Patents by Inventor Craig MacKenna

Craig MacKenna 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).

  • Video display controller for expanding monochrome data to programmable foreground and background color image data
    Patent number: 4878181
    Abstract: A circuit which expands monochrome character image patterns to color form for use in a raster scanned computer display system. Monochrome patterns are expanded from one bit per pixel to n bits per pixel. Foreground and background colors are programmable in a pattern generator which uses data from the expanded source patterns to select appropriate colors and characters for a destination pattern to be displayed. The expanded multicolor image is generated by hardware.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: October 31, 1989
    Assignee: Signetics Corporation
    Inventors: Craig A. MacKenna, Jan-Kwei J. Li