| 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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| 05/22/1990 | CA1269432A1 Adaptive gain compressor surge control system |
| 05/17/1990 | WO1990002878A3 Electronically controlled cryopump |
| 05/16/1990 | EP0368557A2 Compressor system comprising a surge detection system |
| 05/16/1990 | CN2057245U Electronic timing speed regulator |
| 05/16/1990 | CN2057244U Speed regulator of electric fan |
| 05/16/1990 | CN1042220A Controller of fan |
| 05/09/1990 | CN2056947U Foldable breeze ceiling fan with adjustable blowing rate |
| 05/02/1990 | EP0366219A2 Method and apparatus for preventing surge in a dynamic compressor |
| 05/01/1990 | US4921399 Gas pipeline temperature control |
| 04/25/1990 | CN2056464U Change lever adjustor for controlling tilting head swing angle of electric fan |
| 04/24/1990 | US4918930 Electronically controlled cryopump |
| 04/18/1990 | CN2056199U Gearshift switch of speed-regulator for sliding rod electric fan |
| 04/18/1990 | CN2056198U Ceiling fan with speed-regulating switch |
| 04/11/1990 | CN2055876U Multifunction speed governor for ceiling fan |
| 03/28/1990 | CN2055200U Temp. controlling wind flow device used in fan coil pipe |
| 03/28/1990 | CN2055199U Microwave remote-control device for electric fan |
| 03/22/1990 | WO1990002881A1 Simplified inlet guide vane construction for a rotary compressor |
| 03/22/1990 | WO1990002878A2 Electronically controlled cryopump |
| 03/22/1990 | DE3832037A1 Method for the control of machines in a composite system |
| 03/15/1990 | DE3830196A1 Method for using phase-gating controllers as frequency converters |
| 03/15/1990 | DE3830164A1 Method for rotational speed measurement on electric motors |
| 03/13/1990 | US4907406 Combined gas turbine plant |
| 03/08/1990 | WO1990002256A1 Guide vane assembly for auxiliary power unit |
| 03/08/1990 | DE3828608A1 Vacuum-pump device |
| 03/07/1990 | CN2054099U Regulating valve for intake of changing wind rate fan |
| 03/06/1990 | US4905511 Fan assembly and a method for checking the function thereof |
| 02/28/1990 | CN2053692U Tilting device for fan with adjustable tilting angle |
| 02/28/1990 | CN2053689U Head-tilting ceiling fan |
| 02/21/1990 | CN2053271U Integral telecontrolled ceiling fan |
| 02/21/1990 | CN2053270U Timing telecontroller of natural wind for ceiling fan |
| 02/21/1990 | CN2053269U Gentle ceiling fan with adjustable wind rate |
| 02/21/1990 | CN2053268U Adjusting apparatus of oscillating angle for fan |
| 02/21/1990 | CN2053267U Miniature fan with mechanical oriented device and starter |
| 02/21/1990 | CN1039881A Multifunctional hanging fan governor |
| 02/13/1990 | US4900232 Compressor surge control method |
| 02/13/1990 | US4899740 Respirator system for use with a hood or face mask |
| 02/07/1990 | CN2052454U Univeral adjusting device for tilting head of electric fan |
| 01/31/1990 | EP0352938A2 Breathing apparatus |
| 01/31/1990 | EP0352469A2 Method and apparatus for determining surge conditions in a compressor |
| 01/31/1990 | CN2052077U Small-sized fan capable of diffusing fragrance |
| 01/24/1990 | CN1039087A Device for extending performance of radial compressor |
| 01/17/1990 | EP0350750A1 Temperature activated cooling fan assembly |
| 01/17/1990 | CN2051302U Maximum oscillating-angle adjusting device of electric fan |
| 01/17/1990 | CN2051301U Oscillating-angle adjusting device of electric fan |
| 01/17/1990 | CN2051300U Temperature-control circulating timer for electric fan |
| 01/16/1990 | US4894782 Diagnostic system for determining engine start bleed strap failure |
| 01/10/1990 | CN2050894U Micro controller for gust of wind |
| 01/09/1990 | CA1264364A1 Automatic anti-surge control for dual centrifugal compressor system |
| 01/03/1990 | EP0348674A1 Device for extending the surge margin of a radial compressor |
| 12/13/1989 | CN2049289U Socket for simulating natural wind by electric fan |
| 12/13/1989 | CN2049288U Remote control governor for electric fan |
| 12/13/1989 | CN2049287U Gentle breeze compact type ceiling fan |
| 12/12/1989 | US4886425 Capacity control device of scroll-type fluid compressor |
| 11/30/1989 | WO1989011589A1 Surge protected gas turbine engine for providing variable bleed air flow |
| 11/29/1989 | CN2048531U Electronic remote speed controller for fan |
| 11/29/1989 | CN2048530U Sleeping wind controller for fan |
| 11/29/1989 | CN2048527U Cold and warm fan with ultralow speed |
| 11/23/1989 | EP0342928A2 Cooling fan controlling apparatus for a vehicle with an air conditioner |
| 11/22/1989 | CN2048136U Devices of stepless adjusting angle for pendular head of electric fan |
| 11/22/1989 | CN2048135U Automatic controller of fan of changing of gas in indoor |
| 11/15/1989 | CN2047735U Directly-oscillating fan oscillator |
| 11/09/1989 | DE3810693A1 Method and control device for controlling the rotation speed of electric motors |
| 11/08/1989 | CN2047318U Unit combined change-speed switch of ceiling fan |
| 11/08/1989 | CN2047317U Natural wind simulator |
| 10/25/1989 | CN2046561U Natural gentle breeze generator for thermal controlled electric fan |
| 10/25/1989 | CN2046559U Stepless speed regulating gentle breeze electric fan |
| 10/11/1989 | EP0336095A2 Control method to prevent surge of a centrifugal compressor by means of venting by need |
| 10/11/1989 | EP0336092A2 Method to protect a centrifugal compressor against surge by venting via a vent valve and system to realize the method |
| 10/10/1989 | US4872807 Static pressure system for gas turbine engines |
| 10/04/1989 | EP0335105A2 Method to prevent surge of a centrifugal compressor by vent control |
| 10/03/1989 | US4870826 Casing for a turbojet engine combustion chamber |
| 09/28/1989 | DE3908492A1 Fan |
| 09/27/1989 | EP0334034A2 Control method to prevent surge of a centrifugal compressor |
| 09/27/1989 | CN2045032U Speed regulator of ceiling fan and socket energy-saving controller |
| 09/26/1989 | CA1261428A1 Flow rate control system in fluid supply and drain apparatus |
| 09/20/1989 | EP0332888A2 Method for the safe operation of turbo compressors |
| 09/20/1989 | CN1035748A Device for regulating lightness of pendent lamp and speed of pendent fan |
| 09/19/1989 | US4868437 Temperature activated cooling fan assembly |
| 09/13/1989 | EP0331902A2 Diffuser for a centrifugal compressor |
| 09/13/1989 | CN2044293U Adjustor for swing angle of electric fan |
| 09/12/1989 | US4865068 Bleed control apparatus for a fluid conveying system |
| 09/12/1989 | US4864813 Control system for a gas turbine engine |
| 09/06/1989 | CN2044014U A.c. breeze electric fan |
| 09/06/1989 | CN2044013U Electric fan controlled by temp. |
| 08/30/1989 | CN2043681U Automatic speed-regulator for controlling the temp. of the electric fan |
| 08/29/1989 | US4861233 Compressor surge control system |
| 08/24/1989 | DE3804745A1 Cooling system for internal combustion engines |
| 08/23/1989 | EP0328729A2 Method and system to control centrifugal compressors |
| 08/22/1989 | US4859140 Centrifugal fan |
| 08/15/1989 | US4856274 Method and apparatus for evaluating the working line characteristics of a compressor of a gas turbine engine |
| 08/09/1989 | CN2042525U Natural-wind simulating electric fan |
| 07/05/1989 | CN2040604U Temp. controller for kitchen exhaust equipment |
| 07/05/1989 | CN2040556U Wind-controlling gentle and natural breeze electricity-saving governor for electric fans |
| 07/04/1989 | CA1256835A1 Method and apparatus for controlling a multicompressor station |
| 06/28/1989 | CN2040186U Electric-fan capable of simulating natural wind |
| 06/21/1989 | CN2039761U Swin-angle regulator for fan |
| 06/14/1989 | CN2039362U Switch for bidirectional scavenger fan |
| 06/14/1989 | CN2039361U Energy economizer for electric fan |
| 06/14/1989 | CN2039360U Refrigerator compressor driven by duplex-winding motor |
| 06/13/1989 | US4838020 Turbocompressor system and method for controlling the same |