Patents by Inventor Jason Oak

Jason Oak 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).

  • Fluid ejection assembly with circulation pump
    Patent number: 9381739
    Abstract: A fluid ejection assembly includes a fluid slot, a recirculation channel, and a drop ejection element within the recirculation channel. A pump element is configured to pump fluid to and from the fluid slot through the recirculation channel. A first addressable drive circuit associated with the drop ejection element and a second addressable drive circuit associated with the pump element are capable of driving the drop ejection element and the pump element simultaneously.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: July 5, 2016
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Jason Oak
  • Fluid ejection device with two-layer tophat
    Patent number: 9156262
    Abstract: In an embodiment, a fluid ejection device includes a substrate with a fluid slot, and a chamber layer over the substrate that defines a firing chamber and a fluidic channel extending through the firing chamber and in fluid communication with the slot at first and second ends. The device includes a tophat layer formed as a two-layer stack over the chamber layer, and a nozzle bore over the firing chamber that comprises a greater cavity formed in a first layer of the stack and a lesser cavity formed in a second layer of the stack, the greater cavity encompasses a larger volume than the lesser cavity.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: October 13, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Brian M. Taff, Michael Hager, Jason Oak
  • Fluid Ejection Assembly with Circulation Pump
    Publication number: 20150091989
    Abstract: A fluid ejection assembly includes a fluid slot, a recirculation channel, and a drop ejection element within the recirculation channel. A pump element is configured to pump fluid to and from the fluid slot through the recirculation channel. A first addressable drive circuit associated with the drop ejection element and a second addressable drive circuit associated with the pump element are capable of driving the drop ejection element and the pump dement simultaneously.
    Type: Application
    Filed: December 9, 2014
    Publication date: April 2, 2015
    Inventors: Alexander Govyadinov, Jason Oak
  • Fluid ejection assembly with circulation pump
    Patent number: 8939531
    Abstract: A fluid ejection assembly includes a fluid slot, a recirculation channel, and a drop ejection element within the recirculation channel. A pump element is configured to pump fluid to and from the fluid slot through the recirculation channel. A first addressable drive circuit associated with the drop ejection element and a second addressable drive circuit associated with the pump element are capable of driving the drop ejection element and the pump element simultaneously.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: January 27, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Alexander Govyadinov, Jason Oak
  • FLUID EJECTION ASSEMBLY WITH CIRCULATION PUMO
    Publication number: 20130155135
    Abstract: A fluid ejection assembly includes a fluid slot, a recirculation channel, and a drop ejection element within the recirculation channel. A pump element is configured to pump fluid to and from the fluid slot through the recirculation channel. A first addressable drive circuit associated with the drop ejection element and a second addressable drive circuit associated with the pump element are capable of driving the drop ejection element and the pump element simultaneously.
    Type: Application
    Filed: October 28, 2010
    Publication date: June 20, 2013
    Inventors: Alexander Govyadinov, Jason Oak