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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7484527 | Switch valve device The present invention relates to a switching valve device used for vacuum suction of a member such as a semiconductor chip, and the object thereof is to break a vacuum rapidly and smoothly. The switching valve device includes a vacuum suction switching valve functio... | 02/03/2009 |
| 7370669 | Electromagnetic valve Disclosed is an electromagnetic valve in which a force due to a working fluid from an inflow hole acting perpendicularly with respect to the axis of a shut-off valve is reduced to thereby reduce the sliding resistance of the shut-off valve. An electromagnetic valve ... | 05/13/2008 |
| 7367355 | Twin manifold seat valve having solenoid actuation A twin manifold seat valve comprising at least two closure members S1, S2, S3 each functionally associated with at least one valve seat D1, D2, D3, D4. At least one of the closure members is moved to a blocking positi... | 05/06/2008 |
| 7270142 | Inflation device with automatic disconnect An apparatus that injects fluid into an inflatable device, dynamically monitors the pressure inside the device, and automatically terminates the inflation and disconnects from the inflatable device when the pressure inside the device reaches a predetermined value pr... | 09/18/2007 |
| 7264019 | Controlled-flow hydraulic distributor The hydraulic distributor exhibits a cylindrical and internally-hollow body (2) having an inlet chamber (3) for a fluid and an outlet chamber (4) which are interconnected directly (by a communication conduit), or indirectly by an external distri... | 09/04/2007 |
| 7255257 | Pneumatically operated power tool having mechanism for changing compressed air pressure A pneumatically operated power tool such as a screw driver, a nail gun and an impact wrench those being driven by a pneumatic pressure. A pressure reduction valve is provided between a connector connected to a compressor and a compressed air chamber defined in an ou... | 08/14/2007 |
| 7229063 | Pressure control valve The invention concerns a pressure control valve for the control of the value of pressure in a hydraulic circuit, especially in a hydraulic circuit of a vehicle transmission, with a valve housing, with a solenoid coil, with an armature component group comprising an a... | 06/12/2007 |
| 7182353 | Turn brake for multi-track vehicles A turn brake includes a cylinder assembly coupled to a conventional front-wheel steering system of a multi-track vehicle. The cylinder assembly generates fluid power for applying differential braking force to left and right wheels of the vehicle in response to turni... | 02/27/2007 |
| 7159615 | Flow control valve A flow rate control valve comprising a valve body having an input port, an output port and an exhaust port, a valve means that is arranged in the valve body and controls the communication of the ports, and an electromagnetic operation means for driving the valve mea... | 01/09/2007 |
| 6959728 | Rotary cam valve A multiple fluid flow controller valve device having radially disposed a number of valves and a central rotary shaft with cam surfaces functioning as the valve controller to open and close the valves in the desired sequence. ... | 11/01/2005 |
| 6959740 | Integrated automobile fluid servicing apparatus A fluid servicing apparatus for exchanging fluids with a power steering fluid reservoir including drain and supply conduits with inline pumps coupled to a control board on a cabinet housing new and used fluid receptacles and a remote pump actuator in communication w... | 11/01/2005 |
| 6907902 | Hydraulic signal output device The present invention intends to provide a hydraulic signal output device having a smaller installation space, and thereby enabling to make an installation space of hydraulic machines in an operation room smaller and that of other than the hydraulic machines larger.... | 06/21/2005 |
| 6907946 | Brake system for a tracked vehicle A direct braking of a drive shaft for a tracked vehicle that moves on rotating track(s). A disc brake is connected to the same drive shaft that has sprocket(s) for engaging the track(s). Upon activation by a vehicle driver, opposing pistons engage the disc to retard... | 06/21/2005 |
| 6789574 | Pneumatic control assembly with simplified direction control valve A pneumatic control assembly includes a valve forming a bore that is openably blocked by a spring-biased, first plug. An inner rod is movable in the bore with a lower end engageable with the first blockage plug and an upper end forming a second plug. The inner rod i... | 09/14/2004 |
| 6431209 | Multi-pressure ball-poppet control valve A high-pressure primary fluid control valve and a multi-pressure selector fluid control valve are disclosed for operating a fluid-actuated device. Preferably a spherical ball-poppet and frusto-conical valve seat adapted for substantially line-contact ther... | 08/13/2002 |
| 6412884 | Solenoid-controlled valve A solenoid-controlled valve has first and second valve bodies axially movably provided in a bore of a cylinder. A first spring is interposed between an end of th valve and the first valve body, a second spring is interposed between the two valve bodies, a... | 07/02/2002 |
| 6192929 | Hydraulic controller The present invention provides a hydraulic controller comprising: a plurality of switching spools; a plurality of cylinder ports of a switching valve; a compressed oil passage common to the switching valves having an intermediate chambers, at least a chec... | 02/27/2001 |
| 6125886 | Pilot valve In order to obtain great damper effects with a comparatively simple structure and fully control a hunting phenomenon, a pilot valve comprises push rods attached to a valve body, spools attached to spools holes of the valve body, spring bearing members pro... | 10/03/2000 |
| 5983942 | Damper of hydraulic pilot valve A damper for a hydraulic pilot valve having a valve body in which a plurality of pressure reducing valves, a rotational shaft, an operation member attached to the rotational shaft and a handling member rotating the rotational shaft are provided. The press... | 11/16/1999 |
| 5918631 | Ball-poppet pneumatic control valve A pneumatic fluid control valve includes a valve body having a fluid inlet connectable to an external source of pressurized pneumatic working fluid, one or more load outlets, one or more corresponding exhaust ports, and a movable valve mechanism. The mova... | 07/06/1999 |
| 5878647 | Pilot solenoid control valve and hydraulic control system using same A pilot operated control valve has a housing defining an inlet and an outlet. A main valve poppet selectively engages a valve seat to control flow of fluid between the inlet and outlet. An aperture in the main valve poppet opens into a control chamber on ... | 03/09/1999 |
| 5845680 | Damper of hydraulic pilot valve A damper for a hydraulic pilot valve having a valve body in which a plurality of pressure reducing valves, a rotational shaft, an operation member attached to the rotational shaft and a handling member rotating the rotational shaft are provided. The press... | 12/08/1998 |
| 5823227 | Hydraulic pilot valve A hydraulic pilot valve, including a plurality of pressure reduction valve portions, each having an inlet port, an outlet port and a pressure regulating valve for establishing and blocking communication between both ports by movement of the pressure regul... | 10/20/1998 |
| 5819800 | Hydraulic pilot valve A hydraulic pilot valve includes a valve body, first, second, third and fourth pressure reduction valves formed in the valve body and respectively having, outlet ports, inlet ports and spools for establishing and blocking communication between the ports, ... | 10/13/1998 |
| 5683071 | Apparatus for controlling selectively engageable detents in a pilot controller A pilot hydraulic system controller including a pilot controller valve for controlling the flow of hydraulic fluid to actuate a primary hydraulic system valve, a pilot controller lockout valve, and a detent control circuit for selectively energizing a det... | 11/04/1997 |
| 5660247 | Rack servo-steering, particularly for motor vehicles In a servo-steering unit provided for motor vehicles, one pinion (2) supported in a steering housing (1) meshes with a rack (6). A steering valve (8) which serves to control the pressurized fluid for the servo-steering unit has two inlet seat valves (10, ... | 08/26/1997 |
| 5615704 | Push Button Pendant for a hoist or winch A modular compact push button pendant for a hoist or winch is assembled of modular component parts along common passageways selectively ported by gaskets, seal plates, and spool valve stems directly operated by push buttons assembled in a straight line pa... | 04/01/1997 |
| 5566716 | Hydraulic control valve A hydraulically operated control valve with a cam member that pivots toward one or the other side of the neutral position in response to an operating member. A pair of push rods each with a piston interposed between the cam member and one of a pair of spo... | 10/22/1996 |
| 5558127 | Hydraulic pilot valve A hydraulic pilot valve consisting of a pair of pressure-reducing valves, wherein a stopper which can freely adjust maximum control inputs of operating levers (23, 24) of the hydraulic pilot valve is provided to make maximum pilot pressures output from th... | 09/24/1996 |
| 5544538 | Hydraulic controller for automatic transmission having automatic manual control and automatic failsafe operation A vehicular automatic transmission (AT) hydraulic controller has an integrated valve. The integrated valve has a cylindrical cam shaft including convex and concave parts on the outer periphery thereof, and the integrated valve is connected to a motor for ... | 08/13/1996 |
| 5482085 | Pilot pressure sub-assembly for fluid control valve A fluid control valve includes a spring biased pilot pressure sub-assembly for adjustably setting an initial step pressure. The sub-assembly includes a spring seat and an axially movable spool. The spool includes a body portion having a threaded outer sur... | 01/09/1996 |
| 5454400 | Zero leakage directional control valve A fluid directional control valve has at least one working fluid control port and a pressure inlet controlled with respect thereto by a poppet valve where zero leakage sealing is achieved by provision of a poppet seat which combines a resilient seal porti... | 10/03/1995 |
| 5433249 | Hydraulic pilot valve A crosswise controllable pilot valve for generating a pilot pressure corresponding to an amount of operation of a control lever. This valve has a spool reciprocable within a valve case between a pilot pressure supplying position for interconnecting a pump... | 07/18/1995 |
| 5251660 | Hydraulic pilot valve unit A hydraulic pilot valve unit constructed with an aim of controlling the flow rate of fluid under pressure in proportion to the stroke of the operating lever, irrespective of the speed of operation of the lever, and adapted for use in supply of pilot fluid... | 10/12/1993 |
| 5209263 | Pilot valve assembly A reliable pilot valve assembly having a control lever is produced at low cost while installed without requiring any additional switch and wiring and piping work. The assembly has a main valve body (1). A spool (27) is slidably mounted in the body (1) so ... | 05/11/1993 |
| 5174333 | Output pressure control apparatus An output pressure control apparatus particularly adapted for HVAC control applications, and being of the general type which admits a higher supply pressure to a controlled output line when it is desired to increase the pressure in the output line and whi... | 12/29/1992 |
| 5152142 | Negative load control and energy utilizing system Compensated controls for a negative type load which, without degrading the quality of the control, permit direct use of the fluid power energy of the negative load for control of a resistive or positive type load, thereby greatly increasing the efficiency... | 10/06/1992 |
| 5092362 | On-off valves and pressure regulators for high-pressure fluids A fast-actuating on-off valve and pressure regulator particularly well-suited for use with high-pressure incompressible fluids. An actuator, manually-operated or powered, provides a linear push-pull force to a valve stem assembly mounted inside a valve ca... | 03/03/1992 |
| 5044256 | Exhaust pressurizing control for a fluid system Fluid systems having fluid motors which control aiding type loads many times have problems with cavitation in one end of the fluid type motor during lowering thereof. It is desirable to eliminate all cavitation in the fluid motor during operation. In orde... | 09/03/1991 |
| 4836234 | Electrically operated fluid control valve An electrically operated fluid control valve provides a controlled output pressure proportional to an electrical control signal. The valve housing has a pressure control chamber, an inlet passageway leading from an inlet port to the chamber, an outlet por... | 06/06/1989 |
