Patents by Inventor Fred E. Tarver

Fred E. Tarver 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).

  • Ink jet printer cartridge refilling method and apparatus
    Patent number: 5742308
    Abstract: An ink jet printer having a travelling ink jet pen with a foam-filled ink chamber. A separate source reservoir includes an ink outlet nozzle connectable to the pen chamber for refilling. A probe on the reservoir partially compresses the foam to decrease its ink capacity during filling. An electrical contact on the reservoir or pen detects over-filling and over-saturation of the foam to stop the filling process. As the foam is decompressed, its increased absorptive capacity accommodates any excess overflow.
    Type: Grant
    Filed: March 30, 1994
    Date of Patent: April 21, 1998
    Assignee: Hewlett-Packard Company
    Inventors: Bruce Cowger, Robert R. Beeson, Fred E. Tarver
  • Pressure-sensitive accumulator for ink-jet pens
    Patent number: 5505339
    Abstract: The accumulator regulates changes in the back pressure of an ink-jet pen reservoir so that ink does not leak from the pen print head and so that the print head is able to completely empty the reservoir of ink. The accumulator includes a flexible bag that is mounted to a flat curved spring. The elasticity of the spring tends to contract the bag as the bag expands in response to back pressure reduction in the reservoir.
    Type: Grant
    Filed: January 20, 1995
    Date of Patent: April 9, 1996
    Assignee: Hewlett-Packard Company
    Inventors: Bruce Cowger, Marc A. Baldwin, Fred E. Tarver, Gary D. Tarver, John G. Wydronek, George M. Custer
  • Pressure-sensitive accumulator for ink-jet pens
    Patent number: 5409134
    Abstract: The accumulator regulates changes in the back pressure of an ink-jet pen reservoir so that ink does not leak from the pen print head and so that the print head is able to completely empty the reservoir of ink. The accumulator includes a flexible bag that is mounted to a flat curved spring. The elasticity of the spring tends to contract the bag as the bag expands in response to back pressure reduction in the reservoir.
    Type: Grant
    Filed: December 11, 1991
    Date of Patent: April 25, 1995
    Assignee: Hewlett-Packard Corporation
    Inventors: Bruce Cowger, Marc A. Baldwin, Fred E. Tarver, Gary D. Tarver, John G. Wydronek, George M. Custer