Patents by Inventor Shuji Sudo

Shuji Sudo 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).

  • MR composite-type thin-film magnetic head having an upper pole with a high saturation magnetic flux density and an intermediate pole with a high resistivity
    Patent number: 6101068
    Abstract: A thin-film magnetic head includes an MR element serving as a reproducing element and a recording induction coil. The MR element is disposed between a lower magnetic pole and an intermediate magnetic pole. The recording induction coil is disposed between the intermediate magnetic pole and an upper magnetic pole. At least a portion of the upper magnetic pole in the vicinity of a recording gap is formed of a material having a high saturation magnetic flux density of 1.4 T or higher. The intermediate magnetic pole is formed of a material having a high resistivity of 80 .mu..OMEGA..multidot.cm or higher.
    Type: Grant
    Filed: September 22, 1998
    Date of Patent: August 8, 2000
    Assignee: Hitachi Metals, Ltd.
    Inventors: Shigekazu Ohtomo, Shuji Sudo, Yuji Ueda, Kuniaki Yoshimura, Hideji Takahashi
  • Composite magnetic head including a slider plate and a back board
    Patent number: 5717543
    Abstract: A slider plate fixing a front magnetic core at a predetermined position is joined and fixed to a back board provided with a back yoke and a coil layer so that a transducer element is constituted by the front magnetic core, the back yoke, and the coil layer, whereby a composite magnetic head is formed.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: February 10, 1998
    Assignee: Hitachi Metals, Ltd.
    Inventors: Shinichi Ito, Ryo Goto, Tetsuroh Kawai, Kiyoshi Nakajima, Shuji Koike, Shuji Sudo
  • Magnetic disc unit having a plurality of magnetic heads which include multilayer magnetic films
    Patent number: 5590008
    Abstract: A magnetic disc unit has a thin film magnetic head in which a lower magnetic core and an upper magnetic core form a magnetic circuit. The upper magnetic core is constructed by magnetic films having at least two layers. A saturation magnetic flux density of the inside magnetic film, of the magnetic films having at least two layers, facing a magnetic gap of the magnetic circuit is larger than that of the outside magnetic films of the upper magnetic core and the lower magnetic core.
    Type: Grant
    Filed: October 17, 1994
    Date of Patent: December 31, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Masanori Tanabe, Hiroshi Fukui, Tadayuki Iwakura, Kazuhiro Nakamoto, Moriaki Fuyama, Katsuya Mitsuoka, Masaaki Sano, Makoto Saito, Makoto Aihara, Shuji Sudo
  • Seal device for rolling bearing
    Patent number: 5577845
    Abstract: A shield plate for use in an outer race is made from a metal plate in a circular ring shape so as to have notches on its periphery, such that part of the peripheral portions between adjacent notches are folded more strongly than the remaining peripheral portions so as to be a suitable prop for fitting into the outer race, preventing the outer race from being deformed by fitting of the shield plate.
    Type: Grant
    Filed: November 14, 1995
    Date of Patent: November 26, 1996
    Assignee: NSK Ltd.
    Inventors: Yasutaka Ishida, Hironori Suzuki, Shuji Sudo
  • Seal device for rolling bearing
    Patent number: 5435654
    Abstract: A seal device for use in a rolling bearing has a shield plate which is made of an annular metal plate, the outer peripheral half of the annular metal plate comprising a radially inner flat portion and a radially outer bent tail portion which is folded radially inwards to cooperate with the flat portion to provide the shield plate with an outer peripheral edge which is fitted into a retaining groove formed in the outer ring of the bearing.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: July 25, 1995
    Assignees: NSK Ltd, Sudo Corporation
    Inventors: Yasutaka Ishida, Hironori Suzuki, Shuji Sudo