Patents by Inventor Michael J. Stella

Michael J. Stella 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).

  • Fault isolation for multiphase clock signals supplied to dual modules which are checked by comparison using residue code generators
    Patent number: 5081629
    Abstract: A clock error detection system is provided for a data processing system that employs multiphase clock signals and dual, substantially identical electronic modules. The clock error detection system employs one clock error detection circuit on one module and a second clock error detection circuit on the other electronic module. An error collector is coupled to the first and second clock error detection circuits on both modules to receive the fault signals. Two complementary residue code generators with different moduli are used in each electronic module to generate clock phase error detection signals, which may be used to detect either missing or extra clock phases.
    Type: Grant
    Filed: January 16, 1991
    Date of Patent: January 14, 1992
    Assignee: Unisys Corporation
    Inventors: Peter B. Criswell, Michael J. Stella