Patents by Inventor Clara S. Johnson

Clara S. Johnson 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).

  • Dual processor control system with continuous parallel interface integrity testing
    Patent number: 5561277
    Abstract: A control system comprises a first processor that generates 16-bit control words and a 16-bit interface check word representing the ones complement of each control word. Preferably, each word is formed as two 8-bit bytes, which are transmitted sequentially to a second processor over an 8-bit parallel interface. The second processor compares each control word with its corresponding interface check word to detect any parallel interface hardware component failures. Preferably, the high and low bytes of the interface check word are swapped prior to transmission to the second processor, and the second processor restores the swaps of the high and low bytes of the interface check word prior to comparing.
    Type: Grant
    Filed: March 15, 1994
    Date of Patent: October 1, 1996
    Assignee: Delaware Capital Formation, Inc.
    Inventors: Philip J. Bockhold, Clara S. Johnson