Patents by Inventor David Maxfield

David Maxfield 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).

  • PRINTER FLUID IMPEDANCE SENSING IN A PRINTHEAD
    Publication number: 20180022091
    Abstract: In some examples, a printhead includes a firing chamber to receive printer fluid, an ejector positioned in the firing chamber to eject printer fluid droplets from the printhead, and a nozzle in fluid communication with the firing chamber. The printhead can further include an impedance sensor positioned in the firing chamber to contact printer fluid to measure impedance values of the printer fluid. The impedance sensor can be connectable to a controller to transmit impedance values of printer fluid to the controller.
    Type: Application
    Filed: April 30, 2015
    Publication date: January 25, 2018
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Gerard Alzona, David Maxfield, Dustin W Blair, Sterling Chaffins, Andrew L Van Brocklin
  • FLUID EJECTION APPARATUS WITH SINGLE POWER SUPPLY CONNECTOR
    Publication number: 20180001634
    Abstract: An example provides a fluid ejection apparatus including a fluid feed slot along a length of a print head die of the fluid ejection apparatus to supply a fluid to a plurality of drop ejectors, control circuitry adjacent to at least one side of the fluid feed slot to control ejection of drops of fluid from the plurality of drop ejectors, and a single power supply connector at an end of the print head die to supply power to the control circuitry.
    Type: Application
    Filed: September 15, 2017
    Publication date: January 4, 2018
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Adam L. Ghozeil, David Maxfield, Peter James Fricke
  • FLUID EJECTION APPARATUS WITH SINGLE-SIDE THERMAL SENSOR
    Publication number: 20180001628
    Abstract: An example provides a fluid ejection apparatus including a fluid feed slot to supply a fluid to a plurality of drop ejectors, a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors, and a second rib at a second side, opposite the first side, of the fluid feed slot supporting a thermal sensor to facilitate determination of a temperature of the first rib and the second rib.
    Type: Application
    Filed: September 15, 2017
    Publication date: January 4, 2018
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventor: David Maxfield
  • LIQUID PROPELLING COMPONENT
    Publication number: 20170326884
    Abstract: A liquid propelling component includes a liquid channel, a circuit block. The circuit block includes a first conductor disposed in the liquid channel to be in contact with liquid in the channel and a second conductor insulated from liquid in the channel. The liquid propelling component further includes a memory storing a digital code that corresponds to an analogue value of the second conductor under a predefined charge.
    Type: Application
    Filed: November 25, 2014
    Publication date: November 16, 2017
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Vincent C Korthuis, David Maxfield, Andrew Queisser
  • Fluid ejection apparatus with single power supply connector
    Patent number: 9796181
    Abstract: An example provides a fluid ejection apparatus including a fluid feed slot along a length of a print head die of the fluid ejection apparatus to supply a fluid to a plurality of drop ejectors, control circuitry adjacent to at least one side of the fluid feed slot to control ejection of drops of fluid from the plurality of drop ejectors, and a single power supply connector at an end of the print head die to supply power to the control circuitry.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: October 24, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Adam L. Ghozeil, David Maxfield, Peter James Fricke
  • Fluid ejection apparatus with single-side thermal sensor
    Patent number: 9796178
    Abstract: An example provides a fluid ejection apparatus including a fluid feed slot to supply a fluid to a plurality of drop ejectors, a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors, and a second rib at a second side, opposite the first side, of the fluid feed slot supporting a thermal sensor to facilitate determination of a temperature of the first rib and the second rib.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: October 24, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: David Maxfield
  • FLUID EJECTION APPARATUS WITH SINGLE-SIDE THERMAL SENSOR
    Publication number: 20170217165
    Abstract: An example provides a fluid ejection apparatus including a fluid feed slot to supply a fluid to a plurality of drop ejectors, a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors, and a second rib at a second side, opposite the first side, of the fluid feed slot supporting a thermal sensor to facilitate determination of a temperature of the first rib and the second rib.
    Type: Application
    Filed: April 13, 2017
    Publication date: August 3, 2017
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventor: David Maxfield
  • Determining an issue in an inkjet nozzle with impedance measurements
    Patent number: 9701116
    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: Grant
    Filed: September 12, 2016
    Date of Patent: July 11, 2017
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Andrew L. Van Brocklin, Eric T. Martin, Alexander Govyadinov, David Maxfield
  • PRINTHEAD ASSEMBLY
    Publication number: 20170157940
    Abstract: A printhead assembly is provided, the printhead assembly including a printhead die, a black fluid slot formed in the printhead die to deliver black printing fluid, and a color fluid slot formed in the printhead die to deliver color printing fluid.
    Type: Application
    Filed: February 16, 2017
    Publication date: June 8, 2017
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: David Maxfield, Sean P. McClelland
  • Fluid ejection apparatus with single-side thermal sensor
    Patent number: 9669624
    Abstract: An example provides a fluid ejection apparatus including a fluid feed slot to supply a fluid to a plurality of drop ejectors, a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors, and a second rib at a second side, opposite the first side, of the fluid feed slot supporting a thermal sensor to facilitate determination of a temperature of the first rib and the second rib.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: June 6, 2017
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: David Maxfield
  • Printhead assembly
    Patent number: 9610772
    Abstract: A printhead assembly is provided, the printhead assembly including a printhead die, a black fluid slot formed in the printhead die to deliver black printing fluid, and a color fluid slot formed in the printhead die to deliver color printing fluid.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: April 4, 2017
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: David Maxfield, Sean P. McClelland
  • PRINTHEADS WITH SENSOR PLATE IMPEDANCE MEASUREMENT
    Publication number: 20170028738
    Abstract: In an implementation, a printhead includes a nozzle and a fluid channel. A sensor plate is located within the fluid channel. An impedance measurement circuit is coupled to the sensor plate to measure impedance of fluid within the channel during a fluid movement event that moves fluid past the sensor plate.
    Type: Application
    Filed: January 30, 2014
    Publication date: February 2, 2017
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Adam L. Ghozeil, Scott A. Linn, David Maxfield, Andrew Van Brocklin
  • FLUID EJECTION APPARATUS WITH SINGLE POWER SUPPLY CONNECTOR
    Publication number: 20170021617
    Abstract: An example provides a fluid ejection apparatus including a fluid feed slot along a length of a print head die of the fluid ejection apparatus to supply a fluid to a plurality of drop ejectors, control circuitry adjacent to at least one side of the fluid feed slot to control ejection of drops of fluid from the plurality of drop ejectors, and a single power supply connector at an end of the print head die to supply power to the control circuitry.
    Type: Application
    Filed: November 27, 2013
    Publication date: January 26, 2017
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Adam L. Ghozeil, David Maxfield, Peter James Fricke
  • FLUID EJECTION APPARATUS WITH SINGLE-SIDE THERMAL SENSOR
    Publication number: 20170021614
    Abstract: An example provides a fluid ejection apparatus including a fluid feed slot to supply a fluid to a plurality of drop ejectors, a first rib at a first side of the fluid feed slot and supporting drop ejection circuitry to control ejection of drops of the fluid from the plurality of drop ejectors, and a second rib at a second side, opposite the first side, of the fluid feed slot supporting a thermal sensor to facilitate determination of a temperature of the first rib and the second rib.
    Type: Application
    Filed: November 26, 2013
    Publication date: January 26, 2017
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventor: David Maxfield
  • DETERMINING AN ISSUE IN AN INKJET NOZZLE WITH IMPEDANCE MEASUREMENTS
    Publication number: 20170008285
    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: September 12, 2016
    Publication date: January 12, 2017
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Andrew L. Van Brocklin, Eric T. Martin, Alexander Govyadinov, David Maxfield
  • Determining an issue in an inkjet nozzle with impedance measurements
    Patent number: 9463622
    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: Grant
    Filed: December 7, 2015
    Date of Patent: October 11, 2016
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Andrew L. Van Brocklin, Eric T. Martin, Alexander Govyadinov, David Maxfield
  • Detecting a Drive Bubble Formation and Collapse
    Publication number: 20160271940
    Abstract: Measuring an inkjet 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: June 1, 2016
    Publication date: September 22, 2016
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Eric T. Martin, Andrew L. Van Brocklin, David Maxfield
  • Detecting a drive bubble formation and collapse
    Patent number: 9409393
    Abstract: Measuring an inkjet 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: Grant
    Filed: April 19, 2012
    Date of Patent: August 9, 2016
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Eric T. Martin, Andrew L. Van Brocklin, David Maxfield
  • Determining an issue in an inkjet nozzle with impedance measurements
    Patent number: 9352564
    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: Grant
    Filed: April 19, 2012
    Date of Patent: May 31, 2016
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Andrew L. Van Brocklin, Eric T. Martin, Alexander Govyadinov, David Maxfield
  • DETERMINING AN ISSUE IN AN INKJET NOZZLE WITH IMPEDANCE MEASUREMENTS
    Publication number: 20160082725
    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: December 7, 2015
    Publication date: March 24, 2016
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Andrew L. Van Brocklin, Eric T. Martin, Alexander Govyadinov, David Maxfield