrangement |
| 09/13/1990 | DE4007371A1 Outlet valve for rotary piston compressor |
| 09/13/1990 | DE3906584A1 Roots pump |
| 09/12/1990 | EP0387184A1 Horizontal scroll compressor |
| 09/12/1990 | CN1045291A Compressor for heat pump and method of operating said compressor |
| 09/11/1990 | US4956058 Aluminum or aluminum alloy scrolls, milling, electrolysis or polishing, aluminite wear resistant surfaces |
| 09/11/1990 | US4955795 Scroll apparatus control |