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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 |
| 7748308 | Pneumatic biasing of a linear actuator and implementations thereof An improved method and apparatus are provided for constructing and operating a linear actuator, and equipment incorporating a linear actuator, by operatively connecting a pressure biasing pneumatic arrangement between the driving member and the driven member of a me... | 07/06/2010 |
| 7308949 | Concrete drill A concrete drill for drilling concrete or the like by a diamond bit (5) attached to a front end of a bit drive shaft (4) projected forward from a main body (1) by driving to rotate the bit drive shaft (4) by a drive source (2) cont... | 12/18/2007 |
| 6668988 | Buffering mechanism A buffering mechanism comprises a block member which is installed detachably in an actuator body, a piston which compresses air in a compressing chamber when a movable element abuts against the piston, and a check valve and a variable throttle valve which... | 12/30/2003 |
| 6397727 | Actuator for pivot chuck A pivot-chuck actuator has a housing extending along an axis, a piston chamber centered on the axis, and a vane chamber offset and separate from the piston chamber. A piston is axially displaceable in the piston chamber and axially fixed to a shaft extend... | 06/04/2002 |
| 6116139 | Pneumatically powered linear actuator control apparatus and method A combination drive and method for applying power through a piston rod (A) operated by an air cylinder (B) is controlled by an elongated self-locking threaded drive member (C) rotated by an electric motor (D) for affording positioning and velocity control... | 09/12/2000 |
| 5960693 | Control apparatus for pneumatically operated extensible member and method Control apparatus and method for applying power to a linear actuator (A) utilizes an air cylinder (B) and a self-locking drive (C) rotated by an electric motor (D) for affording positioning and velocity control for the air operated cylinder and the guided... | 10/05/1999 |
| 5806402 | Regulated speed linear actuator In a linear actuator, a cylinder is separated into forward and reverse chambers by a piston. A lead screw is threadedly engaged in the piston and a piston rod connects to the load. A turbine applies torque to the screw to urge the screw toward clockwise o... | 09/15/1998 |
| 5577433 | Regulated speed linear actuator In a linear actuator, a cylinder is separated into forward and reverse chambers by a piston. A lead screw is threadedly engaged in the piston and a piston rod connects to the load. A turbine applies torque to the screw to urge the screw toward clockwise o... | 11/26/1996 |
| 5542335 | Hydraulic assist propulsion apparatus for vehicle drive The field of the invention is one in which an electric motor drives a helically grooved shaft to displace a hydraulic fluid pumping piston to feed the hydraulic fluid under pressure through a flow directing and control system to energize the motion of a p... | 08/06/1996 |
| 5406877 | Steering/lifting appliance A steering/lifting appliance (10) for a hydraulic or pneumatic axle compensation appliance configured as a two-circuit system, having a first external jacket tube (12), a second jacket tube (15) inserted in a pressure-tight manner in the first jacket tube... | 04/18/1995 |
| 5367943 | Rotary-linear unit A rotary-linear unit from whose front end the operative section of a output drive part projects. This output drive part is drivingly connected both with a linear drive and with an oscillating vane motor. The oscillating vane motor is associated with the r... | 11/29/1994 |
| 5232328 | Robot loadable centrifugal semiconductor processor with extendible rotor A processor for centrifugal processing of semiconductor wafers and similar units. The processor is specially constructed to provide an automatically extendible and retractable rotor head to allow automated loading and unloading of wafers. The processor in... | 08/03/1993 |
| 5099749 | Compound motion fluid actuating device and method A rotary/linear fluid actuator includes a cylinder closed at one end by a rotary actuator and at its other end by a forward housing. A piston is disposed in the cylinder. A hollow piston rod, the forward end of which is closed, extends out of the cylinder... | 03/31/1992 |
| 4653381 | Motor suspension apparatus for hydromotors A motor suspension apparatus for a hydromotor of the radial-symmetrical type, characterized by an arm which, in operation, is substantially horizontal, and one end of which is adapted for attachment to the hydromotor and the other end of which is pivotall... | 03/31/1987 |
| 4526087 | Control mechanism for a tridimensional cam A cylinder (3) is positioned to rotate on a fixed axle (1) in such a way that several leakproof chambers (3B, 3D) are formed: a second, longer cylinder (4) is positioned to slide along the first (3) and to turn on the fixed axle (1) in such a way that sev... | 07/02/1985 |
| 4493245 | Rotary and linear actuating device A rotary and linear actuating device is disclosed for imparting precision rotary and linear movement to an external member or assembly. In a preferred form of the invention a rotatable assembly is rotated about an axis within a housing by selectively vary... | 01/15/1985 |
| 4458764 | Device in rock or earth drilling apparatus for rotary drilling A device in rock or earth drilling apparatus for rotary drilling including an axially stationary chuck (21) and an axially movable chuck (27) which is rotated by a reversible pressure fluid driven rotary motor (32) having a pressure fluid supply conduit f... | 07/10/1984 |
| 4430923 | Wrist mechanism in an industrial robot A wrist mechanism in an industrial robot comprises a wrist, a rotary type actuator which is rotatable in clockwise and counter-clockwise directions, a first positioning board which can define arbitrary angular stopping positions, sensing devices, and a se... | 02/14/1984 |
| 4398682 | Displacement mechanism A displacement mechanism for effecting both rotary movement of a movable member (for example a fin) with respect to a fixed member (for example a flight vehicle body) from a first, inoperative position to a second, operative position about a longitudinal ... | 08/16/1983 |
| 4242053 | Free piston fluid energy transfer device The specification describes a fluid energy transfer device, comprising: a body means having at least one fluid chamber and fluid inlet and outlet passages for delivering fluid to and from the chamber; means for continuously accelerating the body means; wh... | 12/30/1980 |
| 4214445 | Hydraulic circuitry for raise drill apparatus A hydraulic system for a drilling apparatus where torque is transmitted to drill pipe, a plurality of thrust cylinders move the torque transmitter back and forth along the drill pipe axis, and a hydraulic motor supplies torque to the torque transmitter, i... | 07/29/1980 |
| 4169404 | Fluid pressure actuator A fluid pressure actuator having a first member, a second member adapted to rotate relative to the first member, and a third member adapted to move on the second member. One of the first member and the second member is formed thereon with two flanges disp... | 10/02/1979 |
| 4139336 | Expansible chamber apparatus with pairs of cylindrical rollers An apparatus having an alternately expanding and contracting chamber comprises at least one pair of cylindrical rollers each having an exterior surface in continuous rolling engagement with the surface of the other roller of the pair, the rollers being ro... | 02/13/1979 |
| 3974706 | Lead screw coupling assembly A coupling assembly for coupling a threaded connection of a lead screw to apparatus to be linearly reciprocated thereby. The coupling does not allow any relative movement of the apparatus and threaded connection in directions parallel to the direction of ... | 08/17/1976 |
| 3948145 | Fluid control mechanism This invention relates to a fluid control system adapted to be used in a rock or roof drill to control the drill feed rate automatically with respect to the resistance of the strata material to drill penetration. The system comprises a priority flow divid... | 04/06/1976 |
