| Patents for F04C 28 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids (4,928) |
|---|
| 12/05/1990 | CA2018032A1 Liquid-ring compressor |
| 11/15/1990 | DE4001668A1 Mehrstufige vakuumpumpe Multi-stage vacuum pump |
| 11/06/1990 | US4968221 Intake valve for vacuum compressor |
| 11/06/1990 | US4968218 Method of controlling the air output of a screw compressor |
| 10/30/1990 | US4966531 Variable displacement vane compressor |
| 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 |
| 10/17/1990 | EP0392231A2 Controlling device for rotary piston compressor |
| 10/10/1990 | EP0391064A1 Intake valve for vacuum compressor |
| 10/02/1990 | US4960371 Rotary compressor for heavy duty gas services |
| 09/26/1990 | EP0323979A4 Rotary machine |
| 09/12/1990 | CN1045291A Compressor for heat pump and method of operating said compressor |
| 09/11/1990 | US4955795 Scroll apparatus control |
| 09/05/1990 | EP0385560A2 Compressor for heat pump and method of operating said compressor |
| 08/29/1990 | EP0383810A1 Rotary displacement compressor |
| 08/16/1990 | EP0381790A1 Method and device for the compression of a gaseous medium |
| 08/14/1990 | US4948345 Variable capacity compressor having a widened variable range of capacity |
| 08/09/1990 | DE4002419A1 Compressor for vehicle air conditioning system - incorporates control valve to reduce bellows vibration |
| 08/07/1990 | US4946362 Rotary screw compressor with a lift valve mounted in high pressure end wall |
| 07/10/1990 | US4940395 Scroll type compressor with variable displacement mechanism |
| 07/05/1990 | DE3906823A1 Vane vacuum pump |
| 06/28/1990 | WO1990007061A1 Pumping system for obtaining high vacuum |
| 06/27/1990 | EP0375207A2 Scroll apparatus control |
| 06/26/1990 | US4936761 Vane backpressure providing apparatus for sliding vane type compressor |
| 06/21/1990 | DE3840970A1 Rotating piston compressor for supercharging an internal combustion engine |
| 06/20/1990 | EP0373975A1 Pumping unit for obstaining a high vacuum |
| 06/20/1990 | EP0373269A1 Scroll type compressor with variable displacement mechanism |
| 06/19/1990 | US4934910 Scroll-type fluid apparatus with radially compliant driving means |
| 06/12/1990 | US4932844 Control section for a control system for controlling the internal volume of a rotary compressor |
| 05/29/1990 | US4929159 Variable-displacement rotary compressor |
| 05/29/1990 | US4929156 Variable capacity compressor |
| 05/22/1990 | US4927333 Fluid pump |
| 04/28/1990 | CA2001198A1 Rotary compressor of variable displacement type |
| 04/25/1990 | EP0365204A2 Helical screw rotary compressor |
| 04/17/1990 | US4917578 Variable capacity compressor |
| 04/03/1990 | US4913634 Screw compressor with slide valve movement preventing structure |
| 04/03/1990 | CA1267396A1 Rotor anti-reverse rotation arrangement in a screw compressor |
| 04/03/1990 | CA1267395A1 Rotary compressor relief valve |
| 03/20/1990 | US4909716 Screw step drive internal volume ratio varying system for helical screw rotary compressor |
| 03/15/1990 | DE3928778A1 Detecting approach positions between stator and rotor - by detecting contact in test circuit connected to stator and rotor shaft of spiral loader |
| 03/14/1990 | CN1040417A 旋转压缩机 Rotary compressor |
| 03/08/1990 | DE3828608A1 Vacuum-pump device |
| 02/28/1990 | EP0355260A2 Screw type vacuum pump |
| 02/27/1990 | US4904165 Muffler/check valve assembly for scroll compressor |
| 02/27/1990 | US4904164 Scroll type compressor with variable displacement mechanism |
| 02/14/1990 | EP0354867A2 Scroll type compressor |
| 02/07/1990 | EP0354161A2 Muffler/check valve assembly for scroll compressor |
| 01/25/1990 | DE3824213A1 Rotary-piston machine with infinitely adjustable fluid throughput |
| 01/24/1990 | EP0351690A1 Rotary scroll compressor for compressible fluids |
| 01/23/1990 | US4895220 Method for monitoring oil flow in an oil-lubricated vacuum pump |
| 01/10/1990 | EP0350426A2 Common compression zone access ports for positive displacement compressor |
| 01/09/1990 | US4892466 Variable capacity compressor |
| 01/03/1990 | EP0276252B1 Screw rotor compressor |
| 01/02/1990 | US4890987 Scroll type compressor with seal supporting anti-wear plate portions |
| 01/02/1990 | US4890986 Variable capacity compressor |
| 01/02/1990 | US4890985 Air conditioning system with variable capacity compressor |
| 12/28/1989 | WO1989012752A1 Rotary positive displacement compressor and refrigeration plant |
| 12/26/1989 | US4889474 Air conditioning system with variable capacity compressor |
| 12/26/1989 | US4889471 Mechanism for prevention of burning of bearing portions in a hermetic type scroll compressor |
| 12/20/1989 | EP0259333B1 Refrigeration plant and rotary positive displacement machine |
| 12/20/1989 | CN1006177B Scroll type compressor with variable displacement mechanism |
| 12/19/1989 | US4887943 Gas compressor of variable volume |
| 12/19/1989 | US4887580 Supercharger device for reciprocating internal combustion engines, particularly for motor vehicles |
| 12/12/1989 | US4886425 Capacity control device of scroll-type fluid compressor |
| 12/06/1989 | EP0344344A1 Method for controlling an oil lubricated vacuum pump |
| 12/05/1989 | US4884412 Compressor slugging protection device and method therefor |
| 12/05/1989 | CA1263724A1 Pure-air generator |
| 11/30/1989 | DE3817432A1 Method for preventing the freezing of liquid ring vacuum pumps or the like |
| 11/21/1989 | US4881878 Gas compressor of variable volume |
| 11/09/1989 | DE3913577A1 Auslassventil fuer einen verdichter Exhaust valve for a compressor |
| 11/07/1989 | US4878818 Common compression zone access ports for positive displacement compressor |
| 11/07/1989 | US4878814 Variable capacity compressor with capacity-indicating device |
| 11/02/1989 | WO1989010489A1 Lift valve in a rotary screw machine |
| 10/31/1989 | US4877384 Vane type rotary compressor |
| 10/31/1989 | US4877382 Scroll-type machine with axially compliant mounting |
| 10/31/1989 | US4877380 Control system for controlling the internal volume in a rotary compressor |
| 10/24/1989 | US4875835 Variable displacement compressor |
| 10/12/1989 | DE3838410A1 Shut-off valve for vacuum pumps |
| 10/04/1989 | EP0245427B1 Screw rotor compressor and refrigeration plant |
| 10/03/1989 | US4871299 Screw compressor unit including a centrifugal clutch |
| 09/26/1989 | US4869652 Variable capacity compressor |
| 09/26/1989 | CA1259972A1 Fluid compressor with rotational speed detecting device |
| 09/19/1989 | US4867651 Variable capacity vane compressor |
| 09/13/1989 | EP0332224A2 Apparatus for controlling a variable displacement compressor |
| 09/12/1989 | US4865531 Scroll compressor with super-charging tube |
| 09/12/1989 | US4865524 Variable capacity compressor |
| 08/29/1989 | US4861235 Variable capacity type compressor |
| 08/22/1989 | US4859154 Variable-delivery vane-type rotary compressor |
| 08/09/1989 | EP0326663A2 Slide-controlled screw rotor machine and supercharged internal-combustion engine equipped therewith |
| 08/02/1989 | EP0326189A1 Scroll type compressor with variable displacement mechanism |
| 07/25/1989 | US4850815 Variable capacity vane compressor |
| 07/19/1989 | EP0323979A1 Rotary machine |
| 07/11/1989 | US4846633 Variable-capacity scroll-type compressor |
| 07/11/1989 | US4846632 Variable displacement vane compressor |
| 07/06/1989 | DE3842886A1 Vacuum pump stand |
| 07/04/1989 | US4844703 Air conditioning system for a vehicle |
| 07/04/1989 | US4844702 Lubrication circuit of rotary vacuum pumps |
| 06/27/1989 | US4842501 Device for controlling the internal compression in a screw compressor |
| 06/27/1989 | US4842490 Variable displacement vane compressor |
| 06/21/1989 | EP0320956A2 Screw type vacuum pump |
| 06/21/1989 | EP0320684A2 Control apparatus for rotary air compressors |