| Patents for F15B 21 - Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass (10,959) |
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| 02/26/1992 | CN2097311U Self-sealed magnetic joint for filtering oil |
| 02/19/1992 | EP0471044A1 Extensible hose for reducing pressure pulses. |
| 02/05/1992 | EP0469641A2 Method of controlling a fluid-powered actuator |
| 01/29/1992 | EP0468571A1 Hydraulically propelled pneumatically returned valve actuator |
| 01/25/1992 | CA2047448A1 Hydraulically propelled pneumatically returned valve actuator |
| 01/22/1992 | CN2093921U Back-stroke speed-regulating oil disc of single-rod electro-hydraulic thruster |
| 01/21/1992 | US5081737 Apparatus for eliminating deposits of floating fibers |
| 01/08/1992 | CN2092622U Shock absorber for hydraulic pipelines |
| 01/05/1992 | CA2020371A1 Multi-sprinkler controller |
| 01/02/1992 | EP0276253B1 Pulse jet fabric filter |
| 01/01/1992 | CN2091984U Siphon-type liquid pulser |
| 12/26/1991 | WO1991019908A1 Electrohydraulic control apparatus and method |
| 12/17/1991 | US5072584 Hydraulic drive with fluid cooling by-pass line |
| 11/19/1991 | CA1292130C Sensor-controlled hydraulic system with electroviscous fluids |
| 11/13/1991 | EP0456397A1 Sequential remote control plug release system for wells |
| 11/12/1991 | US5063966 Direct drive servovalve having bearing filter |
| 11/12/1991 | CA1291922C Pressure-referenced programmed flow control in a hydraulic valve |
| 10/31/1991 | DE4034666A1 Hydraulically actuated lift - has counterbalance weights raised and lowered by second hydraulic cylinder |
| 10/22/1991 | US5058538 Hydraulically propelled phneumatically returned valve actuator |
| 10/22/1991 | US5058484 Electrohydraulic control arrangement for controlling a hydraulic drive |
| 10/17/1991 | DE4011913A1 Hydraulic system with filter - separates out fine particles by channelling part of flow through by=pass line |
| 10/15/1991 | US5056312 Hydraulic drive system for construction machines |
| 10/15/1991 | CA1290643C Automatic pressurized reservoir bleed valve |
| 10/02/1991 | EP0448874A1 Electrorheological fluid apparatus |
| 10/02/1991 | EP0448716A1 Teaching/playback method of working machine |
| 09/24/1991 | US5051116 Method of reducing pressure drop during the passage of a fluid, and a hydraulic system reservoir for circulation of a fluid |
| 09/19/1991 | WO1991013790A1 Extensible hose for reducing pressure pulses |
| 09/18/1991 | EP0446757A1 Hydraulic system to supply a variable displacement pump |
| 09/17/1991 | US5048644 Method for improving the performance of a motor controlled hydraulic elevator |
| 09/10/1991 | US5046312 Swivel speed control circuit for working vehicle |
| 09/03/1991 | US5044256 Exhaust pressurizing control for a fluid system |
| 09/03/1991 | CA1288315C Temperature compensated control valve, particular for hydraulic control systems for motor vehicles |
| 08/22/1991 | DE4004482A1 Periodically regeneration compressed air dryer in pneumatic system - by valve controlled air passage venting compressed air directly to atmos. via dryer |
| 08/21/1991 | CN2083210U Portable hydraulic oil filter |
| 08/21/1991 | CN2083209U Oil radiator for loaders |
| 08/20/1991 | US5040603 Sequential remote control plug release system |
| 08/14/1991 | EP0441514A1 Time-control circuit for pneumatically operable devices |
| 08/14/1991 | EP0440802A1 Device for controlling hydraulic pump |
| 08/13/1991 | US5038894 Drive control apparatus |
| 08/13/1991 | US5038563 Seawater power source for seawater powered tools |
| 08/07/1991 | EP0439805A2 Oil-cooling device for hydraulic drive systems of a plastic material injection-moulding machine |
| 07/31/1991 | EP0439433A1 Pneumatic spool valve |
| 07/31/1991 | CN2081913U Multi-filtering and double-rotating type oil tank steered with car power |
| 07/31/1991 | CN2081912U Oil filtering and unloading unit for manual hydraulic fork lift |
| 07/25/1991 | WO1991010834A1 Pneumatic time-switched actuator device |
| 07/24/1991 | CN1013292B Hydraulic pulse generator |
| 07/09/1991 | US5029514 Nozzle hydraulic actuator ring with cooling flow |
| 07/09/1991 | CA1285850C Control of the actuation of hydraulic consumers |
| 07/09/1991 | CA1285835C Pneumatic stepping actuator positioner |
| 07/03/1991 | CN2080114U Electric remote control stepless pressure adjusting device |
| 07/02/1991 | US5029067 Operation control device |
| 06/19/1991 | EP0432156A1 A method of reducing pressure drop during the passage of a fluid, and a hydraulic system reservoir for circulation of a fluid. |
| 06/13/1991 | DE4002739C1 Appts. for cooling oil in hydraulic drive unit - includes two coaxial guide tubes for oils, cooling tube in annular chamber filter insert etc. |
| 06/04/1991 | US5020766 Sound and vibration damper |
| 06/04/1991 | US5020324 Charge flow priority circuit |
| 05/29/1991 | CN2077922U Hydraulic oil-return-throttling-speed regulating return passage with unadjustable damper |
| 05/28/1991 | US5019257 Parallel filtering circuit with conduits of different rates |
| 05/14/1991 | US5014823 Apparatus for improving the performance of a motor-controlled hydraulic elevator |
| 05/09/1991 | WO1991007596A1 Device for improvement of running condition in hydraulic system |
| 05/09/1991 | CA2073000A1 Device for improvement of running condition in hydraulic system |
| 05/08/1991 | CN2076439U Combined oil filter outside box |
| 05/02/1991 | DE3935756A1 Hydraulic circuit for vehicle - with integral leakage path for automatic venting for secondary forward-reverse pump |
| 03/26/1991 | US5001901 Hydraulic fluid circuit for full case hydraulic unit |
| 03/20/1991 | EP0417657A1 Method of controlling hydraulic actuator |
| 03/20/1991 | EP0417087A1 Electrohydraulic guide system. |
| 03/14/1991 | DE3930553A1 Lifting mechanism hydraulic control system - has pressure-equalisers for flow to and from pressure accumulator |
| 02/21/1991 | WO1991002167A1 Device for controlling hydraulic pump |
| 02/21/1991 | DE3926846A1 Piston slide valve for water hydraulics - makes use of ceramic for piston and housing bush |
| 02/06/1991 | EP0410995A1 Apparatus for flushing of hydraulic pipe systems or the like. |
| 01/31/1991 | DE4021292A1 Hydraulic oil filter combined with pressure regulator - in one unit also has non-return valve smoothing peak pressures |
| 01/23/1991 | CN2069941U Vibration-proof backpressure valve |
| 01/08/1991 | CA1278733C Operating system for a tree harvester |
| 01/02/1991 | CA1278494C Load responsive control system adapted to use of negative load pressure in operation of system controls |
| 01/01/1991 | US4981286 Apparatus using a fluid whose viscosity varies with electric current applied thereto |
| 12/27/1990 | CA1278360C Load sensing circuit of load compensated direction control valve |
| 12/26/1990 | CN1010969B Controlling system for load-transducing hydraulic circuit |
| 12/19/1990 | EP0403210A2 Hydrostatic drive system |
| 12/13/1990 | DE3918555A1 Hydraulic circuit oil temp. control - uses shutter valve in by=pass which closes at high oil temp. to direct oil through cooler |
| 12/13/1990 | DE3918119A1 Operating arrangement for linear motor(s) esp. for dispenser - contains controller acting as pump or drive motor depending on line pressure w.r.t. working pressure |
| 12/12/1990 | CN1047724A Power transmission |
| 12/12/1990 | CA2014905A1 Warm-up control for transmission hydrostatic unit |
| 11/28/1990 | EP0399044A1 Hydraulic servo valve |
| 11/28/1990 | CN2066527U Hydraulic oil pumping throttling speed adjusting loop with nonadjustable damper |
| 11/28/1990 | CN1010607B Direction controlling valve with hydraulic pilot valve |
| 11/27/1990 | US4972762 Warm-up circuit for hydraulic pilot control system |
| 11/22/1990 | DE3916539A1 Movement and pressure transmission unit - with substitution of elastomer for gas liquid |
| 11/14/1990 | CN1010377B Pulse jet fabric filter |
| 11/06/1990 | US4967557 Control system for load-sensing hydraulic drive circuit |
| 10/31/1990 | EP0395453A2 Electrode for electroviscous fluid |
| 10/31/1990 | DE4014175A1 Cooling system for oil pump - makes use of common drive shaft for pump and blower |
| 10/31/1990 | CN1010244B Hydraulic pulsetor |
| 10/30/1990 | US4966065 Multiplexed hydraulic control systems |
| 10/24/1990 | EP0393697A2 Electrohydraulic system |
| 10/17/1990 | CN2063993U Electric intelligent performer |
| 09/11/1990 | US4955194 Damping arrangement for damping the oscillations of valve controlled by pressure fluid |
| 09/05/1990 | CN1009480B Hydaulic device for engineering mechanism |
| 08/28/1990 | US4951466 Warm-up control for transmission hydrostatic unit |
| 08/21/1990 | US4949805 Electrically controlled auxiliary hydraulic system for a skid steer loader |
| 08/09/1990 | WO1990008454A2 A method with 3 medium quantities, 2 in the same direction, control piston cylinder applications |
| 08/08/1990 | EP0381198A1 Apparatus using a fluid whose viscosity varies with electric current applied thereto |