Patents by Inventor David Matthew Johnson

David Matthew Johnson 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).

  • Inkjet printhead incorporating oleophobic membrane
    Patent number: 9044943
    Abstract: An inkjet printhead includes an oleophobic membrane arranged at a location that allows the oleophobic membrane to simultaneously vent air from an ink flow channel of the printhead and to retain ink within the ink flow channel. The oleophobic membrane includes a metal structure having a nanostructured surface and low-surface energy coating disposed on the metal structure.
    Type: Grant
    Filed: April 3, 2013
    Date of Patent: June 2, 2015
    Assignee: PALO ALTO RESEARCH CENTER INCORPORATED
    Inventors: Norine Chang, David Matthew Johnson, Scott J. Limb, John S. Paschkewitz, Eric J. Shrader
  • Methods and devices for venting air from ink jet printer subassemblies using oleophobic membranes
    Patent number: 9016841
    Abstract: An ink jet printer subassembly comprises an ink flow channel that includes an oleophobic membrane configured to contain ink in the ink flow channel while allowing air to vent out of the ink flow channel through the oleophobic membrane.
    Type: Grant
    Filed: April 3, 2013
    Date of Patent: April 28, 2015
    Assignee: Palo Alto Research Center Incorporated
    Inventors: David Matthew Johnson, Norine Chang, Eric J. Shrader, John S. Paschkewitz
  • METHODS AND DEVICES FOR VENTING AIR FROM INK JET PRINTER SUBASSEMBLIES USING OLEOPHOBIC MEMBRANES
    Publication number: 20140300666
    Abstract: An ink jet printer subassembly comprises an ink flow channel that includes an oleophobic membrane configured to contain ink in the ink flow channel while allowing air to vent out of the ink flow channel through the oleophobic membrane.
    Type: Application
    Filed: April 3, 2013
    Publication date: October 9, 2014
    Inventors: David Matthew Johnson, Norine Chang, Eric J. Shrader, John S. Paschkewitz
  • Network-accessible account system
    Patent number: 6963857
    Abstract: The present invention is directed to methods of, and systems for, allowing an account participant to add value via a wide-area network to a first account from a second account. A first account server coupled to a wide-area network supports the first account. In a preferred embodiment the wide-area-network-accessible value transfer station (VTS) includes a central processing unit for executing instructions, and a memory unit.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: November 8, 2005
    Assignee: JSA Technologies
    Inventor: David Matthew Johnson