| 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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| 04/28/1992 | US5108269 Method of controlling a rotary compressor |
| 04/15/1992 | EP0480560A2 Scroll machine with overheating protection |
| 04/15/1992 | EP0480065A1 Scroll compressor |
| 04/08/1992 | EP0479421A1 Scroll machine with floating seal |
| 04/07/1992 | US5102316 Non-orbiting scroll mounting arrangements for a scroll machine |
| 04/01/1992 | EP0478378A2 Check valve for compressor |
| 03/31/1992 | US5099976 Fire extinguishing apparatus for compressors |
| 03/25/1992 | EP0476631A1 Multistage vacuum pump |
| 03/11/1992 | EP0474066A1 Gas pumping apparatus by a liquid sealed vane pump and application to helium leakage detectors |
| 03/10/1992 | US5094598 Capacity controllable compressor apparatus |
| 03/10/1992 | US5094592 Variable capacity vane compressor having a seal protective structure |
| 03/10/1992 | US5094085 Refrigerating cycle apparatus with a compressor having simultaneously driven two compressor means |
| 03/03/1992 | US5093864 Silencer |
| 02/25/1992 | US5090880 Scroll compressor with discharge valves |
| 02/25/1992 | US5090392 Control system for engine with supercharger |
| 02/20/1992 | DE4026669C1 Mechanical vacuum pump - has cylindrical bore in housing with parallel inlet and outlet lines and rotor with spring-loaded vanes |
| 02/18/1992 | US5088905 Check valve for scroll compressor |
| 02/12/1992 | EP0470459A1 Compressor |
| 01/28/1992 | US5083907 Roots-type blower with improved inlet |
| 01/21/1992 | US5082427 Screw compressing apparatus, rotor temperature control apparatus for screw compressing apparatus and operating control apparatus for screw compressing apparatus |
| 01/21/1992 | US5081876 Slide valve position indicator and magnetic coupler |
| 01/08/1992 | EP0464316A1 Screw compressor |
| 01/08/1992 | EP0464315A1 Oil-flooded screw compressor |
| 01/08/1992 | EP0464282A2 Scroll compressor discharge valve |
| 01/07/1992 | US5078583 Inlet port opening for a roots-type blower |
| 12/31/1991 | US5076067 Compressor with liquid injection |
| 12/25/1991 | CN1015193B Compressor for heat pump and method of operating said compressor |
| 12/24/1991 | US5074761 Rotary compressor |
| 12/24/1991 | US5074760 Scroll type compressor |
| 12/17/1991 | US5073089 Liquid-ring compressor |
| 12/11/1991 | EP0460578A1 Screw fluid machine |
| 12/10/1991 | US5071323 Scroll compressor with bypass release passage in stationary scroll member |
| 11/27/1991 | EP0458135A1 Roots-type blower with improved inlet |
| 11/27/1991 | EP0458134A1 Inlet port opening for a Roots-type blower |
| 11/26/1991 | US5067878 Discharge flow blocking valve for a hermetic rotary compressor |
| 11/21/1991 | EP0457491A1 Gerotor pumps |
| 11/14/1991 | WO1991017360A1 Scroll compressor |
| 11/12/1991 | US5063750 Rotary positive displacement compressor and refrigeration plant |
| 10/23/1991 | EP0452896A1 Lubrication for scroll compressor |
| 10/22/1991 | US5059098 Apparatus for varying capacity of scroll type compressor |
| 10/22/1991 | CA1291094C Compressor unit for the production of compressed air |
| 10/18/1991 | CA2040721A1 Hermetically sealed scroll type refrigerant compressor with an improved lubricating mechanism |
| 10/16/1991 | CN1014346B Rotary compressor |
| 10/15/1991 | US5056990 Variable capacity vane compressor |
| 10/08/1991 | US5055012 Scroll compressor with bypass release passage in stationary scroll member |
| 10/02/1991 | EP0448750A1 Multistage dry compressing vacuum pump and method for its operation |
| 10/01/1991 | US5052901 Lift valve in a rotary screw machine |
| 10/01/1991 | US5052899 Anti-surge compressor loading system |
| 09/24/1991 | US5051070 Variable capacity compressor |
| 09/17/1991 | US5050233 Rotary compressor |
| 09/17/1991 | US5049044 Compressor for heat pump and method of operating said compressor |
| 09/17/1991 | US5049043 Variable capacity vane compressor |
| 09/17/1991 | US5049042 Anti-return safety apparatus |
| 09/17/1991 | US5048559 Valve and apparatus using said valve |
| 09/03/1991 | US5044909 Valve device for control of the inner volume relation in a screw type rotary compressor |
| 09/03/1991 | US5044894 Capacity volume ratio control for twin screw compressors |
| 08/20/1991 | US5040949 Two stage dry primary pump |
| 08/13/1991 | US5039280 Pump assembly for obtaining a high vacuum |
| 07/30/1991 | US5035584 Variable-delivery vane-type rotary compressor |
| 07/09/1991 | US5030066 Variable-delivery vane-type rotary compressor |
| 07/02/1991 | US5027608 Method and apparatus for determining full load condition in a screw compressor |
| 06/25/1991 | US5026257 Variable displacement vane-type rotary compressor |
| 06/12/1991 | EP0432085A2 Protection for electrically driven device |
| 06/04/1991 | US5020976 Variale capacity vane compressor |
| 06/04/1991 | US5020975 Variable-delivery vane-type rotary compressor |
| 05/28/1991 | US5018948 Rotary displacement compressor with adjustable outlet port edge |
| 05/28/1991 | US5018947 Screw type vacuum pump |
| 05/21/1991 | US5017097 Control valve device for variable capacity compressors |
| 05/16/1991 | WO1991006776A1 Scroll compressor |
| 05/16/1991 | WO1991006775A1 Method of manufacturing scroll compressor |
| 05/16/1991 | WO1991006769A1 Scroll compressor |
| 05/07/1991 | US5013217 Compressing apparatus with extended variable capacity range and capacity control method thereof |
| 04/23/1991 | US5009577 Rotary compressor of variable displacement type |
| 04/23/1991 | US5009212 Port fuel injection and induction system for internal combustion engine |
| 04/17/1991 | EP0422829A1 Scroll machine with reverse rotation protection |
| 04/09/1991 | CA1282753C Variable volume ratio screw compressor with step control |
| 04/03/1991 | EP0419531A1 Rotary positive displacement compressor and refrigeration plant. |
| 04/02/1991 | CA1282386C Scroll type compressor with displacement adjusting mechanism |
| 03/26/1991 | US5002470 Internal stator rolling rotor motor driven scroll compressor |
| 03/12/1991 | US4998864 Scroll machine with reverse rotation protection |
| 03/06/1991 | EP0415317A2 No-return security apparatus |
| 03/06/1991 | EP0415315A1 Primary vacuum pump |
| 03/06/1991 | EP0415311A2 Valve and device using the same |
| 02/27/1991 | EP0413728A1 Lift valve in a rotary screw machine |
| 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 | US4991562 Mechanical supercharger system |
| 02/05/1991 | US4990072 Rotating helical charger with axially movable displacement disk |
| 02/05/1991 | US4989414 Capacity-controllable air conditioner |
| 01/15/1991 | US4984974 Screw type vacuum pump with introduced inert gas |
| 01/08/1991 | CA1278691C Temperature sensitive solenoid valve in a scroll compressor |
| 12/27/1990 | EP0403829A2 Rotary compressor with oleopneumatic delivery control device |
| 12/20/1990 | DE3925222A1 Pressure control for door closing mechanism - makes use of piston-actuated check valve system |
| 12/19/1990 | EP0403239A2 Capacity controllable compressor apparatus |
| 12/12/1990 | EP0401741A1 Two stage primary dry pump |
| 12/12/1990 | EP0401485A1 A compressor unit for the production of compressed air for industrial uses |
| 12/12/1990 | EP0401397A1 Liquid-ring compressor |
| 12/11/1990 | US4976592 Variable capacity vane compressor |
| 12/06/1990 | CA2014077A1 Compressor unit for the production of compressed air for industrial uses |