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Class Information
Number: 91/388
Name: Motors: expansible chamber type > Working member position feedback to motive fluid control > Fluid operated
Description: Apparatus in which means responsive to fluid pressure is connected to operate or modify the operation of the valve means by fluid pressure variations created in response to the position of the working member.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8485087 Fluid distributor apparatus and punching method Jul. 16, 2013
6471025 Actuating device for the actuation, in particular pneumatic actuation, of a friction clutch Oct. 29, 2002
6416033 Air over hydraulics actuator system Jul. 9, 2002
6240353 Industrial vehicle May. 29, 2001
6116399 Friction clutch for a motor vehicle and an operation device for the operation, especially pneumatic operation, of a friction clutch Sep. 12, 2000
5673558 Hydraulic circuit system for hydraulic excavator Oct. 7, 1997
5339723 Pressurized fluid actuation system for amplifying operator input force in a surgical instrument Aug. 23, 1994
5079988 Hydraulic sensor and transducing apparatus Jan. 14, 1992
4933617 Servo steering system for motor boats Jun. 12, 1990
4862788 Valve positioning device Sep. 5, 1989
4827830 Chassis towveyor cart May. 9, 1989
4766801 Hydraulically operated power steering system Aug. 30, 1988
RE32588 Valve actuator system Feb. 2, 1988
4688469 Fault detector for a triplexed mechanical or hydromechanical system Aug. 25, 1987
4647004 Pneumatic-hydraulic actuator system Mar. 3, 1987
4637474 Tractor and towed implement with elevation control system for implement including pressure responsive valve actuator Jan. 20, 1987
4632016 Apparatus for controlling an adjustable arm Dec. 30, 1986
4622883 Apparatus for positioning a movable member Nov. 18, 1986
4574687 Apparatus for positioning an adjusting member Mar. 11, 1986
4519296 Control-circuit throttle valve May. 28, 1985
4518146 Valve operator control system May. 21, 1985
4510847 Apparatus for adjusting the position of an adjustable element Apr. 16, 1985
4509404 Master/slave fluid pressure apparatus Apr. 9, 1985
4508008 Hydraulic brake booster Apr. 2, 1985
4463660 Multi-way valve Aug. 7, 1984
4463658 Arrangement for controlling the lifting mechanism of a tractor or a harvester combine Aug. 7, 1984
4421012 Control circuit throttling valve Dec. 20, 1983
4354555 Hydraulic lifting arrangement for implements, especially on tractors Oct. 19, 1982
4350078 Apparatus for restricting the velocity of a hydraulic piston in its end positions Sep. 21, 1982
4335645 Fluidic repeater Jun. 22, 1982
4335867 Pneumatic-hydraulic actuator system Jun. 22, 1982
4271749 Reduced back pressure, anti-cavitation valve system Jun. 9, 1981
4265331 Fluidic repeater May. 5, 1981
4263838 Pneumatic positioner Apr. 28, 1981
4256015 Fluidic stabilization control Mar. 17, 1981
4254689 Fluidic repeater Mar. 10, 1981
4253603 Temperature responsive control apparatus Mar. 3, 1981
4227440 Fluidic repeater Oct. 14, 1980
4227441 Hydraulic servo-motor for a regulating valve having a hydraulic closing mechanism Oct. 14, 1980
4215844 Valve actuator system Aug. 5, 1980
4205590 Positive feedback mechanism for servocontroller of fluid operated actuator Jun. 3, 1980
4161905 Hydraulic servomechanism Jul. 24, 1979
4152971 Fluidic repeater May. 8, 1979
4137825 Fluidic repeater Feb. 6, 1979
4094229 Fluidic repeater Jun. 13, 1978
4091716 Fluidic servo-system and method May. 30, 1978
4088087 Remote control apparatus marine vessels having dual propeller shafts May. 9, 1978
4071108 Steering system for articulated vehicles Jan. 31, 1978
4046059 Fluidic repeater Sep. 6, 1977
4044651 Pneumatic function generator assembly Aug. 30, 1977

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