Patents by Inventor Seitoku Saito

Seitoku Saito 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).

  • Magnetic recording medium
    Patent number: 4588654
    Abstract: A magnetic recording medium having a subbing metal layer formed by sputtering under a thin magnetic layer formed by vapor deposition possesses excellent magnetic properties and high surface hardness. The presence of the subbing layer improves the adhesion of the thin magnetic layer to the support.
    Type: Grant
    Filed: May 27, 1982
    Date of Patent: May 13, 1986
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Takayoshi Kobuke, Toshiaki Izumi, Seitoku Saito, Kazumasa Fukuda
  • Magnetic recording medium
    Patent number: 4563396
    Abstract: A magnetic recording medium having a Mn-Al recording layer containing at least one of Fe, Co, and Ni and having an easy magnetization axis in the perpendicular direction to the layer. The magnetic recording layer can be formed at a high speed by employing magnetron sputtering.
    Type: Grant
    Filed: June 3, 1982
    Date of Patent: January 7, 1986
    Assignee: TDK Electronics Company Ltd.
    Inventors: Kazumasa Fukuda, Seitoku Saito
  • Magnetic recording medium
    Patent number: 4542062
    Abstract: A magnetic recording medium comprises a magnetic alloy layer on a substrate wherein said magnetic alloy layer is made of 70-90 wt. % of Co and 30-10 wt. % of at least one of Si, Sb, Li, V, Ta, Ge and Pt and a magnetization axis of said magnetic alloy is substantially vertical to said layer.
    Type: Grant
    Filed: January 20, 2982
    Date of Patent: September 17, 1985
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Kazuo Takada, Seitoku Saito
  • Magnetic recording medium
    Patent number: 4520076
    Abstract: A magnetic recording medium has plural magnetic layers on a non-magnetic substrate. The magnetic particles are orientated in substantially the same tilt direction for major axes of the particles in each magnetic layer and in cross tilt directions for major axes of the particles in the adjacent magnetic layers.
    Type: Grant
    Filed: May 14, 1981
    Date of Patent: May 28, 1985
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Seitoku Saito, Toshiaki Izumi, Takayoshi Kobuke, Hiroshi Sugihara
  • Magnetic recording medium
    Patent number: 4486498
    Abstract: A magnetic recording medium comprises cobalt as a main component and at least one of zinc, rhodium and iridium as an additional component of an alloy of a magnetic layer.
    Type: Grant
    Filed: September 1, 1983
    Date of Patent: December 4, 1984
    Assignee: TDK Electronics Co., Ltd.
    Inventor: Seitoku Saito
  • Magnetic recording medium
    Patent number: 4416943
    Abstract: A magnetic recording medium comprises cobalt as a main component and at least one of zinc, rhodium and iridium as an additional component of an alloy of a magnetic layer.
    Type: Grant
    Filed: July 23, 1981
    Date of Patent: November 22, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventor: Seitoku Saito
  • Magnetic recording medium
    Patent number: 4396668
    Abstract: A magnetic recording medium obtained by coating a magnetic metallic powder with a binder on a non-magnetic substrate, wherein said magnetic metallic powder is mainly made of acicular particles obtained by a dry reduction process and said magnetic recording medium has a residual magnetic flux density of greater than 2,600 gauss, a coercive force of 1,300 to 1,800 Oe, a thickness of a magnetic layer of 1.5 to 3.5 .mu.m and a C/N ratio (carrier signal/noise level) in video band of greater than 4 dB of the C/N ratio of the standard video tape.
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: August 2, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Seitoku Saito, Hideo Kobayashi
  • Magnetic recording medium and apparatus for preparing the same
    Patent number: 4387136
    Abstract: A thin metallic layer type magnetic recording medium having thin metallic layers in a structure comprises a layer in which a tilt angle of a metallic particle direction to the normal line to said substrate gradually increases depending upon an increase of a distance from said substrate; and a layer in which a tilt angle of a metallic particle direction to the normal line to said substrate gradually decreases depending upon an increase of a distance from said substrate.
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: June 7, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Seitoku Saito, Fumio Maruta, Toshiaki Izumi, Hiroshi Sugihara
  • Magnetic recording medium with stepwise orientation of deposited metallic particles
    Patent number: 4371590
    Abstract: A magnetic recording medium having multi-layer structure of two or more thin metallic layers on a substrate. The orientations of metallic particles are different for each of said thin metallic layers.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: February 1, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Toshiaki Izumi, Seitoku Saito, Fumio Maruta, Minoru Kameya
  • Process for preparing magnetic recording medium
    Patent number: 4343834
    Abstract: A magnetic recording medium is prepared by a tilt vapor deposition of magnetic particles from a vapor thereof on a substrate running along a peripheral surface of a cylindrical can in vacuum wherein plural cans are used to deposit said magnetic particles at substantially the same tilt angle on each of said cans.
    Type: Grant
    Filed: March 26, 1981
    Date of Patent: August 10, 1982
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Seitoku Saito, Toshiaki Izumi, Hiroshi Sugihara, Takayoshi Kobuke, Kazuo Takada