Patents by Inventor Andrew L. Van Brocklin

Andrew L. Van Brocklin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Thermal sensing fluid ejection assembly and method
    Patent number: 9044942
    Abstract: A fluid ejection assembly includes a fluid slot formed in a die. The assembly also includes a nozzle column is formed along a side of the fluid slot. The assembly also includes a pair of thermal sensors to measure die temperature at the middle of the nozzle column and at a first end of the nozzle column.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: June 2, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Robert N. K. Browning, James Gardner, Eric Martin, Andrew L. Van Brocklin, Mark Hunter
  • Inkjet issue determination
    Patent number: 9044936
    Abstract: Determining an issue in an inkjet nozzle may include activating a drive bubble formation mechanism in an ink chamber to eject an ink droplet through the inkjet nozzle and measuring the drive bubble in the ink chamber after the drive bubble formation mechanism is activated.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: June 2, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Andrew L. Van Brocklin, Adam L. Ghozeil, Mark Hunter, Scott A. Linn
  • INKJET PRINTING SYSTEM, FLUID EJECTION SYSTEM, AND METHOD THEREOF
    Publication number: 20150124011
    Abstract: An inkjet printing system, fluid ejection system and method thereof are disclosed. The fluid ejection system includes a fluid ejection device and a determination module to determine a supply condition based on the count value output by the converter module. The fluid ejection device includes a fluid supply chamber to store fluid, an ejection chamber including a nozzle and a corresponding ejection member to selectively eject the fluid through the nozzle, a pressure sensor unit having a sensor plate to output a voltage value corresponding to a cross-sectional area of an amount of fluid in the ejection chamber. The fluid ejection system also includes a converter module to output a count value corresponding to the voltage value output by the pressure sensor unit.
    Type: Application
    Filed: January 12, 2015
    Publication date: May 7, 2015
    Inventors: Andrew L. Van Brocklin, Adam L . Ghozeil, Daryl E. Anderson
  • BIAS CURRENT CONTROL FOR PRINT NOZZLE AMPLIFIER
    Publication number: 20150035909
    Abstract: An apparatus includes an amplifier that drives a piezo print nozzle. A bias adjuster varies bias current in the amplifier as an input signal slew rate varies to the amplifier.
    Type: Application
    Filed: April 25, 2012
    Publication date: February 5, 2015
    Applicant: HEWLETT-PACKARD DEVEOPMENT COMPANY, L.P.
    Inventor: Andrew L. Van Brocklin
  • Inkjet Issue Determination
    Publication number: 20150029250
    Abstract: Determining an issue in an inkjet nozzle may include activating a drive bubble formation mechanism in an ink chamber to eject an ink droplet through the inkjet nozzle and measuring the drive bubble in the ink chamber after the drive bubble formation mechanism is activated.
    Type: Application
    Filed: April 19, 2012
    Publication date: January 29, 2015
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Andrew L. Van Brocklin, Adam L . Ghozeil, Mark Hunter, Scott A. Linn
  • Determining an Issue in an Inkjet Nozzle with Impedance Measurements
    Publication number: 20150029252
    Abstract: A method for determining an issue in an inkjet nozzle with impedance measurements, includes taking a first impedance measurement to detect a drive bubble with an impedance sensor, and taking a second impedance measurement to detect said drive bubble with said impedance sensor after said first impedance measurement.
    Type: Application
    Filed: April 19, 2012
    Publication date: January 29, 2015
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Andrew L. Van Brocklin, Eric T. Martin, Alexander Govyadinov, David Maxfield
  • Determining an issue with an inkjet nozzle using an impedance difference
    Patent number: 8899709
    Abstract: A method for determining an issue with an inkjet nozzle using an impedance difference includes taking a first impedance measurement with a sensor to detect a drive bubble in an ink chamber after a drive bubble formation mechanism is activated; and subtracting the first impedance measurement from a reference.
    Type: Grant
    Filed: April 19, 2012
    Date of Patent: December 2, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Andrew L. Van Brocklin, Eric T. Martin, David Maxfield
  • Detecting a Drive Bubble Formation and Collapse
    Publication number: 20140333694
    Abstract: Measuring an inkjet nozzle may nozzle may include taking at least one impedance measurement after the firing command is sent to detect the presence of a drive bubble and taking another impedance measurement to detect a collapse of the drive bubble.
    Type: Application
    Filed: April 19, 2012
    Publication date: November 13, 2014
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Eric T. Martin, Andrew L. Van Brocklin, David Maxfield
  • Fluid ejection systems and methods thereof
    Patent number: 8882213
    Abstract: Fluid ejection systems and methods thereof are disclosed in the present disclosure. The method includes establishing fluid communication between an ejection chamber and a fluid supply chamber of the fluid ejection system such that the ejection chamber includes a nozzle and an ejection member to selectively eject the fluid through the nozzle. The method also includes detecting at feast one impedance in the fluid by a sensor unit haying a sensor plate, and identifying the characteristic of the fluid by a fluid identification module based on the at least one detected impedance value to obtain an identified fluid characteristic.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: November 11, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Adam L. Ghozeil, Daryl E. Anderson, Andrew L. Van Brocklin
  • PRINTHEAD WAVEFORM VOLTAGE AMPLIFIER
    Publication number: 20140327713
    Abstract: A waveform amplifier for a piezoelectric liquid ejection element. The amplifier provides an amplified waveform to the liquid ejection element.
    Type: Application
    Filed: December 9, 2011
    Publication date: November 6, 2014
    Inventor: Andrew L. Van Brocklin
  • Switchable feedback damping of drop-on-demand piezoelectric fluid-ejection mechanism
    Patent number: 8864280
    Abstract: A control circuit for a drop-on-demand piezoelectric fluid-ejection mechanism includes a drive and sense circuit, and a switch. The drive and sense circuit has an input, a drive output, and a sense output. The drive output is to be coupled to the drop-on-demand piezoelectric fluid-ejection mechanism. The switch is to switch the input of the drive and sense circuit between a feed-forward driving mode of the drive and sense circuit and a feedback damping mode of the drive and sense circuit. In the feed-forward driving mode, the switch is to couple the input to a drive waveform to cause the fluid-ejection mechanism to eject a drop of fluid. In the feedback damping mode, the switch is to couple the input to the sense output to dampen the fluid-ejection mechanism after the fluid-ejection mechanism has ejected the drop of fluid.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: October 21, 2014
    Assignee: Hewlett-Packard Development Company
    Inventor: Andrew L. Van Brocklin
  • Battery temperature sensor
    Patent number: 8828570
    Abstract: A battery temperature sensor may include a substrate and a thin film resistive temperature device (RTD). The substrate can be layered on a battery cell element. The battery cell element can be an anode, a cathode, and a separator between the anode and cathode used in a battery cell. The thin film resistive temperature device (RTD) on the flexible substrate can change resistance with a change in temperature. A battery cell housing can enclose the thin film RTD.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: September 9, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Neel Banerjee, Andrew L. Van Brocklin, Randy Hoffman
  • INKJET PRINTING SYSTEM, FLUID EJECTION SYSTEM, AND METHOD THEREOF
    Publication number: 20140210881
    Abstract: An inkjet printing system, fluid ejection system and method thereof are disclosed. The fluid ejection system includes a fluid ejection device and a determination module to determine a supply condition based on the count value output by the converter module. The fluid ejection device includes a fluid supply chamber to store fluid, an ejection chamber including a nozzle and a corresponding ejection member to selectively eject the fluid through the nozzle, a pressure sensor unit having a sensor plate to output a voltage value corresponding to a cross-sectional area of an amount of fluid in the ejection chamber. The fluid ejection system also includes a converter module to output a count value corresponding to the voltage value output by the pressure sensor unit.
    Type: Application
    Filed: October 24, 2011
    Publication date: July 31, 2014
    Inventors: Andrew L Van Brocklin, Adam L. Ghozeil, Daryl E. Anderson
  • Printhead and related methods and systems
    Patent number: 8789932
    Abstract: A printhead includes a moveable membrane, a piezoelectric actuator to move the membrane, and electronic circuitry disposed on the moveable membrane. A method of fabricating a printhead includes fabricating CMOS circuitry on a first side of a circuit wafer, and forming a chamber in a second side of the circuit wafer such that a bottom of the chamber forms a moveable membrane and the CMOS circuitry is disposed on the moveable membrane opposite the bottom of the chamber. A printing system includes a printhead having CMOS circuitry formed on a first side of a moveable membrane, a chamber having a bottom comprising a second side of the moveable membrane, and a piezoelectric actuator formed over the CMOS circuitry, configured to cause displacement of the moveable membrane into the chamber.
    Type: Grant
    Filed: May 27, 2010
    Date of Patent: July 29, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Andrew L. Van Brocklin, Eric L. Nikkel
  • Crosstalk reduction in piezo printhead
    Patent number: 8770692
    Abstract: Crosstalk in a piezo printhead is reduced by storing a coefficient that expresses an amount of crosstalk between a first nozzle and an adjacent nozzle. A drive waveform voltage is pre-biased using the coefficient, and the pre-biased waveform is applied to a piezoelectric material of the first nozzle.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: July 8, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Andrew L. Van Brocklin, Neel Banerjee
  • Drop detector assembly and method
    Patent number: 8770707
    Abstract: A drop detector assembly includes an ejection element formed on a substrate to eject a fluid drop, and a light detector formed on the substrate to detect light scattered off of the fluid drop. A fluid drop ejected from a nozzle formed in a transparent nozzle plate scatters light that is detected through the transparent nozzle plate.
    Type: Grant
    Filed: September 2, 2010
    Date of Patent: July 8, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Andrew L. Van Brocklin, Donald W. Schulte, Terry McMahon
  • Crosstalk reduction in piezo printhead
    Patent number: 8757750
    Abstract: Crosstalk in a piezo printhead is reduced by selecting an actuation signal for a nozzle, determining a time delay and a pulse width extension based on adjacent actuation signals of adjacent nozzles, and applying the time delay and pulse width extension to the actuation signal.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: June 24, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Neel Banerjee, Andrew L. Van Brocklin, David Pidwerbecki, Christopher Reimer
  • SENSOR NODE LOCATION-BASED POWER OPTIMIZATION
    Publication number: 20140169252
    Abstract: Sensor node location-based power consumption optimization employs an adjustable minimum detectable signal (MDS) level that is set based on a location of a sensor node relative to a location of a source of an event signal. The sensor node includes a sensor to respond to the event signal and an interface module to determine the sensor response to the event signal. The interface module has the adjustable MDS level and a power consumption that is a function of the adjustable MDS level. The adjustable MDS level is set to optimize power consumption.
    Type: Application
    Filed: July 29, 2011
    Publication date: June 19, 2014
    Inventors: Neel Banerjee, George H. Corrigan, Andrew L. Van Brocklin, Anton N. Clarkson, David A. Champion
  • WAVEFORM SELECTION AND/OR SCALING FOR DRIVING NOZZLE OF FLUID-JET PRINTING DEVICE
    Publication number: 20140152726
    Abstract: A controller is for driving a nozzle of a fluid-jet printing device. The controller can select a waveform from a number of waveforms based at least on values for the nozzle. The controller can scale the waveform based on the values for the nozzle. The waveform drives the nozzle to cause the nozzle to eject fluid therefrom.
    Type: Application
    Filed: August 31, 2011
    Publication date: June 5, 2014
    Inventors: Andrew L. Van Brocklin, Eric T. Martin, Neel Banerjee
  • FLUID EJECTION DEVICES AND METHODS THEREOF
    Publication number: 20140132659
    Abstract: Fluid ejection devices and methods thereof are disclosed in the present disclosure. A method includes establishing fluid communication between an ejection chamber and a fluid supply chamber of the fluid ejection device such that the ejection chamber includes a nozzle and an ejection member to selectively eject fluid through the nozzle. The method also includes detecting at least one impedance in the fluid by a sensor unit having a sensor plate.
    Type: Application
    Filed: October 24, 2011
    Publication date: May 15, 2014
    Inventors: Andrew L Van Brocklin, Adam L. Ghozeil, Daryl E. Anderson