Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7357792 | Positive push medical valve with internal seal A medical valve having an open mode to permit fluid flow and a closed mode to prevent fluid flow has a body and a valving element within the interior of the body. The body also has a valving element within its interior, and a proximal port and a distal port. The val... | 04/15/2008 |
| 7322802 | Thick matter pump comprising a conveyance capacity control system A thick matter pump comprising a drive motor (50), a (reversible) hydraulic pump (6), and two hydraulic cylinders (5, 5′) coupled to conveyor cylinders (7, 7′) for conveying the thick matter. A regulator regulates the rotational speed... | 01/29/2008 |
| 7178592 | Closed loop multiphase underbalanced drilling process The present invention provides apparatus and methods for handling fluids returning from a well. The fluids are introduced into a separator and a separated gas stream is recovered or recycled. The gas stream may comprise more than one phase. The separated gas stream ... | 02/20/2007 |
| 7175394 | Hydraulic multiphase pump The present invention provides a hydraulically driven multiphase pump system and methods for pumping a fluidstream from the surface of a well. The hydraulically driven multiphase pump system consists of two vertically disposed plungers. The plungers are hydraulicall... | 02/13/2007 |
| 7163359 | Device for conveying powder and method for operating the same Transport system with several devices (1) for transporting powder, where each device (1) has a transfer chamber (3) into which a supply line (6) and a discharge line (8) for the powder open, and means to generate a negative pressur... | 01/16/2007 |
| 7107776 | Air conditioning system for vehicle An air conditioning system includes a primary or engine-driven compressor that is driven by a primary driving source or engine, and a secondary or motor-driven compressor that is driven by a secondary driving source or motor. The air conditioning system increases in... | 09/19/2006 |
| 7100890 | Swabbable luer-activated valve A normally closed valve that may be opened upon insertion of a nozzle permits two-way flow when opened by a luer-taper nozzle. The valve also is able to resist large back pressures. The valve includes a substantially rigid housing that defines a passageway having an... | 09/05/2006 |
| 7040417 | Drilling systems The present invention discloses, in certain aspects, systems and methods for producing cyclical impacts and, in certain aspects for moving a drilling apparatus for drilling a borehole in a formation, the system in certain embodiments including a housing with a longi... | 05/09/2006 |
| 7014169 | Anti-drawback medical valve A medical valve has a translating member that enlarges the volume of the interior of the valve when the valve is in an open mode (permitting fluid flow), and decreases the volume of the interior when the valve is in a closed mode (preventing fluid flow). This varyin... | 03/21/2006 |
| 6986303 | Displacement shift valve and pumping apparatus and methods using such a valve Apparatus and methods are provided for pumping concrete using a pumping apparatus including first and second drive cylinders, a valve, and a pump. Fluid is delivered into the cylinders from the pump to reciprocate pistons within the cylinders. Pressure within the cy... | 01/17/2006 |
| 6973798 | Air conditioning system for vehicle An air conditioning system 1 includes a primary compressor (an engine-driven compressor 6) driven by a primary driving source (an engine 2) and a secondary compressor (a motor-driven compressor 7) driven by a secondary driving source (a m... | 12/13/2005 |
| 6929454 | Thick matter pump In a thick matter pump, especially for delivering concrete, comprising two delivery cylinders, it is known to provide two position sensors in one of the two cylinders for control of the pistons. However, leakage of hydraulic fluid can lead to an imbalance of the two... | 08/16/2005 |
| 6920940 | Hitch device for attaching farm implements to a tractor A farm implement of a tractor is hitched to two lift arms, each of which is moved by a respective actuating cylinder having two chambers connected to a feed circuit supplying a pressurized fluid; the feed circuit having, for each chamber, two feed lines for feeding ... | 07/26/2005 |
| 6904982 | Subsea mud pump and control system A sub-sea mud pump system includes a plurality of pump units, and each pumping unit includes a plurality of pumping elements. Each pumping element includes a pressure vessel with a first and a second chamber, a separating member between the first and second chambers... | 06/14/2005 |
| 6609898 | Process and device for pumping compressible materials with reduced pressure pulsation A hydraulic system for a reciprocating piston pump that includes an accumulator for producing a steady-pressure supply of compressible material to a distribution nozzle. The hydraulic system includes an adjustable means for constricting the flow of hydrau... | 08/26/2003 |
| 6454542 | Hydraulic cylinder powered double acting duplex piston pump A mud pump is provided with two cylinders for pumping mud in connection with water well drilling, and two sets of hydraulic oil cylinders with pistons connected to and driving the pistons of the mud pump by piston rod connecting plates. A flow divider loc... | 09/24/2002 |
| 6299416 | Bulk material pump device A bulk material pump device includes first and second hydraulic drive cylinders capable of causing alternate reciprocating movement of the corresponding pumping pistons to pump concrete contained in a hopper through a transportation conduit. The first dri... | 10/09/2001 |
| 6210131 | Fluid intensifier having a double acting power chamber with interconnected signal rods A fluid driven reciprocating apparatus having a double acting power chamber with signal rods serving as high pressure pistons, or to transmit mechanical power. The signal rods are connected to a double acting piston in the power chamber thereby eliminatin... | 04/03/2001 |
| 6171075 | Process and device for controlling a two-cylinder thick medium pump The invention relates to a sequential control system for two-cylinder thick medium pumps whose delivery cylinders (1, 1') are actuated hydraulically by two drive cylinders (5, 5') in opposing cycles. A pipe shunt (3) is provided inside a material feed con... | 01/09/2001 |
| 6126413 | Apparatus for use in liquid circulation system and method for using said apparatus The invention relates to an apparatus for use in a liquid circulation system of the kind comprising a primary circulatory circuit provided with a circulation pump and having a primary forward flow and a primary return flow, as well as a secondary circulat... | 10/03/2000 |
| 5660532 | Multiphase piston-type pumping system and applications of this system A multiphase piston-type pumping system including a feed line (13) for the fluid to be pumped and a discharge line (19) for the pumped fluid, with at least one first variable-volume chamber (2) designed for pumping, the fluid, and with chamber being defin... | 08/26/1997 |
| 5634779 | Hydraulic fluid-driven, multicylinder, modular reciprocating piston pump A hydraulic fluid-driven, multicylinder, modular, reciprocating piston pumping machine of non pulsating flow and independently variable forward and return stroke speeds comprises several pumping modules (A, B . . . E) each having one primary cylinder (A1,... | 06/03/1997 |
| 5616009 | Mud pump A multicylinder, double acting improved mud pump is disclosed. The preferred embodiment incorporates a hydraulic powered piston in a cylinder which connects with a piston rod which, in turn, drives a second piston in a cylinder adapted to pump fluid mud. ... | 04/01/1997 |
| 5616005 | Fluid driven recipricating apparatus An apparatus comprising a pair of fluid driven pump assemblies in a back-to-back configuration to yield a bi-directional pump. Each of the pump assemblies includes a piston or diaphragm which divides a chamber therein to define a power section and a pumpi... | 04/01/1997 |
| 5344290 | Method and device for controlling a double-cylinder thick matter pump A method and device for controlling a thick matter pump having two feed cylinders, each coupled to a material feed tank and including a drive piston for pumping thick matter through the respective feed cylinder. Each drive piston is driven within a respec... | 09/06/1994 |
| 5213478 | Slurry pumping method and apparatus A slurry pumping method and an apparatus to deliver slurry waste from factories to a filter press for solid-liquid separation. In this apparatus, a pair of laterally or vertically arranged diaphragm type pumping devices are activated by hydraulic cylinder... | 05/25/1993 |
| 5209649 | Control system for a two-cylinder thick matter pump A two cylinder thick matter pump has two hydraulic drive cylinders, two pistons supported and driven within each respective drive cylinder, and two feed cylinders. Each feed cylinder is adapted to receive a respective piston therein to pump the matter the... | 05/11/1993 |
| 5114319 | Concrete-pumping device Concrete-pumping device comprising a frame, a number of pump cylinders mounted on the frame which comprise a pump opening close to one end, sealed pump pistons which are guided slidably in the pump cylinders toward and away from the pumping device and whi... | 05/19/1992 |
| 5092522 | Automated accurate mix application system for fiber reinforced structures Processes and apparatus for the construction of improved tank structures employing a pump metering and delivery system which accurately meters, mixes and evenly applies composite materials to form the walls of tanks or containment vessels. Such systems ha... | 03/03/1992 |
| 5066203 | Apparatus for pneumatically discharging concrete In an apparatus for pneumatically discharging concrete fed hydromechanically in a dense stream, using for the hydromechanical feed a concrete pump having a hydraulic drive comprising at least two cylinders with opposed pistons, said pump having synchroniz... | 11/19/1991 |
| 5024584 | Pump unit with adjustable piston stroke length A pump unit comprising co-operating, push-pull connected reciprocating pumps for the pumping in portions of contents to packing containers on a packing machine. The reciprocating pumps (1) each comprise a control piston (4) connected to the pump piston (6... | 06/18/1991 |
| 4884747 | Ripple-free flow, accurate mix, and automated spray system An apparatus for the construction of improved tank structures employing a pump metering and delivery system which accurately meters, mixes and evenly sprays composite materials to form the walls of tanks or containment vessels. Such systems have specific ... | 12/05/1989 |
| 4856967 | Hybrid high pressure pump for gas-liquid permeameters A fluid pump for delivering accurate volumes of high-pressure fluids is obtained using an intensifier to supply the majority of the motive power required to displace the fluids. The intensifier balances the forces between the output pressure of the displa... | 08/15/1989 |
| 4790728 | Dual-rigid-hollow-stem actuators in opposite-phase slurry pump drive having variable pumping speed and force A slurry pump has slurry hopper and dual pumping cylinders. The slurry pumping members are driven by opposite-phase actuators. Each actuator has a rigid-hollow-stem partition dividing the space between the actuator plunger and the cylinder into two drive ... | 12/13/1988 |
| 4750869 | Method and apparatus for boosting gas from a low-pressure source to a high-pressure receptacle Method and apparatus for transferring and boosting the pressure of gas from a source to a receptacle by sequentially filling and compressing volumes of gas by displacing same with a fluid available at a higher pressure and utilizing pressure differential ... | 06/14/1988 |
| 4710104 | Variable displacement fluid pump with transducer interface Apparatus for providing a variable supply of water under pressure to an hydraulic ring main pressure fluid circuit in, for example, a coal mine, comprises a reciprocating pump in said ring main and an hydraulic reciprocating motor for driving said pump me... | 12/01/1987 |
| 4690622 | Liquid intensifier unit The unit comprises three liquid intensifiers, coupled together in juxtaposition, and fixed between a pair of plates. A support plate at the one end of the intensifiers mounts a rotary valve which, sequentially, supplies operative, low-pressure fluid to th... | 09/01/1987 |
| 4676724 | Mud pump A multicylinder, improved mud pump is disclosed, the preferred embodiment incorporating a hydraulically powered piston in a cylinder which connects with a piston rod which, in turn, drives a second piston in a cylinder adapted to pump mud. The first pisto... | 06/30/1987 |
| 4621988 | Liquid intensifier unit The unit comprises three liquid intensifiers, coupled together in juxtaposition, and fixed between a pair of plates. A support plate at the one end of the intensifiers mounts a rotary valve which, sequentially, supplies operative, low-pressure fluid to th... | 11/11/1986 |
| 4611973 | Pumping system and method of operating the same Improved mud pump comprised of plural cylinder pumping units, each cylinder unit consisting of a pumping compression chamber and two or more hydraulic driven expansion chambers, with one or more expansion chambers being employed to drive a pumping plunger... | 09/16/1986 |
