Patents by Inventor Isamu Yuitoo

Isamu Yuitoo 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: 5719729
    Abstract: In an inductive-write, magnetoresistive-read type magnetic head having a magnetoresistive read head and an inductive write head superimposed on each other, the magnetic center of the read head is made more coincident with the physical center of the write head by a changing of a magnetization direction of a magnetoresistive element. The recording/reproducing apparatus using this magnetic head can thus have a good S/N ratio even if the track width is narrow.
    Type: Grant
    Filed: December 15, 1992
    Date of Patent: February 17, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Naoki Koyama, Yoshihiro Hamakawa, Isamu Yuitoo, Kanji Kawakami, Kazuo Shiiki, Masahiro Kitada
  • Patent number: 4814921
    Abstract: Multilayered magnetic films of the invention comprising at least two unit magnetic films each of which has a thickness of from 0.05 to 0.9 .mu.m and includes a plurality of ferromagnetic layers each having a thickness of from 0.01 to 0.2 .mu.m and a 1 nm to 10 nm thick first intermediate layer consisting of a ferromagnetic, nonmagnetic or antiferromagnetic material and provided between adjacent ferromagnetic layers, and a second intermediate layer having a thickness of from 10 to 40 nm, consisting of a nonmagnetic or antiferromagnetic material and provided between the at least two unit magnetic films. The multilayered magnetic film is suitable as a pole of a thin-film magnetic head. An underlayer may be further provided between the magnetic film and a substrate whereby a multilayered magnetic film having good characteristics can be obtained.
    Type: Grant
    Filed: February 1, 1988
    Date of Patent: March 21, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Yoshihiro Hamakawa, Kazuo Shiiki, Yoshihiro Shiroishi, Isamu Yuitoo, Hitoshi Numasaka, Noriyuki Kumasaka, Shigekazu Otomo, Eijin Moriwaki