Patents by Inventor Fujio Matsumoto

Fujio Matsumoto 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).

  • Disk cartridge
    Patent number: 4897752
    Abstract: A disk cartridge which comprises a cartridge case, a disk rotatably encased in the cartridge case, and a cleaning sheet supported on the inside surface of the cartridge case by welding, the cartridge case being composed of a thermoplastic synthetic resin, and the cleaning sheet being composed at least of a mixed fabric of acrylic fibers and rayon fibers and being fixed to the inside surfaces of the cartridge case by welding has distinguished disk-handling characteristics and cartridge case-fixing characteristics.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: January 30, 1990
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Hajime Doi, Toru Yamakawa, Fujio Matsumoto, Kunio Mizushima
  • Disk cartridge with cleaning sheet of non-woven fabric
    Patent number: 4803584
    Abstract: A disk cartridge which comprises a cartridge case, a disk rotatably encased in the cartridge case, and a cleaning sheet supported on the inside surface of the cartridge case by welding, the cartridge case being composed of a thermoplastic synthetic resin, and the cleaning sheet being composed of non-woven fabric made mainly of acrylic fibers at least on the disk-facing side of the cleaning sheet and being fixed to the inside surfaces of the cartridge case by ultrasonic or heat welding has distinguished disk-handling characteristics and cartridge case-fixing characteristics.
    Type: Grant
    Filed: April 24, 1987
    Date of Patent: February 7, 1989
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Hajime Doi, Norio Akai, Fujio Matsumoto
  • Recording disc cartridge
    Patent number: 4709816
    Abstract: A recording disc cartridge comprising a recording disc containing, at least in its surface layer, at least one compound selected from the group consisting of an aliphatic acid and its salt and derivative, a case in which the recording disc is rotatively contained, and a liner comprising polyester fiber which is interposed between the case and the recording disc with facing the disc, which has good durability and less drop out.
    Type: Grant
    Filed: March 11, 1986
    Date of Patent: December 1, 1987
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Fujio Matsumoto, Hajime Doi, Kunio Mizushima, Masaya Funahashi, Tomizo Taniguchi, Shoichi Sakamoto
  • Disc cartridge
    Patent number: 4630728
    Abstract: In a disc cartridge comprising a disc case (1) having drive shaft insertion holes (3) on the central portion of the disc case (1) and head insertion holes (4), a disc (2) is rotatably mounted in the disc case (1) and liners (12) laid on the respective inner surfaces of each of the halves of the disc case (1) so as to slidably contact with both surfaces of the disc (2), there are formed ribs (15) on said inner surfaces of the disc case so as generally to surround the part of the drive shaft insertion holes (3).
    Type: Grant
    Filed: September 5, 1984
    Date of Patent: December 23, 1986
    Assignee: Hitachi Maxwell, Ltd.
    Inventors: Fujio Matsumoto, Yoshitake Kato