Patents by Inventor Osamu Shimura

Osamu Shimura 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).

  • Patent number: 7568067
    Abstract: A tape operation relating to EOF identification in an open process for a file is emulated, whereby the tape operation in the open process is simplified. Consequently, open-process, close-process performance, and process performance of a system accessing to a magnetic tape unit can be improved. In a method of this invention, a position of a head relative to a magnetic tape is fixed at a predetermined position in the open process for a file recorded on the magnetic tape, and when a command is received from a command issuing apparatus, emulation in which a tape operation according the command is virtually carried out in the magnetic tape unit without making said magnetic tape unit carry out a real tape operation, is executed.
    Type: Grant
    Filed: March 30, 2000
    Date of Patent: July 28, 2009
    Assignee: Fujitsu Limited
    Inventors: Tomonori Mase, Yukio Taniyama, Shoichi Okumura, Osamu Shimura
  • Patent number: 6026468
    Abstract: The present invention is made such that data in a buffer can be transferred even when read back commands are continuously issued so as to completely eliminate the need for a mechanical operation required for each data block in ROR processing, resulting in considerably reducing a processing time.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: February 15, 2000
    Assignee: Fujitsu Limited
    Inventors: Tomonori Mase, Katsuo Enohara, Osamu Shimura