Patents by Inventor John Mohr

John Mohr 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).

  • Thermal ink jet print device having phase change cooling
    Patent number: 5272491
    Abstract: A thermal ink jet print device having a phase change material, a solid or fluid, disposed in heat exchange proximity to the thermal ink jet printhead to absorb printhead heat energy by changing physical state at a printhead temperature below that at which unacceptable printing takes place and at a rate commensurate with the rate of heat energy input.
    Type: Grant
    Filed: April 3, 1992
    Date of Patent: December 21, 1993
    Assignee: Hewlett-Packard Company
    Inventors: Stuart D. Asakawa, John A. Mohr, John L. Stoffel, William D. Kappele, Bruce E. Mueller, Gerold G. Firl
  • Capillary reservoir binary ink level sensor
    Patent number: 5079570
    Abstract: An ink level sensor (18, 18', 18") is provided for detecting the level of ink in an ink cartridge (10) containing a capillary reservoir (14), such as foam, therein. The ink level sensor is a binary fluidic indicator, which provides both a human and machine readable indication of the level of the ink. A plurality of embodiments are described, including a two-port sensor (20), a one-port sensor (22), and a pair of fluidically-connected needles of different length (24).
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: January 7, 1992
    Assignee: Hewlett-Packard Company
    Inventors: John A. Mohr, Michael B. Lloyd, Scott W. Hock, Mindy A. Hamlin