Patents by Inventor David Douglas Hall

David Douglas Hall 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).

  • Printhead with recessed slot ends
    Patent number: 10369788
    Abstract: A fluid ejection device may include a substrate having front and back opposing surfaces and a slot extending through the substrate between the back and front surfaces and along an axis of the substrate. A recessed end region may be formed in the back surface at each end of the slot.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: August 6, 2019
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Rio Rivas, Ed Friesen, Terry McMahon, Donald W. Schulte, David Douglas Hall
  • Printhead with recessed slot ends
    Patent number: 9707586
    Abstract: In an embodiment, a method of forming a printhead includes forming on a front-side surface of a substrate, a thin film layer and a plurality of fluidic channels and ejection chambers. The method also includes forming a slot through the substrate from the back-side surface to the front-side surface, where the back-side and front-side surfaces generally oppose one another. The slot has a length extending along a long axis of the substrate and a width extending along a short axis of the substrate. The method includes forming recessed regions into the back-side surface of the substrate at both ends of the slot that extend beyond the length of the slot.
    Type: Grant
    Filed: March 16, 2012
    Date of Patent: July 18, 2017
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Rio Rivas, Ed Friesen, Terry McMahon, Donald W. Schulte, David Douglas Hall
  • PRINTHEAD WITH RECESSED SLOT ENDS
    Publication number: 20170157925
    Abstract: A fluid ejection device may include a substrate having front and back opposing surfaces and a slot extending through the substrate between the back and front surfaces and along an axis of the substrate. A recessed end region may be formed in the back surface at each end of the slot.
    Type: Application
    Filed: December 15, 2016
    Publication date: June 8, 2017
    Inventors: Rio Rivas, Ed Friesen, Terry McMahon, Donald W. Schulte, David Douglas Hall
  • PRINTHEAD WITH RECESSED SLOT ENDS
    Publication number: 20150001316
    Abstract: In an embodiment, a method of forming a printhead includes forming on a front-side surface of a substrate, a thin film layer and a plurality of fluidic channels and ejection chambers. The method also includes forming a slot through the substrate from the back-side surface to the front-side surface, where the back-side and front-side surfaces generally oppose one another. The slot has a length extending along a long axis of the substrate and a width extending along a short axis of the substrate. The method includes forming recessed regions into the back-side surface of the substrate at both ends of the slot that extend beyond the length of the slot.
    Type: Application
    Filed: March 16, 2012
    Publication date: January 1, 2015
    Inventors: Rio Rivas, Ed Friesen, Terry McMahon, Donald W. Schulte, David Douglas Hall
  • Transistor antifuse device
    Patent number: 7679426
    Abstract: In one embodiment, a method provides a bipolar junction transistor that is coupled to a first power supply. A second power supply is utilized to turn on the bipolar junction transistor. And, the bipolar junction transistor is overdriven.
    Type: Grant
    Filed: January 19, 2005
    Date of Patent: March 16, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Donald W. Schulte, Terry McMahon, David Douglas Hall