Patents by Inventor David M. Hagen

David M. Hagen 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-reservoir vents and venting methods
    Patent number: 6969163
    Abstract: Ink reservoirs and methods are provided. One ink reservoir has at least one compartment and first and second vents that communicatively couple the compartment to an atmosphere surrounding an exterior of the ink reservoir.
    Type: Grant
    Filed: August 5, 2003
    Date of Patent: November 29, 2005
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Anthony D. Studer, Kevin D. Almen, David J. Benson, Cary R. Bybee, David M. Hagen