Patents by Inventor Katsuo Watanabe

Katsuo Watanabe 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).

  • Magnetoresistive effect type reproducing head and magnetic disk apparatus equipped with the reproducing head
    Patent number: 6563677
    Abstract: A magnetoresistive effect type reproducing head includes a lower magnetic shield made of magnetic material, an upper magnetic shield made of magnetic material, a magnetoresistive effect type element formed between the lower magnetic shield layer and the upper magnetic shield layer, a lower inter-layer insulating film formed between the magnetoresistive effect type element and the lower magnetic shield, and an upper inter-layer insulation film formed between the magnetoresistive effect type element and the upper magnetic shield. At least one of the lower and upper magnetic shields includes a first magnetic layer made of a first material having first electric resistivity and a second magnetic layer made of a second material having second electric resistivity higher than the first electric resistivity.
    Type: Grant
    Filed: January 8, 2002
    Date of Patent: May 13, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Shun-ichi Narumi, Hiroshi Fukui, Katsumi Hoshino, Katsuo Watanabe, Kazue Kudo, Moriaki Fuyama
  • Magnetoresistive effect type reproducing head and magnetic disk apparatus equipped with the reproducing head
    Patent number: 6385015
    Abstract: A magnetoresistive effect type reproducing head is formed by stacking a lower magnetic shield made of magnetic material, a lower inter-layer insulation film, a magnetoresistive effect type element for detecting magnetic field by using a magnetoresistive effect, an upper inter-layer insulation film, and an upper magnetic shield made of magnetic material, on a substrate in this order, wherein a resistivity of at least one of the lower and upper magnetic shields is more than 200 &mgr;&OHgr;·cm.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: May 7, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Shun-ichi Narumi, Hiroshi Fukui, Katsumi Hoshino, Katsuo Watanabe, Kazue Kudo, Moriaki Fuyama
  • Magnetoresistive effect type reproducing head and magnetic disk apparatus equipped with the reproducing head
    Publication number: 20020044390
    Abstract: A magnetoresistive effect type reproducing head includes a lower magnetic shield made of magnetic material, an upper magnetic shield made of magnetic material, a magnetoresistive effect type element formed between the lower magnetic shield layer and the upper magnetic shield layer, a lower inter-layer insulating film formed between the magnetoresistive effect type element and the lower magnetic shield, and an upper inter-layer insulation film formed between the magnetoresistive effect type element and the upper magnetic shield. At least one of the lower and upper magnetic shields includes a first magnetic layer made of a first material having first electric resistivity and a second magnetic layer made of a second material having second electric resistivity higher than the first electric resistivity.
    Type: Application
    Filed: January 8, 2002
    Publication date: April 18, 2002
    Inventors: Shun-ichi Narumi, Hiroshi Fukui, Katsumi Hoshino, Katsuo Watanabe, Kazue Kudo, Moriaki Fuyama
  • Magnetoresistive effect type reproducing head and magnetic disk apparatus equipped with the reproducing head
    Patent number: 6337784
    Abstract: A magnetoresistive effect type reproducing head is formed by stacking a lower magnetic shield made of magnetic material, a lower inter-layer insulation film, a magnetoresistive effect type element for detecting magnetic field by using a magnetoresistive effect, an upper inter-layer insulation film, and an upper magnetic shield made of magnetic material, on a substrate in this order, wherein a resistivity of at least one of the lower and upper magnetic shields is more than 200 &mgr;&OHgr;·cm.
    Type: Grant
    Filed: December 27, 2000
    Date of Patent: January 8, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Shun-ichi Narumi, Hiroshi Fukui, Katsumi Hoshino, Katsuo Watanabe, Kazue Kudo, Moriaki Fuyama
  • Magnetoresistive effect type reproducing head and magnetic disk apparatus equipped with the reproducing head
    Patent number: 6317301
    Abstract: A magnetoresistive effect type reproducing head is formed by stacking a lower magnetic shield made of magnetic material, a lower inter-layer insulation film, a magnetoresistive effect type element for detecting a magnetic field by using a magnetoresistive effect, an upper inter-layer insulation film, and an upper magnetic shield made of magnetic material, on a substrate in this order, wherein the resistivity of at least one of the lower and upper magnetic shields is more than 200 &mgr;&OHgr;·cm.
    Type: Grant
    Filed: July 16, 1998
    Date of Patent: November 13, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Shun-ichi Narumi, Hiroshi Fukui, Katsumi Hoshino, Katsuo Watanabe, Kazue Kudo, Moriaki Fuyama
  • Magnetoresistive effect type reproducing head and magnetic disk apparatus equipped with the reproducing head
    Publication number: 20010024345
    Abstract: A magnetoresistive effect type reproducing head is formed by stacking a lower magnetic shield made of magnetic material, a lower inter-layer insulation film, a magnetoresistive effect type element for detecting magnetic field by using a magnetoresistive effect, an upper inter-layer insulation film, and an upper magnetic shield made of magnetic material, on a substrate in this order, wherein a resistivity of at least one of the lower and upper magnetic shields is more than 200 &mgr;&OHgr;·cm.
    Type: Application
    Filed: May 14, 2001
    Publication date: September 27, 2001
    Inventors: Shun-Ichi Narumi, Hiroshi Fukui, Katsumi Hoshino, Katsuo Watanabe, Kazue Kudo, Moriaki Fuyama
  • MAGNETORESISTIVE EFFECT TYPE REPRODUCTING HEAD AND MAGNETIC DISK APPARATUS EQUIPPED WITH THE REPRODUCING HEAD
    Publication number: 20010013998
    Abstract: A magnetoresistive effect type reproducing head is formed by stacking a lower magnetic shield made of magnetic material, a lower inter-layer insulation film, a magnetoresistive effect type element for detecting magnetic field by using a magnetoresistive effect, an upper inter-layer insulation film, and an upper magnetic shield made of magnetic material, on a substrate in this order, wherein a resistivity of at least one of the lower and upper magnetic shields is more than 200 &mgr;&OHgr;·cm.
    Type: Application
    Filed: July 16, 1998
    Publication date: August 16, 2001
    Inventors: SHUN-ICHI NARUMI, HIROSHI FUKUI, KATSUMI HOSHINO, KATSUO WATANABE, KAZUE KUDO, MORIAKI FUYAMA
  • Magnetoresistive effect type reproducing head and magnetic disk apparatus equipped with the reproducing head
    Publication number: 20010000682
    Abstract: A magnetoresistive effect type reproducing head is formed by stacking a lower magnetic shield made of magnetic material, a lower inter-layer insulation film, a magnetoresistive effect type element for detecting magnetic field by using a magnetoresistive effect, an upper inter-layer insulation film, and an upper magnetic shield made of magnetic material, on a substrate in this order, wherein a resistivity of at least one of the lower and upper magnetic shields is more than 200 &mgr;&OHgr;·cm.
    Type: Application
    Filed: December 27, 2000
    Publication date: May 3, 2001
    Inventors: Shun-ichi Narumi, Hiroshi Fukui, Katsumi Hoshino, Katsuo Watanabe, Kazue Kudo, Moriaki Fuyama