Patents by Inventor Toshikatsu Narumi

Toshikatsu Narumi 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).

  • Unauthorized use preventing method for optical disks, optical disk having unauthorized use prevention function, and optical disk apparatus
    Patent number: 5982886
    Abstract: In a method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area, first information is read from the user inaccessible area of the recording medium. The first information is compared with second information concerning a true recording medium (lawfully produced copy). It is then concluded that the recording medium is the true recording medium when the first information corresponds to the second information.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: November 9, 1999
    Assignee: Fujitsu Limited
    Inventors: Satoshi Itami, Kenichi Utsumi, Masahiro Nakada, Hiroshi Suzuki, Kazunori Naito, Kazuo Nakashima, Toshikatsu Narumi, Masaru Nakahara
  • Unauthorized use prevention method for optical disks, optical disk having unauthorized use prevention function, and optical disk apparatus
    Patent number: 5418852
    Abstract: In a method for preventing unauthorized use of a recording medium having a user accessible area and a user inaccessible area, first information is read from the user inaccessible area of the recording medium. The first information is compared with second information concerning a true recording medium (lawfully produced copy). It is then concluded that the recording medium is the true recording medium when the first information corresponds to the second information.
    Type: Grant
    Filed: March 17, 1993
    Date of Patent: May 23, 1995
    Assignee: Fujitsu Limited
    Inventors: Satoshi Itami, Kenichi Utsumi, Masahiro Nakada, Hiroshi Suzuki, Kazunori Naito, Kazuo Nakashima, Toshikatsu Narumi, Masaru Nakahara
  • Apparatus for making music database and retrieval apparatus for such database
    Patent number: 5402339
    Abstract: An apparatus for making a musical database including a converting unit for converting musical information representing a music piece into note data items, each of note data items being a set of values associated with a period of a single sound denoted by a musical note and a scale level of the single sound denoted by the musical note, a position unit for producing position data items for the note data items, the position data items representing positions at which the note data items are positioned in the musical information, a unit for producing an index indicating relationships between the note data items and the position data items, and a storage unit for storing the index. A retrieval apparatus retrieves a string of note data items from a musical database using the index stored in the storage unit.
    Type: Grant
    Filed: September 28, 1993
    Date of Patent: March 28, 1995
    Assignee: Fujitsu Limited
    Inventors: Kazuo Nakashima, Masahiro Nakada, Toshikatsu Narumi, Kazunori Naito