Patents by Inventor Joseph Robert Stewart

Joseph Robert Stewart 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).

  • Cursor for an on-the-fly digital television display having an intermediate buffer and a refresh buffer
    Patent number: 4093996
    Abstract: A cursor circuit for an on-the-fly digital television display system. The host digital television display system employs an intermediate buffer which stores a coded representation of the symbol only during the period of its display. In order to obtain access of the encoded symbol in storage with a conventional light pen, the circuit secures the identity of the encoded symbol in the intermediate buffer during the first display frame. This identity is the address of the symbol as stored in a refresh buffer. This identity is made available for accessing the refresh buffer during a second display frame. This enables convenient access of the encoded symbol in an on-the-fly digital television display.
    Type: Grant
    Filed: April 23, 1976
    Date of Patent: June 6, 1978
    Assignee: International Business Machines Corporation
    Inventors: Walter John Hogan, Alfred Alexander Schwartz, Joseph Robert Stewart