Patents by Inventor Colin R. Sharpe

Colin R. Sharpe 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).

  • Apparatus for maintaining hydrostatic pressure in an ink jet printhead
    Patent number: 5929882
    Abstract: An ink supply system for an ink jet printing device in which the elevation of the ink reservoir is controlled as a function of the elevation of the printhead orifices. In a preferred embodiment, the ink reservoir is mounted on an elevating carriage which is mechanically linked to the printhead via a Bowden.TM. cable. The cable cooperates with a pulley on the printhead such that rotation of the printhead results in translational movement of the elevating carriage. The dimensions of the pulley are selected such that the elevational changes in the reservoir ink level correspond directly with the elevational changes in the printhead orifices. Thus, the hydrostatic pressure head at the printhead orifices remains constant as the printhead is rotated from its home position to the priming position.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: July 27, 1999
    Inventor: Colin R. Sharpe
  • Print head assembly for ink jet printer
    Patent number: 5126755
    Abstract: An element for a drop on demand ink jet printer employing a lever seal in a housing to control the frequency and quantity of ink delivered to a printing material such as paper.
    Type: Grant
    Filed: March 26, 1991
    Date of Patent: June 30, 1992
    Assignee: Videojet Systems International, Inc.
    Inventors: Colin R. Sharpe, Robert I. Keur