| Patents for F15B 9 - Servomotors with follow-up action, i.e. in which the position of the actuated member conforms with that of the controlling member (1,862) |
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| 01/11/1991 | CA2020139A1 Power transmission |
| 01/09/1991 | CN2069048U Hollow pretightening device for oil cylinder |
| 12/27/1990 | CA1278360C Load sensing circuit of load compensated direction control valve |
| 12/26/1990 | CN1010968B Servo system |
| 12/18/1990 | US4977816 Hydraulic motor control system with rotating servo-valve |
| 12/11/1990 | CA1277694C Reaction mechanism for a tandem brake booster |
| 11/21/1990 | CN1047135A 高分辨率脉冲宽度调制 High-resolution pulse width modulation |
| 11/21/1990 | CN1010510B Power transmission |
| 11/15/1990 | WO1990013747A1 Hydraulic drive |
| 11/14/1990 | EP0279837B1 Hydraulic idling-regulating valve |
| 10/30/1990 | US4967124 Servo control apparatus |
| 10/24/1990 | EP0393650A2 High resolution pulse width modulation |
| 10/24/1990 | EP0393345A2 Hydraulic control device |
| 10/03/1990 | EP0296104B1 Hydraulic linear servo amplifier |
| 08/28/1990 | US4951549 Digital servo valve system |
| 08/14/1990 | US4947732 Electro-hydraulic servo actuator with function for adjusting rigidity |
| 08/08/1990 | EP0381361A1 Multiplex control systems |
| 08/07/1990 | CA1272518A1 Power transmission |
| 07/25/1990 | CN1008932B Digital pulse-valve system |
| 07/18/1990 | CN1043980A Multi-port self-regulating proportional pressure control valve |
| 07/10/1990 | US4939981 Hydraulic servo cylinder device for controlling continuously variable speed transmission |
| 07/04/1990 | EP0376440A1 Multi-port self-regulating proportional pressure control valve |
| 06/28/1990 | WO1990007063A1 Digital servo valve system |
| 06/27/1990 | EP0301007A4 Servovalve drive electronics improvements. |
| 06/20/1990 | CN2058434U Hydraulic servo linear oil cylinder for robot |
| 06/13/1990 | CN1008391B Power transmission |
| 06/12/1990 | CA2005253A1 Digital servo valve system |
| 05/15/1990 | US4924754 Circuit arrangement for a hydraulic drive in a position control circuit |
| 05/03/1990 | DE3836401A1 Hydraulic linear drive |
| 04/25/1990 | CN1007756B Power transmission |
| 04/10/1990 | CA1267585A1 Valve control system |
| 03/13/1990 | US4907493 Valve control system for hitch motor |
| 03/13/1990 | US4907492 Apertured valve disposed in hollow piston rod of follower-type motor |
| 03/13/1990 | US4907435 System for monitoring the position of a machine component |
| 03/06/1990 | US4905572 Hydraulic directional valve for an aircraft control |
| 02/28/1990 | EP0356133A2 Servo control apparatus |
| 02/27/1990 | US4903578 Electropneumatic rotary actuator having proportional fluid valving |
| 02/20/1990 | US4901627 Hydraulic idling-regulating valve |
| 02/20/1990 | US4901624 Hydraulic driving device |
| 01/10/1990 | EP0349723A1 Electropneumatic rotary actuator having proportional fluid valving |
| 01/08/1990 | EP0297106A4 Load sensing circuit and electrohydraulic control for load compensated directional control valve. |
| 12/13/1989 | CN1006084B Machinery location feedback hydraulic low-speed servo mechanics |
| 12/12/1989 | US4887214 Flight control system employing two dual controllers operating a dual actuator |
| 11/28/1989 | US4883091 Multi-port self-regulating proportional pressure control valve |
| 11/23/1989 | EP0342461A2 Triggering device with redundant controllers for a valve actuated by an electric motor |
| 11/22/1989 | CN1037379A Means for adjusting angle of pitch of blade or blades of wind-powered generator |
| 11/07/1989 | US4878417 Method and apparatus for servo-controlling the position of a pneumatic actuator |
| 11/01/1989 | CN1005656B Pulsewidth modulating method and fluid valve controlling system |
| 10/31/1989 | US4878005 Servo system |
| 10/25/1989 | EP0338036A1 Linear actuator with hydraulic amplification |
| 10/11/1989 | EP0336887A1 Pressure fluid servo amplifier |
| 10/11/1989 | EP0177876B1 Linear drive |
| 10/03/1989 | US4870892 Control means for a hydraulic servomotor |
| 09/26/1989 | CA1259783A1 Servo system method and apparatus, servo valve apparatus therefor and method of making same |
| 09/12/1989 | US4864915 Vacuum operated actuator |
| 09/05/1989 | US4862788 Valve positioning device |
| 08/29/1989 | US4860634 Arrangement for controlling the travel of two hydraulic cylinders |
| 08/16/1989 | EP0198055B1 System for monitoring the position of a machine component |
| 08/08/1989 | US4855659 Electropneumatic position regulator |
| 07/26/1989 | EP0220248B1 Device for adjusting the circuit amplification of a servo-regulating circuit |
| 06/28/1989 | EP0321758A2 Electro-hydraulic actuator system |
| 06/20/1989 | US4840111 Energy-conserving regenerative-flow valves for hydraulic servomotors |
| 06/20/1989 | CA1255996A1 Servo system method and apparatus, servo valve apparatus therefor and method of making same |
| 06/07/1989 | CN1033310A Linear gearing with hydaulic amplification |
| 06/06/1989 | CA1255154A1 Pumping unit drive system |
| 05/05/1989 | WO1989003939A1 Linear drive with hydraulic reinforcement |
| 05/03/1989 | EP0313899A2 Flight control system employing two dual controllers operating a dual actuator |
| 05/02/1989 | US4825754 Vane-type rotary hydraulic actuator device intended for driving an aircraft control surface |
| 05/02/1989 | US4825745 Electrohydraulic control system |
| 05/02/1989 | CA1253415A1 Combined servo control and jack unit |
| 03/09/1989 | EP0303595A4 Linear position sensor. |
| 02/28/1989 | US4807517 Electro-hydraulic proportional actuator |
| 02/22/1989 | EP0303595A1 Linear position sensor. |
| 02/14/1989 | US4804913 Positioning control system for a fluid powered cylinder |
| 02/01/1989 | EP0301007A1 Servovalve drive electronics improvements |
| 01/19/1989 | DE3721693A1 Electrohydraulic actuator |
| 01/04/1989 | EP0297106A1 Load sensing circuit and electrohydraulic control for load compensated directional control valve. |
| 01/03/1989 | US4794845 Direct drive rotary servo valve |
| 12/28/1988 | CA1247720A Power transmission |
| 12/21/1988 | EP0296104A1 Hydraulic linear servo amplifier |
| 12/13/1988 | US4790511 Hydraulic apparatus, in particular a 2-way proportional throttle valve |
| 12/13/1988 | US4790234 Fluidic power-assisted setting device |
| 11/30/1988 | EP0293321A2 Apparatus for controlling a fluid-pressure differential cylinder actuator |
| 11/29/1988 | US4788483 Parallel redundant actuator systems |
| 11/01/1988 | US4781103 Fluid servomechanism |
| 10/25/1988 | US4779837 Remote control poppet valve |
| 10/25/1988 | US4779512 Rotary drive spool valve |
| 10/19/1988 | EP0286722A1 Electropneumatic position controller |
| 10/04/1988 | CA1242781A1 Power transmission |
| 09/27/1988 | US4774651 Power transmission |
| 09/13/1988 | US4770081 Servomechanism with idle gear feedback |
| 09/07/1988 | EP0280980A1 Electrohydraulic Servo system |
| 09/01/1988 | DE3644429A1 Electrohydraulic control cylinder |
| 08/31/1988 | EP0279837A1 Hydraulic idling-regulating valve. |
| 08/17/1988 | EP0144439B1 Fluid servo actuator |
| 07/26/1988 | US4759258 Fluid powered actuator system |
| 07/26/1988 | CA1239683A1 Power transmission |
| 07/20/1988 | EP0274833A2 Fluid powered servo system |
| 07/19/1988 | US4757747 Power transmission |
| 07/19/1988 | US4757745 Microwave antenna and dielectric property change frequency compensation system in electrohydraulic servo with piston position control |