Patents by Inventor Gordon S. Mitchard

Gordon S. Mitchard 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).

  • Electrostatic printhead
    Patent number: 5274401
    Abstract: In a printhead for electrostatic printers, the styli of the printhead are formed on a monolithic substrate, such as a printed circuit board. Each stylus has its own driver circuit incorporated into one or more integrated circuit die which are mounted directly on the monolithic substrate, and electrically connected to traces formed on the printed circuit board. The styli are the ends of the traces as formed on the edge of the substrate. The integrated circuit die are connected to the traces by wire bonding or TAB bonding. The printhead is implemented in monoscan, biscan, triscan, and various other configurations.
    Type: Grant
    Filed: June 1, 1992
    Date of Patent: December 28, 1993
    Assignee: Synergy Computer Graphics Corporation
    Inventors: David E. Doggett, Brian J. Dahlquist, Gordon S. Mitchard
  • Electrostatic printer with color hue or grey level controlled by the level and/or duty cycle of voltages applied to each styli
    Patent number: 5062002
    Abstract: A plurality of hues of color or shades of grey are obtained on a print medium using an electrostatic printer by varying either or both the voltage applied to each styli in the print head and the time of application of such voltage.
    Type: Grant
    Filed: April 28, 1989
    Date of Patent: October 29, 1991
    Assignee: Synergy Computer Graphics Corporation
    Inventors: Brian J. Dahlquist, David E. Doggett, Gordon S. Mitchard