| 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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| 08/07/1990 | CA1272518A1 Power transmission |
| 08/01/1990 | EP0380234A1 Multiplexed control systems |
| 08/01/1990 | EP0379595A1 Hydraulic driving apparatus |
| 07/25/1990 | EP0378789A2 Electrohydraulic control system for controlling a hydraulic drive |
| 07/23/1990 | CA2008281A1 Multiplexed hydraulic control systems |
| 06/28/1990 | WO1990007032A1 Teaching/playback method of working machine |
| 06/21/1990 | DE3841369A1 Hydraulic pulse system |
| 06/19/1990 | US4934462 Control device for a dual function machine |
| 05/30/1990 | EP0370892A1 Control device for an earth-moving machine |
| 05/29/1990 | US4928487 Control apparatus for double acting hydraulic cylinder units |
| 05/22/1990 | CA1269302A1 Method and apparatus for eliminating cavitation in hydraulic systems |
| 05/16/1990 | CN1007998B Hydrautic pulse generator |
| 05/09/1990 | EP0366815A1 Hydraulic drive unit for construction machinery |
| 05/08/1990 | US4922716 Throttled exhaust outlet to reservoir for reducing noise resulting from release hydraulic pressure surges |
| 05/02/1990 | CN1041713A Apparatus for flushing of hydraulic pipe system or like |
| 04/25/1990 | EP0238942B1 Sensor-controlled hydraulic system using electroviscous fluids |
| 04/18/1990 | CN1007632B Control system of hydraulic constructional mechanism |
| 04/11/1990 | EP0362206A1 Hydraulic drive. |
| 03/28/1990 | EP0359785A1 Pulsating hydraulic drive system |
| 02/06/1990 | USRE33159 Fluidic oscillator with resonant inertance and dynamic compliance circuit |
| 02/06/1990 | USRE33158 Fluidic oscillator with resonant inertance and dynamic compliance circuit |
| 02/06/1990 | US4898084 Sensor-controlled hydraulic system with electroviscous fluids |
| 02/06/1990 | EP0351402A4 Load responsive control system adapted to use of negative load pressure in operation of system controls. |
| 01/31/1990 | EP0352654A2 Electrically controlled auxiliary hydraulic system for a skid steer loader |
| 01/25/1990 | WO1990000683A1 Hydraulic driving apparatus |
| 01/25/1990 | DE3824332A1 Method of cooling hydraulic fluid in a supply tank and associated cooling arrangement |
| 01/24/1990 | EP0351402A1 Load responsive control system adapted to use of negative load pressure in operation of system controls |
| 01/08/1990 | EP0297106A4 Load sensing circuit and electrohydraulic control for load compensated directional control valve. |
| 12/27/1989 | EP0347872A1 Ventilating device for an oil tank preferably made of plastics |
| 12/27/1989 | EP0209553B1 Hydraulic pulse generator |
| 12/20/1989 | CN1038144A Method for producing pressure pulses in mass of gas and device for performing method |
| 12/20/1989 | CN1006165B Hydraulic controller in underground |
| 12/07/1989 | DE3818264A1 Process and apparatus for controlling a drive cylinder |
| 12/06/1989 | CN2048913U Oil buffer |
| 12/05/1989 | US4884402 Control and regulating device for a hydrostatic drive assembly and method of operating same |
| 11/23/1989 | EP0342863A2 Hydraulic actuator system |
| 11/16/1989 | WO1989011041A1 Hydraulic drive unit for construction machinery |
| 11/08/1989 | CN2047197U Bilateral filter with stop valve |
| 11/02/1989 | WO1989010214A1 Apparatus for flushing of hydraulic pipe systems or the like |
| 11/02/1989 | DE3834201A1 Arrangement for feeding pressure medium to hydraulic consumers |
| 11/01/1989 | CN1005656B Pulsewidth modulating method and fluid valve controlling system |
| 11/01/1989 | CN1005643B Route valve with hydraulic actuation |
| 10/05/1989 | DE3808538A1 Treatment device for compressed air and other media |
| 10/03/1989 | US4870892 Control means for a hydraulic servomotor |
| 10/03/1989 | US4870819 Control device for a hydrostatic drive for at least two actuators |
| 09/27/1989 | CN1035868A Controlling system for load-transducing hydraulic circuit |
| 09/21/1989 | WO1989008783A1 A method of reducing pressure drop during the passage of a fluid, and a hydraulic system reservoir for circulation of a fluid |
| 09/12/1989 | US4864822 Control device for a hydrostatic drive for at least two actuators |
| 09/06/1989 | EP0331662A1 Sound and vibration damping apparatus |
| 09/05/1989 | USRE33043 Air bleeding system for hydraulic closed circuits |
| 08/29/1989 | US4860542 Piston-cylinder pulsator circuit with superplastic alloy pressure transmitting medium |
| 08/29/1989 | CA1258809A1 Fluid operated system control |
| 08/16/1989 | EP0327604A1 Device for preventing the deposit of fly fibre |
| 08/16/1989 | CN2042903U Antipollution high-flow electro-hydraulic servo valve |
| 08/15/1989 | US4856278 Control arrangement for at least two hydraulic consumers fed by at least one pump |
| 08/08/1989 | US4854951 Pulse jet fabric filter |
| 08/02/1989 | EP0326150A1 Control system for load-sensing hydraulic drive circuit |
| 07/19/1989 | EP0324730A1 Apparatus for reducing noise resulting from hydraulic pressure surges |
| 07/18/1989 | US4848390 Switching valve having hydraulic self-holding properties |
| 07/13/1989 | DE3834918A1 Circuit arrangement for controlling a hydraulic drive motor with energy recovery during the braking process |
| 07/06/1989 | DE3836453A1 Valve arrangement for controlling and monitoring the working pressure of a hydraulic consumer |
| 07/05/1989 | EP0020563B2 Motor-valve apparatus for hydraulic fan drive system |
| 06/22/1989 | DE3742198A1 Pulshydraulik-antriebssystem Pulse hydraulic drive system |
| 06/20/1989 | US4840112 Combined valve/cylinder using electro-rheological fluid |
| 06/20/1989 | US4840111 Energy-conserving regenerative-flow valves for hydraulic servomotors |
| 06/15/1989 | WO1989005408A1 Pulsating hydraulic drive system |
| 06/15/1989 | WO1989005407A1 Hydraulic servo valve |
| 06/15/1989 | DE3805290A1 Arrangement for actuating at least one linear motor, in particular for a metering device |
| 06/14/1989 | EP0319594A1 Fluidic oscillator with resonant inertance and dynamic compliance circuit |
| 05/23/1989 | US4832082 Hydraulic pilot operated directional control valve |
| 05/17/1989 | EP0160674B1 Automatic reservoir bleed valve |
| 04/26/1989 | EP0313539A1 A device for neutralizing metal chips in a pressure liquid accumulator |
| 04/18/1989 | US4821517 Multilayer laminated bladder filled with mixtures of freons |
| 04/18/1989 | US4821515 Control device for liquid or gaseous medium |
| 04/12/1989 | CN2035816U Pressured air filter |
| 04/12/1989 | CN1032384A 液压脉冲发生器 Hydraulic pulse generator |
| 04/11/1989 | US4819429 Hydraulical drive system |
| 04/05/1989 | CN2035410U Oil-filter on container for oil suction and back |
| 03/21/1989 | US4813477 Heat exchanger-filter apparatus for hydrostatic system |
| 03/21/1989 | US4813446 Automatic pressurized reservoir bleed valve |
| 03/15/1989 | EP0306632A1 Switch valve |
| 03/15/1989 | CN2034211U Adsorption water knockout air strainer |
| 03/09/1989 | WO1989002033A1 Load responsive control system adapted to use of negative load pressure in operation of system controls |
| 03/08/1989 | CN2033704U Hydraulic filter |
| 02/22/1989 | CN1031271A Hydraulic pulsetor |
| 02/09/1989 | WO1989001065A1 Device for preventing the deposit of fly fibre |
| 02/09/1989 | DE3744718A1 Device for the explosive generation of air blasts |
| 02/01/1989 | EP0301096A1 Operation controller |
| 02/01/1989 | CN2031859U Hydraulic system eliminated hydraulic impaction |
| 01/31/1989 | US4800922 Hydraulically controlled maneuvering device |
| 01/24/1989 | US4799420 Load responsive control system adapted to use of negative load pressure in operation of system controls |
| 01/04/1989 | EP0297106A1 Load sensing circuit and electrohydraulic control for load compensated directional control valve. |
| 01/04/1989 | CN1030024A Parallel filtering circuit |
| 12/21/1988 | EP0295335A2 Parallel filtering circuit |
| 12/21/1988 | CN88219065U Automobile power steering plastic oil tank with double filtering |
| 12/13/1988 | CA1246497A1 Method for feeding hydraulic fluid, both continuously and by means of controlled impulses, to activate a hydraulic lift working normally in a continuous mode, and apparatus forthe implementation of said method |
| 12/01/1988 | WO1988009442A1 Electrohydraulic guide system |
| 11/15/1988 | US4784013 HST system driving apparatus |
| 10/25/1988 | US4780638 Hydraulically-operated mine-roof support |
| 10/20/1988 | DE3711233A1 Antriebseinrichtung mit einer primaerenergiequelle, einem getriebe und einer pumpe Drive means having a primaerenergiequelle, a transmission and a pump |