| 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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| 09/14/1999 | US5950443 Compressor minimum capacity control |
| 09/14/1999 | CA2127340C Apparatus and method of oil charge loss protection for compressors |
| 09/14/1999 | CA2088824C Capacity control mechanism for scroll-type compressor |
| 09/10/1999 | WO1999045274A1 Scroll compressor with combined pressure ratio and pressure differential relief valve |
| 09/07/1999 | US5947701 Simplified scroll compressor modulation control |
| 08/25/1999 | EP0937895A2 Screw fluid machine |
| 08/25/1999 | EP0937894A2 Screw fluid machine and screw gear used in the same |
| 08/24/1999 | USRE36281 Valve system for capacity control of a screw compressor and method of manufacturing such valves |
| 08/24/1999 | USRE36274 Method of manufacturing valve system for capacity control of a screw compressor |
| 08/17/1999 | CA2176909C Refrigerant compressor with rotation detecting means |
| 08/11/1999 | CN1044633C Vortex hydraulic mechanism |
| 08/05/1999 | WO1999039104A1 Variable displacement compressor |
| 08/04/1999 | EP0933531A1 Scroll compressor |
| 08/04/1999 | EP0932767A1 A screw compressor with adjustment slide means |
| 08/03/1999 | US5931649 Motor compressor |
| 08/03/1999 | US5931008 Protecting device for car air conditioner |
| 07/28/1999 | EP0931936A1 Gerotor motor and improved valve drive and brake assembly therefor |
| 07/06/1999 | US5919033 Pump having relief valve seat free of direct structural restraint |
| 06/30/1999 | EP0823025B1 Screw-type compressor with water hammer protection |
| 06/30/1999 | CN1221477A Scroll type fluid machine |
| 06/23/1999 | EP0924433A1 Scroll-type compressor |
| 06/23/1999 | EP0924429A1 Scroll compressor |
| 06/23/1999 | CN1220347A Scroll-type compressor and operation method therefor |
| 06/23/1999 | CN1220346A Capacity-controlled scroll-type compressor having internally-bypassing system |
| 06/22/1999 | US5913664 Safety relief valve assembly for a fluid displacement apparatus |
| 06/18/1999 | CA2256152A1 Capacity-controlled scroll-type compressor having internally-bypassing system |
| 06/15/1999 | US5911743 Expansion/separation compressor system |
| 06/02/1999 | CN1218145A Compressor having capacity-controlling mechanism with abrasion-free cylinder |
| 05/19/1999 | EP0916848A1 Compressor having capacity-controlling mechanism with abrasion-free cylinder |
| 05/19/1999 | CN1216803A Scroll compressor with pressure equalization groove |
| 05/06/1999 | EP0913581A1 Scroll compressor with pressure equalization groove |
| 05/06/1999 | EP0630441B1 Screw compressor providing thrust bearing force compensation |
| 05/04/1999 | US5899677 Vane compressor having a high-pressure space formed in the cam ring |
| 04/27/1999 | US5897306 Partition and pilot ring for scroll machine |
| 04/22/1999 | WO1999019631A1 Screw vacuum pump provided with rotors |
| 04/15/1999 | WO1999018425A1 Multi-lobe pump for particle counters |
| 04/15/1999 | DE19745615A1 Screw vacuum pump with rotors |
| 04/14/1999 | CN1213744A Scroll compressor with economizer fluid passage defined adjacent end face of fixed scroll |
| 04/14/1999 | CN1042969C 涡旋压缩机 Scroll Compressor |
| 04/13/1999 | CA2079261C Co-rotational scroll compressor supercharger device |
| 04/08/1999 | WO1999017178A1 Systems and methods for remotely controlling a machine |
| 04/08/1999 | WO1999017066A1 An adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor |
| 04/07/1999 | EP0907026A1 Scroll compressor with economizer fluid passage defined adjacent end face of fixed scroll |
| 04/06/1999 | US5890884 Screw-type compressor with liquid lock protection |
| 03/31/1999 | EP0746685B1 Scroll compressor drive having a brake |
| 03/24/1999 | CN1211686A Helical lobe compressor |
| 03/23/1999 | US5885063 Variable capacity scroll compressor |
| 03/23/1999 | US5884494 Oil flow protection scheme |
| 03/23/1999 | CA2068776C Scroll type fluid displacement apparatus having a capacity control mechanism |
| 03/18/1999 | WO1999013225A1 Oil flow protection scheme |
| 03/17/1999 | EP0902188A1 Screw compressor |
| 03/17/1999 | EP0902187A1 Scroll type compressor with soft start |
| 03/17/1999 | CN1210945A Scroll compressor |
| 03/10/1999 | EP0900939A1 Scroll compressor |
| 03/10/1999 | CN1210205A Vortex compressor |
| 03/09/1999 | US5879146 Stepped wear indicator for a radial compressor |
| 02/25/1999 | DE19736017A1 Vacuum pump or compressor for compacting gases |
| 02/23/1999 | US5873707 For controlling fluid communication |
| 02/23/1999 | US5873706 Valved suction mechanism for refrigerant compressor |
| 02/18/1999 | WO1999008002A1 Compressor minimum capacity control |
| 02/16/1999 | US5871342 Variable capacity rolling piston compressor |
| 02/16/1999 | US5871338 Vacuum pump with a gas ballast device |
| 02/16/1999 | CA2089783C Scroll type compressor with variable displacement mechanism |
| 02/03/1999 | EP0894980A2 Vane compressor with delivery pressure control |
| 01/28/1999 | WO1999004168A1 Single-source gas actuation for screw compressor slide valve assembly |
| 01/26/1999 | US5863191 Scroll compressor having a discharge muffler chamber |
| 01/26/1999 | CA2136025C Piston unloader arrangement for screw compressors |
| 01/21/1999 | DE19831792A1 Automobile air-conditioning system |
| 01/19/1999 | US5860801 Rotary screw compressor with unloading means |
| 01/19/1999 | US5860797 Flow rate control device for a pump |
| 01/19/1999 | US5860791 Scroll compressor with end-plate valve having a conical passage and a free sphere |
| 01/13/1999 | EP0663986B1 Dry-compression vacuum pump |
| 01/05/1999 | US5855475 Scroll compressor having bypass valves |
| 12/29/1998 | US5853288 Scroll compressor having a counterboring part communicating with an intermediate pressure chamber |
| 12/22/1998 | CA2174200C Scroll compressor having a suction check valve |
| 12/17/1998 | WO1998057104A1 Start-up method and apparatus in refrigeration chillers |
| 12/17/1998 | WO1998057066A1 Scroll type fluid machine |
| 12/17/1998 | CA2254730A1 Scroll type fluid machine |
| 12/16/1998 | EP0883746A1 Vapor recovery pump |
| 12/10/1998 | WO1998055768A1 Pulsating capacity regulation system |
| 12/08/1998 | US5846066 Vacuum pumps with claw-type rotor and roots-type rotor near the outlet |
| 12/08/1998 | US5846065 Scroll compressor with axial biasing |
| 12/02/1998 | EP0881393A1 Hermetic compressor and refrigerating air condioners using it |
| 12/01/1998 | US5842354 Climate controller for automobiles |
| 11/25/1998 | EP0879964A1 Positive displacement pump |
| 11/25/1998 | CN1199674A Protecting device for car air conditioner |
| 11/19/1998 | WO1998051931A1 Capacity control scroll compressor |
| 11/19/1998 | WO1998051930A1 Capacity control scroll compressor |
| 11/17/1998 | US5836754 Screw fluid machine and screw gear used in the same |
| 11/10/1998 | US5832737 Gas actuated slide valve in a screw compressor |
| 11/05/1998 | WO1998026181A3 Gerotor pump for liquid media |
| 11/04/1998 | EP0843777A4 Reverse rotation preventing clutch |
| 11/04/1998 | EP0741851B1 Refrigeration system and a method for regulating the refrigeration capacity of such a system |
| 11/04/1998 | CN1197892A Partition and pilot ring for scroll machine |
| 11/03/1998 | US5829957 Screw fluid machine and screw gear used in the same |
| 10/29/1998 | WO1998048172A1 Improvements to impeller pumps |
| 10/22/1998 | WO1998046885A1 Vacuum pump system fitted with a liquid mechanical pump |
| 10/21/1998 | EP0872641A1 Hermetic scroll compressor |
| 10/21/1998 | CN1196776A Scroll compressor |
| 10/21/1998 | CN1196775A Scroll compressor |