| Patents for F04C 28 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids (4,928) |
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| 11/22/1994 | US5366359 Scroll compressor orbital scroll drive and anti-rotation assembly |
| 11/22/1994 | US5366348 Method and apparatus for selectively varying the flow rate of service liquid through a two stage liquid ring vacuum pump |
| 11/22/1994 | US5366347 Suspension pump with built-in variably eccentric liquid ring pump |
| 11/17/1994 | DE4316195A1 Oil-sealed vacuum pump with pressure-oil lubrication |
| 11/15/1994 | US5364235 Variable capacity vane compressor with axial pressure device |
| 11/09/1994 | EP0623749A1 Rotary gas compressor |
| 11/08/1994 | US5362211 Scroll type fluid displacement apparatus having a capacity control mechanism |
| 11/08/1994 | US5362210 Scroll compressor unloader valve |
| 11/03/1994 | DE4333980C1 Flushing-gas source |
| 11/02/1994 | EP0622547A1 Speed detector of scroll-type fluid machine |
| 10/26/1994 | CN1094134A Rotary-vane pump with improved discharge rate control means |
| 10/25/1994 | US5358391 Hermetic compressor with heat shield |
| 10/25/1994 | US5358387 Oil-free scroll compressor |
| 10/18/1994 | US5356271 Capacity control mechanism for scroll-type compressor |
| 10/11/1994 | CA2012693C Intake valve for vacuum compressor |
| 10/04/1994 | US5352098 Turn valve control system for a rotary screw compressor |
| 10/04/1994 | US5352097 Vacuum pump |
| 09/27/1994 | US5350280 Fluid compressor |
| 09/20/1994 | US5348455 Rotary compressor with rotation preventing pin |
| 09/20/1994 | US5348448 Fluid rotating apparatus with plural drive motor synchronization system |
| 09/20/1994 | US5347972 Supercharge pressure control system in internal combustion engine |
| 09/20/1994 | US5347821 Apparatus and method of oil charge loss protection for compressors |
| 09/13/1994 | US5346376 Axial thrust applying structure for the scrolls of a scroll type compressor |
| 09/13/1994 | US5346375 Delivery valve for a scroll compressor |
| 09/06/1994 | US5344313 Fugitive volatile organic compound vapor collection system |
| 09/01/1994 | WO1994019610A1 Liquid ring machine and process for operating it |
| 08/30/1994 | US5342186 Axial actuator for unloading an orbital scroll type fluid material handling machine |
| 08/30/1994 | US5342185 Muffler plate for scroll machine |
| 08/18/1994 | WO1994018456A1 Control system for screw type supercharging apparatus |
| 08/11/1994 | DE4404054A1 Refrigerant spiral compressor with casing protection devices |
| 08/09/1994 | US5336058 Scroll-type compressor with variable displacement mechanism |
| 08/03/1994 | EP0608311A1 Inlet control combination for a compressor system |
| 08/02/1994 | US5333999 Variable displacement compressor |
| 07/27/1994 | EP0608073A1 Scroll compressor having high temperature control |
| 07/26/1994 | CA1330973C Scroll type compressor with variable displacement mechanism |
| 07/21/1994 | DE3744760C2 Compacting machine compressing fluid e.g. refrigeration compressor |
| 07/14/1994 | DE4400684A1 Blade-type pump with control device for discharge volume |
| 07/13/1994 | CN1025449C Turbocompressor with variable quantity mechanism |
| 06/29/1994 | EP0604358A1 A scroll compressor with a thermally responsive bypass valve for high temperature protection |
| 06/28/1994 | CA1330430C Scroll type compressor |
| 06/16/1994 | DE4243430A1 Screw compressor with hydraulic load control - uses sliding control valve attached to piston in cylinder and function plate with oil passages |
| 06/15/1994 | EP0601789A1 Scroll machine with reverse rotation protection |
| 06/14/1994 | US5320507 Scroll machine with reverse rotation protection |
| 06/14/1994 | CA2074444C Combination lift piston/axial port unloader arrangement for a screw compressor |
| 06/07/1994 | CA2052318C Scroll type compressor |
| 06/07/1994 | CA2050693C Scroll type compressor |
| 05/31/1994 | US5316448 Process and a device for increasing the efficiency of compression devices |
| 05/18/1994 | EP0597732A1 Vacuum pump with inlet oil-controlled valve |
| 05/18/1994 | EP0597730A1 Two stage vacuum pump |
| 05/11/1994 | WO1994010425A1 Scroll compressor drive having a brake |
| 05/04/1994 | CN1086293A Vortex volume-type fluid displacement device |
| 05/03/1994 | CA1329184C Common compression zone access ports for positive displacement compressor |
| 05/03/1994 | CA1329182C Scroll compressor with anti-fluttering valves for the variable displacement mechanism |
| 04/28/1994 | WO1994009275A1 Process for operating a dry-compression vacuum pump |
| 04/14/1994 | DE4234169A1 Verfahren zum Betrieb einer trockenverdichteten Vakuumpumpe sowie für dieses Betriebsverfahren geeignete Vakuumpumpe Method for operating a dry compressed vacuum pump and suitable for this method of operation vacuum pump |
| 03/31/1994 | DE4232119A1 Double shaft vacuum roots pump - has two rotors forming working and control pistons and housing having overflow valve in discharge aperture with excess pressure valves in side parts on pressure socket |
| 03/22/1994 | US5295813 Scroll-compressor having flat driving surfaces |
| 03/22/1994 | US5295362 Refrigeration system |
| 03/09/1994 | EP0585911A1 Two stage primary dry pump |
| 03/02/1994 | EP0584177A1 A rotary displacement compressor and a method for regulating a rotary displacement compressor. |
| 03/01/1994 | US5290161 Control system for a clutchless scroll type fluid material handling machine |
| 03/01/1994 | US5290154 Scroll compressor reverse phase and high discharge temperature protection |
| 02/08/1994 | US5284426 Rotary compressor with multiple compressor stages and pumping capacity control |
| 02/01/1994 | US5282729 Radical actuator for a de-orbiting scroll in a scroll type fluid handling machine |
| 02/01/1994 | US5282728 Inertial balance system for a de-orbiting scroll in a scroll type fluid handling machine |
| 01/11/1994 | US5277564 Closed type scroll compressor with spherical slide bearing for the oil tube |
| 01/06/1994 | WO1994000692A1 Piston unloader arrangement for screw compressors |
| 01/06/1994 | WO1994000680A1 A method and a device for supplying air to an internal combustion engine |
| 01/05/1994 | DE4221494A1 Variable output rotor compressor - has two speed ranges with variable shutter operating over each range separately |
| 12/29/1993 | EP0576415A1 Suction control valve |
| 12/22/1993 | CN1023245C Scroll type compressor |
| 12/22/1993 | CN1023244C Scroll-type compressor |
| 12/21/1993 | US5271719 Fluid rotating apparatus and method of controlling the same |
| 12/14/1993 | US5269661 Scroll type fluid displacement apparatus having a capacity control mechanism |
| 11/18/1993 | EP0570114A1 Control system for prime driver of compressor and method |
| 11/18/1993 | DE4215821A1 Internal vol. ratio control of helical refrigerant compressor - involves three-stage repositioning or retiming of opening to outlet of gaps between rotor teeth at full load |
| 11/16/1993 | US5261802 Screw vacuum pump |
| 11/02/1993 | US5257921 Electronic slide valve position indicator |
| 10/26/1993 | US5256042 Bearing and lubrication system for a scroll fluid device |
| 10/19/1993 | US5253481 Control unit for activating compressor |
| 10/07/1993 | DE4310621A1 Rotating piston machine for compression of gaseous mediums - has intake and discharge sockets relatively offset on housing parallel to rotor axis |
| 10/06/1993 | EP0564123A1 Refrigeration system |
| 09/30/1993 | WO1993019298A1 Method of operating an oil-sealed vacuum pump |
| 09/30/1993 | WO1993019295A1 Scroll machine with overheating protection |
| 09/28/1993 | US5248244 Scroll compressor with a thermally responsive bypass valve |
| 09/16/1993 | WO1993018307A1 Compressor slide valve control |
| 09/16/1993 | WO1993018280A1 Screw compressor providing thrust bearing force compensation |
| 09/16/1993 | DE4307745A1 Variable delivery compressor with eccentrically mounted rotor - has by=pass channel between chambers which is opened and closed by folding bellows. |
| 09/16/1993 | DE4208194A1 Verfahren zum betrieb einer oelgedichteten vakuumpumpe sowie fuer die durchfuehrung dieses verfahrens geeignete vakuumpumpe A method of operating a oelgedichteten vacuum pump and for the implementation of this method suitable vacuum pump |
| 09/14/1993 | US5244353 Gas pumping installation having means for regulating its pumping speed |
| 09/08/1993 | EP0558921A1 Synchronous rotating apparatus of plurality of shafts |
| 09/07/1993 | US5242280 Rotary type multi-stage compressor with vanes biased by oil pressure |
| 09/02/1993 | WO1993017241A1 Bearing and lubrication system for a scroll fluid device |
| 09/02/1993 | DE4305876A1 Spiral compressor with anti-spin mechanism - uses counter mass with cylindrical depression to balance rotating spiral element |
| 08/31/1993 | US5240389 Scroll type compressor |
| 08/31/1993 | US5240388 Scroll type compressor with variable displacement mechanism |
| 08/31/1993 | US5240387 Variable capacity vane compressor having an improved bearing arrangement for a drive shaft and a capacity control element |
| 08/25/1993 | EP0557023A1 Scroll type compressor with variable displacement mechanism |
| 08/18/1993 | EP0555945A1 A capacity control mechanism for scroll-type compressor |
| 08/17/1993 | US5236320 Oil injection type screw compressor |