Patents by Inventor Berkeley Fisher

Berkeley Fisher 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).

  • Publication number: 20200031127
    Abstract: A fluid ejection system includes a fluid ejection die and a controller. The fluid ejection die includes a plurality of nozzles to eject fluid drops and a plurality of strain gauge sensors to sense strain within the fluid ejection die. The controller is to receive the sensed strain from each strain gauge sensor to determine a status of the fluid ejection die.
    Type: Application
    Filed: April 24, 2017
    Publication date: January 30, 2020
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: James Gardner, Berkeley Fisher, Andrew Koll
  • Publication number: 20200033203
    Abstract: A fluid ejection die includes a plurality of nozzles to eject fluid drops and a plurality of strain gauge sensors to sense strain. Each strain gauge sensor corresponds to a nozzle and passes the sensed strain to a controller to determine the health of the nozzle based on the sensed strain.
    Type: Application
    Filed: April 24, 2017
    Publication date: January 30, 2020
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Daryl E Anderson, James Gardner, Berkeley Fisher
  • Publication number: 20190137316
    Abstract: An example printing cartridge includes a fluid container, a sensing die including a plurality of sensing locations in thermal contact with the fluid container, and a voltage comparator to output time-based information by comparing a sensed voltage generated at a selected sensing location of the plurality of sensing locations to a threshold voltage, the time-based information representative of whether a fluid is present at the sensing location.
    Type: Application
    Filed: April 29, 2016
    Publication date: May 9, 2019
    Inventors: Daryl E. Anderson, James Michael Gardner, Berkeley Fisher, Michael W. Cumbie
  • Publication number: 20190126631
    Abstract: An example printing cartridge includes a fluid container, a plurality of capacitor plates to detect fluid in the fluid container, each of the capacitor plates associated with a respective fluid level, and a shift register to capture fluid level information from the plurality of capacitor plates.
    Type: Application
    Filed: April 29, 2016
    Publication date: May 2, 2019
    Inventors: Daryl E. Anderson, James Michael Gardner, Scott A. Linn, Michael W. Cumbie, Berkeley Fisher
  • Publication number: 20190126632
    Abstract: In one example, a fluid level sensor includes control logic, and an array of sensing locations to detect a level of fluid in a container. The array of sensing locations include a number of memory cells located at a number of sensing locations in the array of sensing locations, a word line coupled to the memory cells, a bit line coupled to the memory cells, and a pre-charge circuit coupled to the word line and the bit line. The control logic instructs a number FETs coupled to a bit line to disconnect from a number of the memory cells, and power up the memory cells to cause the memory cells to take a first state or a second state. The control logic outputs the state of the memory cells to a Pre-charge processing device. The state of the memory cells defines the level of the fluid in the container.
    Type: Application
    Filed: July 19, 2016
    Publication date: May 2, 2019
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Daryl E. Anderson, James Michael Gardner, Berkeley Fisher, Scott A. Linn
  • Publication number: 20190118527
    Abstract: A method of detecting a level of printable fluid in a container includes, with at least one sensing location on a die in thermal contact with the printable fluid in the container, sensing a voltage of a capacitor over time as current from the capacitor leaks through a field effect transistor (FET). The FET and capacitor are associated with the sensing location. The method may further include, based on the voltage of the capacitor over time and a threshold voltage, determining whether the printable fluid is present at the at least one sensing location.
    Type: Application
    Filed: July 11, 2016
    Publication date: April 25, 2019
    Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Daryl E. Anderson, James Michael Gardner, Michael W. Cumbie, Scott A. Linn, Berkeley Fisher
  • Publication number: 20190111696
    Abstract: An example printing cartridge includes a sensing die including a plurality of sensing locations in thermal contact with a fluid container, an on-die controller to select a sensing location of the plurality of sensing locations to activate and to provide a variable threshold voltage, and a voltage comparator to compare a sensed voltage generated at a selected sensing location to the variable threshold voltage, and output time-based information based on the comparison, the time-based information representative of whether a fluid is present at a fluid level associated with the selected sensing location.
    Type: Application
    Filed: April 29, 2016
    Publication date: April 18, 2019
    Inventors: Daryl E. Anderson, Michael W. Cumbie, James Michael Gardner, Berkeley Fisher
  • Publication number: 20190111695
    Abstract: An example printing cartridge includes a fluid container, a plurality of sensing locations in thermal contact with the fluid container, a voltage comparator to output time-based information based on a comparison of a sensed voltage generated at a selected sensing location of the plurality of sensing locations to a threshold voltage, the time-based information representative of whether a fluid is present at a fluid level associated with the selected sensing location, and a counter to convert the time-based information to a digital code based on a number of clock cycles.
    Type: Application
    Filed: April 29, 2016
    Publication date: April 18, 2019
    Inventors: Daryl E. Anderson, James Michael Gardner, Berkeley Fisher, Michael W. Cumbie