Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 7524173 | Method for assembling a modular fluid end for duplex pumps A fluid end for a duplex mud pump. In one implementation, the fluid end includes two liner blocks, each having a central passage. The fluid end further includes two fluid inlets disposed on a side portion and two fluid outlets disposed on a top portion and a suction... | 04/28/2009 |
| 7357782 | Connector device An adapter for use in connecting a vacuum source with a breast shield is disclosed including a housing with at least one female coupling component formed therein, at least one male coupling component that is adapted to attach to a tube at one end for conveying press... | 04/15/2008 |
| 7354256 | Fluid end for duplex pumps A fluid end for a duplex mud pump. In one implementation, the fluid end includes two liner blocks, each having a central passage. The fluid end further includes two fluid inlets disposed on a side portion and two fluid outlets disposed on a top portion and a suction... | 04/08/2008 |
| 7326184 | Connector device An adapter for use in connecting a vacuum source with a breast shield is disclosed including a housing with at least one female coupling component formed therein, at least one male coupling component that is adapted to attach to a tube at one end for conveying press... | 02/05/2008 |
| 7278836 | Metering pump A metering pump that is capable of delivering a constant, rate of fluid over a wide range of viscosities at infinitely variable delivery rates. Two identical pumping chambers are provided with one operating in the suction mode, and the other in the discharge mode wi... | 10/09/2007 |
| 6752064 | Fluid pressure powered motor A radial, fluid pressure actuated motor having sets of opposed axially aligned cylinders arranged in a spaced relation about a crankshaft, each set of cylinders having a common push rod extending between them. Each push rod has a central Scotch yoke with an elongate... | 06/22/2004 |
| 6264442 | High volume positive displacement pump with gear driven rotary valves A positive displacement pump for gases includes a pair of pistons operating out of phase. Each of the pistons is associated with a plurality of rotary inlet valves disposed along the sidewalls of the piston cylinders. A rotary outlet valve is also associa... | 07/24/2001 |
| 6200111 | Controllable high volume positive displacement pump A controllable positive displacement pump for liquids and gases which may contain dispersed phase particles includes a pair of pistons operating out of phase. Each of the pistons is associated with an inlet valve which includes a fixed grating defining sl... | 03/13/2001 |
| 6168398 | Piston pump having lifting valves with a convex surface A piston pump comprising at least one working space, which is surrounded by a cylinder and which is adapted to be varied by a piston arranged in said cylinder, and at least one inlet valve as well as at least one outlet valve, said valves being lifting va... | 01/02/2001 |
| 6113367 | Oil-less/oil-free air brake compressor with a dual piston arrangement A cylinder is divided into two chambers by a wall to receive a pair of pistons. This reduces the stroke length and correspondingly reduces the linear speed of the piston. This leads to a reduced PV factor associated with degradation and wear of the piston... | 09/05/2000 |
| 6092995 | High precision pump for medical and chemical analyzers A high accuracy and high precision pump for fluids, specifically for use in chemical and/or medical analyzers includes a female-thread or nut inside the motor rotor shaft and a male-thread or lead screw mated with the female-thread or nut supported by a b... | 07/25/2000 |
| 5954484 | Sewage lifting station A sewage lifting station having at least two solid waste collection chambers for receiving pumped solid waste-contaminated sewage. The station has a collection tank for receiving pre-treated waste water flowing from the solid waste collection chambers via... | 09/21/1999 |
| 5549453 | Reciprocating-piston-type compressor having piston entering discharge chamber A reciprocating piston type compressor for compressing refrigerant gas includes a cylinder block with a plurality of parallel cylinder bores arranged around the longitudinal axis of the cylinder block, the cylinder bores having bore ends as discharge port... | 08/27/1996 |
| 5479847 | Dual-piston pump apparatus A dual-piston pump apparatus includes a pair of reciprocating sleeves within which a pair of reciprocating pistons are disposed. The pistons and sleeves are each supported on a frame for independent reciprocating movement along a line angled relative to h... | 01/02/1996 |
| 5163822 | Radial piston pump A radial piston pump has a pump body with two pump chambers lying in a straight line. In the pump chambers pistons reciprocate along this same straight line. The pump pistons are coupled to an actuator which is rotatable about an axis which bisects the st... | 11/17/1992 |
| 4792287 | Wobble driven axial piston pump An axial piston pump for pumping a medium such as a viscous liquid in which a wobble element is set into rotating movement via a piston, the wobble element moving at least one feed piston in a piston bore. The piston bore is intended to communicate, via a... | 12/20/1988 |
| 4730545 | Axial piston machine having a plurality of mechanically actuated rotary valves An axial piston device with a plurality of mechanically actuated, rotory valves having their front faces sealing for the control of flows of fluid is suggested for the connection of ports of its housing to ingoing and outgoing passages of a combustion eng... | 03/15/1988 |
| 4629400 | Hydraulic pump with pistons and controlled suction valves A hydraulic pump comprising at least a reciprocating piston, each piston being associated with one suction valve returned to its closing position by a return spring. The return spring is associated on the one hand with the valve and on the other hand with... | 12/16/1986 |
| 4486152 | Pump with spring loaded valve A hydraulic pump having spring loaded valves utilizes a spring providing a constant spring force and a spring providing a varying spring force. The varying spring force depending upon the position of the pump piston. The pump suction valve opens after a v... | 12/04/1984 |
| 4345883 | High pressure pumping apparatus for semi-fluid material Concrete is transmitted from a hopper forming a part of a mobile concrete pumping apparatus to the deposit site through a flow line having a Y-pipe inlet. The pumping apparatus includes two piston-cylinder concrete pumps mounted in side-by-side relationsh... | 08/24/1982 |
| 4065230 | Reciprocating infusion pump and directional adapter set for use therewith A reciprocating infusion pump is presented having a pair of syringes activated by individual actuating cylinders. The actuating cylinders are interconnected with a hydraulic fluid, and the cylinders and alternately pneumatically actuated whereby the cylin... | 12/27/1977 |
