Patents by Inventor Toru Koyasu

Toru Koyasu 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).

  • Backup control apparatus and method of data processing system
    Patent number: 5522037
    Abstract: The number of present updating data is detected from an updating bit map of a backup target medium. When it is equal to or larger than a reference value, a whole backup is executed. When it is smaller than the reference value, a differential backup is executed. After the backup was obtained, a copy coupling is executed and a merge process to reduce the number of media is performed. By eliminating the unnecessary media among the media which are used and by executing the successive reading or parallel reading from backup destination media, a decoding process to a recovery medium can be executed in a shortest time.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: May 28, 1996
    Assignee: Fujitsu Limited
    Inventors: Isao Kitagawa, Toru Koyasu, Isao Igarashi