Patents by Inventor Stephen A. Schuerich

Stephen A. Schuerich 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).

  • High integrity cache directory
    Patent number: 6898738
    Abstract: Cache memory, and thus computer system, reliability is increased by duplicating cache tag entries. Each cache tag has a primary entry and a duplicate entry. Then, when cache tags are associatively searched, both the primary and the duplicate entry are compared to the search value. At the same time, they are also parity checked and compared against each other. If a match is made on either the primary entry or the duplicate entry, and that entry does not have a parity error, a cache “hit” is indicated. All single bit cache tag parity errors are detected and compensated for. Almost all multiple bit cache tag parity errors are detected.
    Type: Grant
    Filed: July 17, 2001
    Date of Patent: May 24, 2005
    Assignee: Bull HN Information Systems Inc.
    Inventors: Charles P. Ryan, William A. Shelly, Stephen A. Schuerich
  • High integrity cache directory
    Publication number: 20030018936
    Abstract: Cache memory, and thus computer system, reliability is increased by duplicating cache tag entries. Each cache tag has a primary entry and a duplicate entry. Then, when cache tags are associatively searched, both the primary and the duplicate entry are compared to the search value. At the same time, they are also parity checked and compared against each other. If a match is made on either the primary entry or the duplicate entry, and that entry does not have a parity error, a cache “hit” is indicated. All single bit cache tag parity errors are detected and compensated for. Almost all multiple bit cache tag parity errors are detected.
    Type: Application
    Filed: July 17, 2001
    Publication date: January 23, 2003
    Applicant: Bull NH Information Systems Inc.
    Inventors: Charles P. Ryan, William A. Shelly, Stephen A. Schuerich