Patents by Inventor Theodore J. Friedl

Theodore J. Friedl 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).

  • Data file directory system and method for writing data file directory information
    Patent number: 5537652
    Abstract: A data storage medium having the ability to recover from media errors includes a directory located at any desired region of a data storage area with redundant directory pointers at reserved locations. A unique file token is included in the directory entry for each data file and is also included in each extent list where the locations of parts of a fragmented data file are stored. Multiple extent lists are chained in two directions to facilitate reconstruction of the chain if part of the pointer information is lost.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: July 16, 1996
    Assignee: International Business Machines Corporation
    Inventors: Theodore J. Friedl, Leon E. Gregg, Larry W. Loen, Randy K. Rolfe