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| Number | Title | Issue Date |
| 6709241 | Apparatus and method for controlling a pump system A controller for controlling operating parameters associated with fluid flow, speed or pressure for a centrifugal pump for pumping fluid, wherein at least one sensor is coupled to the pump for generating a signal indicative of a sensed operating condition. The contr... | 03/23/2004 |
| 6705839 | Control system and method for air compressor In a device and a method for controlling an oiled air compressor (1), which is included in a compressed-air system (2) for a motor vehicle and which is driven by the engine (3) of the motor vehicle and supplies compressed air to at least one con... | 03/16/2004 |
| 6685438 | Apparatus and method for controlling operation of reciprocating compressor In an operation control apparatus of a compressor, a current, a voltage an d a TDC, etc. applied to a compressor are detected, a speed and a TDC are constantly controlled so as to place an operation point of the compressor within a high efficiency operati... | 02/03/2004 |
| 6676383 | Method and a pump apparatus for the generation of an adjustable, substantially constant volume flow of a fluid and a use of this method A method and a pump apparatus are provided for the generation of an adjustable, substantially constant volume flow of a fluid by means of a pump apparatus, wherein the fluid (5) is forwarded by the pump apparatus (1) from a reservoir (2) into a flow conne... | 01/13/2004 |
| 6672069 | Method and device for increasing the pressure of a gas A method in which an air mass flow supplied to a compressor in a power plant is divided in a flow divider into a small partial flow and into a larger partial flow. The smaller partial flow is supplied to an ejector via an air cooler and a booster. The lar... | 01/06/2004 |
| 6672850 | Torque control oil pump with low parasitic loss and rapid pressure transient response A torque control crescent oil pump, having low parasitic loss and rapid pressure transient response, and a method for controlling oil flow within the pump, are provided. In one embodiment, the crescent oil pump comprises a housing, toothed annular gears c... | 01/06/2004 |
| 6669448 | Pump control method and apparatus A method for controlling the operation of one or more electrically-operated pumps (11, 12) to pump a liquid from a well or sump (10) which, in use, receives a substantially continuous inflow of said liquid, characterized in that the method includes the st... | 12/30/2003 |
| 6666664 | Technique for protecting a submersible motor A motor protection system that utilizes a motor protector in combination with a submersible motor. The motor protector allows for the free flow of an internal lubricating liquid therethrough to the connected submersible motor. The internal liquid prevents... | 12/23/2003 |
| 6666655 | Hydraulic pump nozzle and method of use A hydraulic flow return system of a transmission pump in which primary and bypass flows of hydraulic fluid are returned to primary and bypass flow channels, respectively, of a booster nozzle situated adjacent the rotating group at the inlet of the pump fo... | 12/23/2003 |
| 6663351 | Piezoelectric actuated elastic membrane for a compressor and method for controlling the same A compressor includes a cylinder block having a compression chamber therein, a piston arranged in the compression chamber which reciprocates up and down, and a driving mechanism which drives the piston. The driving mechanism includes an elastic member who... | 12/16/2003 |
| 6663350 | Self generating lift cryogenic pump for mobile LNG fuel supply system A high pressure pump and delivery system mating to LNG storage and suited for natural gas powered trucks and buses, but also suitable for other cryogenic liquid fuels. The reciprocating pump is comprised of a liquid pumping portion and a vapor compressing... | 12/16/2003 |
| 6659730 | High pressure pump system for supplying a cryogenic fluid from a storage tank A method and apparatus is provided for supplying both cryogenic liquid and vapor from a storage tank to a pump to reduce the need for venting. The pump is operable to pump cryogenic liquid or a mixture of liquid and vapor. Different operating modes are se... | 12/09/2003 |
| 6659729 | Screw compressor equipment for accommodating low compression ratio and pressure variation and the operation method thereof The invention provides a method of operating a screw compressor equipment without reducing the efficiency, in which a screw compressor 1 of which the internal volume ratio is variable by means of an internal volume ratio control valve is driven by a drivi... | 12/09/2003 |
| 6655924 | Peristaltic bubble pump A pump comprises a chamber with an inlet and an outlet. A first heating element is located in proximity with the inlet, and a second heating element is located in proximity with the outlet. The first and second heating elements are configured when heated ... | 12/02/2003 |
| 6652241 | Method and compressor module for compressing a gas stream The invention relates to a method and compressor module for compressing a gas stream of entry temperature t1 with the aid of hydraulically driven piston compressors in two compression stages of an entry pressure p1 from an intermedia... | 11/25/2003 |
| 6652239 | Motor controller for a hydraulic pump with electrical regeneration Disclosure is made of a precision hydraulic energy delivery system that directly couples the pump to a primary mover (motor) and a related motor control. The system provides flow control of a hydraulically driven machine without the use of downstream devi... | 11/25/2003 |
| 6652240 | Method and control system for controlling multiple throttled inlet rotary screw compressors A more efficient compressor control system and a more efficient method of operating a multiple throttled inlet rotary screw compressor system includes the method and control system which are a function of both the actual system pressure and volumetric flo... | 11/25/2003 |
| 6648606 | Centrifugal pump performance degradation detection A method for determining whether a centrifugal pump is degraded as operating outside of acceptable operating limits and includes the steps of determining a motor torque/TDH relationship over a range of speeds for minimum and maximum flow rates and at leas... | 11/18/2003 |
| 6648605 | Pump utilizing dissimilar materials to compensate for temperature change A pump includes a pump housing that defines an inlet and an outlet. Within the pump housing, there is a barrel that is adjacent to at least one reciprocating piston. A sleeve surrounds the annular outer surface of the piston and is movable. The temperatur... | 11/18/2003 |
| 6648604 | Short reverse rotation of scroll compressor at startup In a method of operating a scroll compressor at startup, the compressor is rotated in reverse for a brief period of time. The compressor is of a type which does not compress liquid when rotated in reverse. The purpose is to boil off the liquid refrigerant... | 11/18/2003 |
| 6648603 | Pressure washer engine idle controller An engine idle controller for an engine driven pressure washer. The pressure washer delivers high pressure water from a pump through the idle controller to a conventional wand which includes a manually operated, normally closed flow control valve and a sp... | 11/18/2003 |
| 6644933 | Water pump with electronically controlled viscous coupling drive An electronically-controlled viscous coupling is coupled to a water pump to control the coolant flow rate of engine coolant to an engine at a given engine speed to maximize fuel economy and minimize emissions. The viscous coupling has a stationary electri... | 11/11/2003 |
| 6644930 | Method and arrangement for pumping a material using a dual chamber pump system A pumping method and arrangement, in which at least two chamber pumps (A, B) are operated in order to achieve a constant output flow. In the pumping procedure and arrangement, the entry chamber (110, 130) of the chamber pump is pre-pressurised close to th... | 11/11/2003 |
| 6641368 | Compressor utilizing low volt power tapped from high volt power Low voltage electrical power is supplied to a diagnostic control device in a sealed compressor. Electrical power is tapped from a high voltage power line and transformed to low voltage power that in turn operates the diagnostic control device. The diagnos... | 11/04/2003 |
| 6640687 | Control system for hydrostatic pump A non-feedback proportional system is provided to achieve desired operating characteristics which will allow the control of a hydrostatic transmission to closely approximate the control performance of a displacement feedback control system by establishing... | 11/04/2003 |
| 6638025 | Method and apparatus for controlling a fluid actuated system The present invention relates to an improved fluid actuated system, such as those used in hydraulically actuated fuel injectors of an internal combustion engine. A fluid pump supplies hydraulic fluid to a high pressure rail that in turn supplies the fuel ... | 10/28/2003 |
| 6638024 | Hydraulic air compressor system--employing a body of fluid to provide compression A gas compression system including a body of fluid and a down pipe. A first end of the down pipe is positioned to receive a fluid from a source above a surface of the body of fluid and a second end is positioned at a lower level of the body of fluid. A ga... | 10/28/2003 |
| 6635183 | Apparatus and methods for pumping high viscosity fluids A system for dispensing and filtering fluid is disclosed, in which the fluid flow path is substantially vertical from the fluid inlet through fluid dispense. Substantially all wetted surfaces are Teflon.RTM. or some similar non-contaminating fluid, for ap... | 10/21/2003 |
| 6632072 | Pneumatic pump control system and method of making the same including a pneumatic pressure accumulator tube A pneumatic pump control system for sequentially switching on and off an electrically operated pump disposed in a waste water liquid storage tank The pneumatic pump control system comprises a pneumatic pressure accumulator that is disposed within the liqu... | 10/14/2003 |
| 6631617 | Two stage hermetic carbon dioxide compressor A two stage hermetic compressor which uses carbon dioxide as the working fluid. A pair of modules individually housing compression mechanisms are located at opposite ends of a module housing an electric motor. The modules are secured to one another when t... | 10/14/2003 |
| 6629820 | Microfluidic flow control device A method of controlling fluid flow in a channel in a microfluidic flow control device by introducing fluid to the channel, with the fluid flowing in a flow direction and controllably deforming material defining the channel in a direction perpendicular to ... | 10/07/2003 |
| 6623247 | Method and apparatus for controlling a variable displacement hydraulic pump A method and apparatus for controlling a variable displacement hydraulic pump having a swashplate pivotally attached to the pump. The method and apparatus includes determining a desired swashplate angle as a function of a power limit of the pump, determin... | 09/23/2003 |
| 6623246 | Apparatus and method for controlling operation of linear motor compressor An apparatus and a method for controlling operation of a linear motor compressor, by which a linear motor compressor can operate always in an optimum condition by coping with the load variation due to changes in a refrigerator and the circumstances. In mo... | 09/23/2003 |
| 6623245 | Pump and pump control circuit apparatus and method A method and apparatus for a pump and a pump control system. The apparatus includes pistons integrally formed in a diaphragm and coupled to the diaphragm by convolutes. The convolutes have a bottom surface angled with respect to a top surface of the pisto... | 09/23/2003 |
| 6619926 | Cam and crank engagement for a reversible, variable displacement compressor and a method of operation therefor A reversible reciprocating piston compressor includes a crankcase defining at least one cylinder therein and a crankshaft rotatably supported by the crankcase. The crankshaft includes a drive portion and a crankpin eccentrically positioned relative to an ... | 09/16/2003 |
| 6616416 | Methods and system for motor optimization using capacitance and/or voltage adjustments A system and method for controlling a variable capacity compressor driven by a motor. Preferably, said system and method are used with a reversible, two-stage compressor motor. In one embodiment, the method includes, for example, operating the variable ca... | 09/09/2003 |
| 6609895 | Carbon dioxide pump, pumping system, and method of controlling the same There is disclosed a pump and pumping system for pumping dense phase gases, specifically for injecting carbon dioxide into an oil or gas reservoir that includes a pump, a motor, and a casing in which the pump and motor reside. There is also disclosed a pu... | 08/26/2003 |
| 6607362 | Micro paddle wheel pump for precise pumping, mixing, dispensing, and valving of blood and reagents An apparatus and method for making a microscopic paddle wheel coupled inductively by an external electromagnet and used for valving and active pumping so that the actual pumping mechanism is completely isolated from the electromagnetic driver. The paddle ... | 08/19/2003 |
| 6607361 | Pumping method and device The invention relates to a method for the metered, pulsed pumping of fluid media under high pressure, in which a pressure surge resulting from the stored, kinetic energy of an electromagnetically driven armature element of a reciprocating pump is transmit... | 08/19/2003 |
| 6604911 | Method for regulating a fan in a compressor unit and compressor unit with fan regulated in such manner A method for regulating a fan in a compressor unit which having at least one compressor element, a motor connected to the compressor element, and a cooler including at least one radiator and a fan cooperating therewith; driven by a motor. The motor of the... | 08/12/2003 |
