| Patents for F04D 27 - Control, e.g. regulation, of pumps, pumping nstallations or pumping systems specially adapted for elastic fluids (9,590) |
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| 05/20/1998 | EP0654163A4 Process and device for monitoring vibrational excitation of an axial compressor. |
| 05/20/1998 | EP0654162A4 Process for detecting fouling of an axial compressor. |
| 05/20/1998 | EP0654161A4 Process and device for monitoring and for controlling of a compressor. |
| 05/19/1998 | US5752379 Non-recoverable surge and blowout detection in gas turbine engines |
| 05/19/1998 | US5752378 Prevention of parameter excursions in gas turbines |
| 05/13/1998 | CN1181490A Compressor for use in refrigerator |
| 05/06/1998 | EP0839285A2 Compressor stall and surge control using airflow asymmetry measruement |
| 05/06/1998 | CN1181161A Electric drive device for railway rolling stock and rolling stock constrained by rail |
| 05/05/1998 | US5746581 Method and apparatus for evacuating vacuum system |
| 05/05/1998 | US5746062 Methods and apparatuses for detecting surge in centrifugal compressors |
| 04/30/1998 | WO1998017917A1 Electric-motor-driven blower |
| 04/30/1998 | DE19644892A1 Intake control for turbo machines and IC engines |
| 04/30/1998 | DE19644432A1 Electric fan having electric motor with control circuit for use in motor vehicle |
| 04/28/1998 | US5743715 Method and apparatus for load balancing among multiple compressors |
| 04/28/1998 | US5743714 Method and apparatus for minimum work control optimization of multicompressor stations |
| 04/23/1998 | WO1998016747A1 Compressor |
| 04/23/1998 | DE19643339A1 Elektromotorisch betriebenes Gebläse Electric motor-driven blower |
| 04/22/1998 | EP0837231A2 Gaseous fuel compression and control system and method |
| 04/15/1998 | EP0836009A2 An electronic control unit for a vacuum pump |
| 04/15/1998 | EP0836008A2 A vacuum pumping device |
| 04/08/1998 | CN1178293A Variable pipe diffuser for centrifugal compressor |
| 04/07/1998 | US5736823 In an air handling system |
| 04/02/1998 | DE19705134A1 Computer system processor cooling fan control method |
| 04/01/1998 | EP0833059A2 Gas compression method |
| 03/26/1998 | WO1998012435A1 Centrifugal compressor and turbo refrigerating machine using same |
| 03/25/1998 | EP0830511A1 Method of controlling the function of a centrifugal pump and vacuum pump combination, and a gas-separating centrifugal pump |
| 03/25/1998 | CN2277005Y Front-mounted fluid regulating energy saver of centrifugal fluid machinery |
| 03/25/1998 | CN2277004Y Speed governer of ceiling fan |
| 03/24/1998 | US5730580 Turbomachines having rogue vanes |
| 03/18/1998 | EP0733159B1 Closed loop stator vane control |
| 03/17/1998 | US5727928 Fan speed monitoring system for determining the speed of a PWM fan |
| 03/11/1998 | CN2276089Y Multipump speed regulating controller |
| 03/10/1998 | US5726891 Surge detection system using engine signature |
| 03/05/1998 | WO1998009066A1 Variable pressure and variable air flow gas turbine engines |
| 03/04/1998 | EP0826266A2 Electric motor drive |
| 03/04/1998 | EP0826265A1 Electric drive system for railway vehicles and guided vehicles |
| 03/04/1998 | EP0826264A1 Electric drive system for railway vehicles and guided vehicles |
| 03/03/1998 | US5723967 Method of starting a brushless motor for driving a compressor in a refrigerating cycle |
| 02/19/1998 | DE19703658A1 Gas-turbine installation thermal stresses reduction method |
| 02/12/1998 | WO1998005867A1 Centrifugal ventilation device with improved performance comprising at least two suction inlets and related method |
| 02/11/1998 | EP0823555A1 Centrifugal ventilation device of enhanced performance having at least two suction inlets and related ventilation method |
| 02/05/1998 | WO1998004835A1 Process for regulating a unit or a frequency converter |
| 02/04/1998 | CN1172255A Characteristic comparative measurement system of motor fan in vacuum cleaner |
| 01/29/1998 | DE19630036A1 Semiconductor control switch e.g. for electric load such as motor vehicle DC fan-motor speed control |
| 01/28/1998 | CN1171542A Direction control apparatus for condenser fan |
| 01/20/1998 | US5709526 Surge recurrence prevention control system for dynamic compressors |
| 01/14/1998 | EP0817917A1 Circulating blower, vacuum pump or the like |
| 01/14/1998 | CN1170491A Improved air control system for air bed |
| 01/07/1998 | EP0816686A2 Direction control apparatus for condenser fan |
| 12/29/1997 | EP0814269A2 Air moving device |
| 12/18/1997 | WO1997047929A1 Ventilation system, particularly for use in the agricultural field |
| 12/17/1997 | CN1167881A Recirculating diffuser |
| 12/10/1997 | EP0811770A1 Variable pipe diffuser for centrifugal compressor |
| 12/10/1997 | EP0811768A1 Recirculating diffuser |
| 12/04/1997 | DE19722421A1 Measurement system for comparing characteristic parameters of vacuum cleaner motor driven fan |
| 11/27/1997 | WO1997044719A1 Method for detecting the occurrence of surge in a centrifugal compressor |
| 11/11/1997 | US5685699 Compressor transmission vent system |
| 11/04/1997 | US5683223 Surge detection device and turbomachinery therewith |
| 10/16/1997 | WO1997038270A1 Methods and apparatuses for detecting surge in centrifugal compressors |
| 10/15/1997 | CN2264820Y Brushless dc fan |
| 09/23/1997 | US5669756 Recirculating diffuser |
| 09/10/1997 | CN1159163A Closed coupled series turbine mounting |
| 09/09/1997 | US5664939 Circulator pump check valve |
| 09/03/1997 | EP0752065B1 Process for controlling the driving voltage of a fan in electrical equipment |
| 08/20/1997 | EP0789976A1 Improved air control system for an air bed |
| 08/19/1997 | US5658125 Magnetic bearings as actuation for active compressor stability control |
| 08/19/1997 | US5657640 Air conditioner |
| 08/12/1997 | US5655616 Hovercraft and process of regulating air cushion |
| 08/07/1997 | WO1997028370A1 Turbomachinery driving apparatus and method of controlling the same |
| 08/06/1997 | EP0788215A2 Blower motor with adjustable timing |
| 07/30/1997 | CN1155631A Electrically controlling clutch for swinging mechanism of electric fan |
| 07/30/1997 | CN1155630A Turbomachinery with variable-angle fluid guiding vanes |
| 07/29/1997 | US5652484 For controlling the firmness of a fluid supported mattress |
| 07/10/1997 | WO1997024591A1 Surge prevention control system for dynamic compressors |
| 07/10/1997 | WO1997024512A1 Surge recurrence prevention control system for dynamic compressors |
| 07/09/1997 | CN1154157A Apparatus for preventing reverse operation of compressor |
| 07/02/1997 | EP0681540B1 Hovercraft |
| 06/25/1997 | EP0780032A1 Circuit for operating an electric motor |
| 06/25/1997 | EP0779831A1 Close coupled series turbine mounting |
| 06/17/1997 | US5639222 Close coupled series turbine mounting |
| 06/11/1997 | EP0777828A1 Compressor stall diagnostics and avoidance |
| 06/10/1997 | US5636971 Regulation of fluid conditioning stations |
| 06/03/1997 | US5634772 System for controlling operation of turbo type fluid machinery |
| 05/28/1997 | EP0775830A1 Apparatus for preventing reverse operation of compressor |
| 05/28/1997 | EP0775338A1 Method and apparatus for supplying a pressurized compressible medium to a network |
| 05/22/1997 | DE19543181A1 Multiple impeller for compressor |
| 05/21/1997 | EP0606475B1 Turbo-machine |
| 05/14/1997 | CN2254130Y Auto-controlled variable input air control box for fan |
| 05/14/1997 | CN2254129Y Time delay exhaust fan |
| 05/07/1997 | EP0771950A1 A method for protecting a turbo compressor from operating in an unstable range by means of valves having two velocities |
| 05/06/1997 | US5627527 Thermostatically controlled remote control for a ceiling fan and light |
| 05/02/1997 | EP0770782A1 Turbo compressor |
| 04/24/1997 | DE19540494A1 Regulating method for compressor power of gas turbines |
| 04/23/1997 | EP0769624A1 Method and apparatus for load balancing among multiple compressors |
| 04/23/1997 | EP0688400B1 Anti-stall tip treatment means |
| 04/21/1997 | CA2184130A1 Method and apparatus for load balancing among multiple compressors |
| 04/16/1997 | CN1034606C Centrifugal compressor with a flow-stabilizing casing |
| 04/16/1997 | CN1034605C Stabilizing device for extending the characteristic diagram of compressor |
| 04/08/1997 | US5618160 Turbomachinery with variable angle fluid guiding devices |
| 03/20/1997 | WO1997010019A1 Flow estimation and compensation of flow-induced pressure swings in cpap treatment and assisted respiration |