Patents Represented by Attorney George E. Haas
  • Patent number: 7639861
    Abstract: A method and apparatus is provided for illuminating a wafer during wafer alignment using machine vision. An illumination device is fabricated using electroluminescent material, that provides diffuse illumination uniformly over the surface of the lamp to provide backlighting of the wafer. Contrast between the image of the wafer and the diffuse illumination produce edge features in the image that can be analyzed to determine the position and orientation of the wafer.
    Type: Grant
    Filed: September 14, 2005
    Date of Patent: December 29, 2009
    Assignee: Cognex Technology and Investment Corporation
    Inventors: David J. Michael, John B Boatner, Martin Karnacewicz
  • Patent number: 6834736
    Abstract: A suspension system isolates the operator cab or seat from vibrations in the chassis of a vehicle. At least one hydraulic actuator is connected between the cab or seat and the vehicle chassis. An accumulator is coupled to the hydraulic actuator and acts as a hydraulic spring to attenuate high frequency vibrations. An electrically operable, three-position, closed-center control valve selectively connects the hydraulic actuator to a source of pressurized hydraulic fluid or a reservoir. Sensors detect acceleration and displacement of the cab or seat to which a controller responds by operating the valve. That control of the valve actively drives the hydraulic actuator to produce motion that counters the relatively low frequency vibrations from the chassis.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: December 28, 2004
    Assignee: HUSCO International, Inc.
    Inventors: Bradley James Kramer, Eric Norman Griesbach, Jeffrey A. Rogala
  • Patent number: 6807943
    Abstract: A gasoline direct injection system of an engine has a high pressure pump with an output connected to a fuel rail that supplies a plurality of fuel injectors. A control valve is connected in parallel with the pump to maintain the fuel rail pressure at a consistent level as the fuel injectors open and close. A valve element engages and disengages a seat to control the flow of fuel through the control valve. The high pressure from the fuel supply rail acts on surfaces of the valve element which are designed to produce a force imbalance that serves to rapidly open the control valve. An electromagnetic actuator, that closes the control valve, has a low impedance coil and pole pieces made of soft magnetic composite material to minimize eddy currents that impede valve performance.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: October 26, 2004
    Assignee: Husco International, Inc.
    Inventors: Curtis L. VanWeelden, Kathryn I. Bacon, Michael Layne
  • Patent number: 6793196
    Abstract: A flow control valve is intended for use in a gasoline direct injection system of an engine to maintain the fuel rail pressure at a consistent level as the cylinder injector valves open and close. A valve element moves against and away from a seat to control the flow of fuel through the valve. The high pressure from the fuel supply rail acts on surfaces of the valve which are designed to produce a force imbalance that serves to rapidly open the valve element. The electromagnetic actuator has components fabricated from a soft magnetic composite material which reduce eddy currents that could impede performance of the valve. The electromagnetic actuator is sealed so that that the fuel does not impede movement of the components. A low impedance coil also is used to operate the valve.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: September 21, 2004
    Assignee: Husco International, Inc.
    Inventors: Curtis L. VanWeelden, Kathryn I. Bacon
  • Patent number: 6792637
    Abstract: An apparatus dispenses detergent into a warewasher from a reservoir wherein a flow control device controls the flow of the detergent. A sensor measures the electrical conductivity of water within the warewasher and produces a conductivity measurement. A controller operates the flow control device in a first mode in which the quantity of detergent dispensed into the warewasher is determined in response to the electrical conductivity of the water. If the conductivity measurement is determined to be unreliable, the controller operates in a second mode in which a predefined quantity of detergent is dispensed into the warewasher. The reliability of the conductivity measurement is determined based on the amount that the conductivity changes upon detergent being added to the warewasher.
    Type: Grant
    Filed: January 8, 2002
    Date of Patent: September 21, 2004
    Assignee: U.S. Chemical Corporation
    Inventors: Kurt A. Reichold, David A. Uhen
  • Patent number: 6782852
    Abstract: A hydraulic actuator operates either an intake or an exhaust valve for an engine cylinder. A driver piston is adapted to be operably connected to open and close the engine cylinder valve. An electrically driven operator produces movement of a valve spool which controls flow of fluid to and from the driver piston. A feedback mechanism is coupled to the valve spool and responds to movement of the driver piston by moving the valve spool into a position at which fluid flows neither to nor from the driver piston. The feedback mechanism ensures that the stroke of the hydraulic actuator is proportional to the magnitude of the electric current applied to the operator regardless of variation of the fluid pressure applied to the driver piston.
    Type: Grant
    Filed: October 7, 2002
    Date of Patent: August 31, 2004
    Assignee: Husco International, Inc.
    Inventor: Curtis L. Van Weelden
  • Patent number: 6779685
    Abstract: A carbonated beverage is furnished from a source at a first pressure to a reservoir in which a quantity of the beverage is held a second pressure level that is less than the first pressure and greater than atmospheric pressure. When it is desired to dispense the carbonated beverage into a serving container, the reservoir is vented to the atmosphere so that the beverage is dispensed at substantially atmospheric pressure. The amount of carbonated beverage in the reservoir is sensed and when that amount drops below a first level, carbonated beverage is added from the source while the reservoir is vented to the atmosphere. The venting terminates when the amount of beverage in the reservoir reaches a second level. The beverage continues to flow into the reservoir thereafter for a predefined period of time causing the pressure to increase to the second pressure level.
    Type: Grant
    Filed: December 11, 2002
    Date of Patent: August 24, 2004
    Assignee: Dispensing Systems International, LLC
    Inventor: Patrick L. Nelson
  • Patent number: 6779340
    Abstract: A plurality of hydraulic actuators are connected between a supply line and a tank return line. A separate desired velocity is requested for each hydraulic actuator. In response to a respective metering mode and the desired velocity for each hydraulic actuator, the flow requirements that each hydraulic actuator has from the supply and return lines are derived. A determination is made as to what fractions of the required flows can be provided by the flow levels that are available from the supply and return lines. Those fractions are used to convert the desired velocity for the given hydraulic actuator into a velocity command which indicates the velocity of the given hydraulic actuator that can be achieved with the available fluid flows. The respective velocity command is used to control the flow of fluid to each hydraulic actuator.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: August 24, 2004
    Assignee: HUSCO International, Inc.
    Inventors: Joseph L. Pfaff, Keith A. Tabor
  • Patent number: 6775974
    Abstract: An actuator is part of a hydraulic circuit branch that has a first electrohydraulic proportional valve connecting the actuator to a supply line containing pressurized fluid and a second electrohydraulic proportional valve connecting the actuator to a tank return line. A method for operating the valves includes requesting a desired velocity for the hydraulic actuator and sensing a parameter which varies with changes of a force on the actuator. The desired velocity and the parameter are used to derive an equivalent flow coefficient which characterizes fluid flow in the hydraulic circuit. From the equivalent flow coefficient, first and second valve flow coefficient are derived and then employed to activate each of the first and second electrohydraulic proportional valves. The coefficients may characterize either conductance or restriction in the respective part of the hydraulic system.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: August 17, 2004
    Assignee: HUSCO International, Inc.
    Inventor: Keith A. Tabor
  • Patent number: 6757009
    Abstract: A motor vehicle control system includes a pair of cameras for producing first and second images of a passenger area. A distance processor determines distances that a plurality of features in the first and second images are from the cameras based on the amount that each feature is shifted between the first and second images. An analyzer processed the distances and determine a size of an object on the seat. Additional analysis of the distance also may determine movement of the object and the rate of that movement. The distance information also can be used to recognize predefined patterns in the images and thus identify the object. A mechanism utilizes the determined object characteristics in controlling operation of a device, such as deployment of an air bag.
    Type: Grant
    Filed: June 11, 1997
    Date of Patent: June 29, 2004
    Assignee: Eaton Corporation
    Inventors: Marc R. Simon, Larry Matthies, William J. Janutka, Sabrina Elizabeth Kemeny
  • Patent number: 6745992
    Abstract: A pilot operated valve has a main poppet that selectively controls bidirectional flow of fluid between two ports in response to pressure in a control chamber on one side of the main poppet. The main poppet has a pilot orifice that is opened and closed by a pilot poppet. A unique mechanism is provided to compensate for variation of a pressure differential on opposite sides of the pilot orifice. This mechanism has a pair of annular end members between which extends a spring formed by a plurality of helices. Multiple passages with check valves extend through the main poppet to communicate the greatest pressure among the two ports to the control chamber and the lowest pressure among the two ports to the side of the pilot orifice that is opposite the control chamber.
    Type: Grant
    Filed: August 5, 2002
    Date of Patent: June 8, 2004
    Assignee: Husco International, Inc.
    Inventors: Xiaolong Yang, Michael J. Paik, Joseph L. Pfaff
  • Patent number: 6738920
    Abstract: A plurality of modules are connected in a series and addresses are automatically assigned to the modules upon the application of power. At that time, a module sends a signal to all of the other modules which causes a first timer to be started in each module. After a predefined period, an initial module, at one end of the series, sends a timing signal to the next module in the series. Each module upon receiving a timing signal starts a second timer, delays for the predefined period, and then sends a timing signal to the next module in the series. When terminal module at the opposite end of the series receives a timing signal, that module sends a second signal to all of the modules which causes the modules to stop all of the first and second timers. Each module then uses the values of its respective timers to derive a unique address.
    Type: Grant
    Filed: November 28, 2000
    Date of Patent: May 18, 2004
    Assignee: Eaton Corporation
    Inventor: Arthur P. Horne
  • Patent number: 6732512
    Abstract: A control system for operating a hydraulic system includes a user input device which generates an input signal indicating desired movement of a hydraulic actuator. A mapping routine converts the input signal into a velocity command indicating desired actuator velocity. A valve opening routine transforms the velocity command into a flow coefficient which characterizes fluid flow through the valve assembly and from the flow coefficient produces a set of control signals designating levels of electric current to apply to valves within the valve assembly. A pressure controller regulates pressure in the supply line in response to the velocity command. When the hydraulic system has a plurality of functions, the control system adjusts each velocity command to equitably apportion fluid to each function when the aggregate flow being demanded by the functions exceeds the total flow available from a source.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: May 11, 2004
    Assignee: Husco International, Inc.
    Inventors: Joseph L. Pfaff, Keith A. Tabor
  • Patent number: 6722224
    Abstract: A joystick for manually operating a pair of hydraulic valve members has a bracket to which a handle is attached. A pivot shaft rotationally extends between a pair of legs of the bracket and has a transverse aperture through which a pivot pin attaches the pivot shaft to a base of the joystick. This attachment structure allows the bracket to pivot with respect to the base about two orthogonal axes. A first link for coupling to one hydraulic valve member is pivotally attached to the pivot shaft, while a second link for coupling to another hydraulic valve member is attached by a ball joint to the bracket.
    Type: Grant
    Filed: January 7, 2002
    Date of Patent: April 20, 2004
    Assignee: Husco International, Inc.
    Inventor: Robert Scott Nordstrom
  • Patent number: 6718759
    Abstract: A hydraulic circuit branch includes a hydraulic actuator, such as a cylinder, and an assembly of one or more electrohydraulic proportional valves connected in series between a pressurized fluid supply line and a tank return line. The force acting on the hydraulic actuator is determined by sensing fluid pressures produced by the hydraulic actuator. Pressures in the supply and tank return lines also are sensed. The sensed pressures and a desired velocity for the hydraulic actuator are employed to determine an equivalent flow coefficient, which characterizes fluid flow through the hydraulic circuit branch, either a conduction or restriction coefficient may be derived. The equivalent flow coefficient is used to determine how to activate each electrohydraulic proportional valve to achieve the desired velocity of the hydraulic actuator. The equivalent flow coefficient also is employed to control the pressure levels in the supply and tank return lines.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: April 13, 2004
    Assignee: Husco International, Inc.
    Inventor: Keith A. Tabor
  • Patent number: 6715402
    Abstract: A system for simultaneously operating first and second hydraulic cylinders has an inlet node for connection to a source of pressurized fluid and an outlet node for connection to a tank. A two-position, three-way primary control valve has a first port connected to the inlet node, a second port connected to the outlet node, and a common port. A first electrohydraulic proportional valve connects the common port to a first port of the first cylinder, and a second electrohydraulic proportional valve connects the common port to a first port of the second cylinder. A third electrohydraulic proportional valve connects the inlet node to a second port of the first cylinder and a second port of the second cylinder. Selectively operating the primary control valve and one of the third and fourth electrohydraulic proportional valves determines the direction in which the first and second cylinders move.
    Type: Grant
    Filed: February 26, 2002
    Date of Patent: April 6, 2004
    Assignee: HUSCO International, Inc.
    Inventors: Joseph L. Pfaff, Dwight B. Stephenson
  • Patent number: 6711767
    Abstract: A device is provided to heat bed covers prior to a person entering the bed on winter nights. This apparatus mounts on a side of the mattress being supported by adjustable elements that extend between the mattress and a box spring. A fan in the apparatus forces room air through an electric heating coil and then through an outlet which directs the air flow between the bed covers.
    Type: Grant
    Filed: January 24, 2003
    Date of Patent: March 30, 2004
    Inventor: Thomas Klamm
  • Patent number: 6710350
    Abstract: An Radiation detector employs one or more arrays of microphotonic light transmission devices to selectively control the flow of light from different detection sites in a scintillator into an optical conduit. For example the microphotonic light transmission devices may be microelectromechanical steerable mirrors or light gates. Instead of employing a separate detector element to convert the light from each site into an electrical signal that is then switched into a data acquisition system, the present detector assembly switches the light into the optical conduit to the data acquisition system.
    Type: Grant
    Filed: March 5, 2002
    Date of Patent: March 23, 2004
    Assignee: GE Medical Systems Information Technologies, Inc.
    Inventor: Richard J. Ruzga
  • Patent number: 6705079
    Abstract: When a swinging boom driven by a hydraulic cylinder stops, inertia causes continued motion of the boom which increases pressure in a chamber of the hydraulic cylinder. Eventually that pressure reaches a level which causes the boom to reverse direction. Then pressure in an opposite cylinder chamber increases until reaching a level that causes the boom movement to reverse again. This oscillation continues until the motion is dampened by other forces acting on the boom. As a result, an operator has difficulty in properly positioning the boom. To reduce this oscillating effect, a sensor detects when the cylinder chamber pressure increases above a given magnitude and then a determination is made when the rate of change of that pressure is less than a defined threshold. Upon that occurrence, a control value is opened to relieve the pressure in that cylinder chamber.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: March 16, 2004
    Assignee: Husco International, Inc.
    Inventors: Keith A. Tabor, Joseph L. Pfaff, Dwight B. Stephenson
  • Patent number: 6705466
    Abstract: A rack for shipping and storing a plurality of glass panels includes a frame which holds a bottom support and a rear support in planes that intersect at substantially a right angle. The bottom and rear supports have notches to receive edges of the panels. The rear support has a plurality of channels with a separate retainer slidably received in each channel for engaging an upper edge of a panel placed in the rack. A spring loaded mechanism maintains the retainers in engagement with the respective panel, thereby holding the panels in the rack.
    Type: Grant
    Filed: January 28, 2002
    Date of Patent: March 16, 2004
    Assignee: Menasha Corporation
    Inventors: David M. Bartholomew, Brandon J. Craig