Patents by Inventor Dave A. Canton

Dave A. Canton 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).

  • Display apparatus with mixed alphanumeric and graphic image
    Patent number: 4686521
    Abstract: A graphics display apparatus employing a raster scanned cathode ray tube uses a refresh buffer constituted by a coded alphanumeric buffer and an associated character generator for displaying alphanumeric characters and other symbols and an all-points-addressable buffer for displaying graphics. Serialized data from the two buffers are mixed in a mixer under control of at least one control bit (attribute) stored in the coded buffer to provide a composite pel-representing bit stream supplied to the cathode ray tube.
    Type: Grant
    Filed: March 6, 1985
    Date of Patent: August 11, 1987
    Assignee: International Business Machines Corporation
    Inventors: Paul A. Beaven, Dave A. Canton, Nick B. Sargeant, Tom H. Snagge