Patents by Inventor Takayoshi Kobuke

Takayoshi Kobuke 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: 5472778
    Abstract: A magnetic recording medium having a magnetic layer in the form of a ferromagnetic metal thin film includes an undercoat film disposed between the magnetic layer and the substrate and a topcoat film on the magnetic layer. Each of the undercoat and topcoat films is a plasma polymerized film containing silicon, the Si content in the film being 30 to 50 at %. Corrosion resistance and durability are significantly improved.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: December 5, 1995
    Assignee: TDK Corporation
    Inventors: Kunihiro Ueda, Takayoshi Kobuke
  • Optical magnetic recording medium
    Patent number: 4777082
    Abstract: In an optical recording medium comprising a substrate and a recording layer thin film comprised of a rare earth element and a transition metal, for example, TbFeCo on the substrate, a metal thin film layer having a high magnetic permeability, for example, Permalloy is formed on the recording layer. A transparent dielectric film layer may be formed between the substrate and the recording layer thin film.
    Type: Grant
    Filed: August 17, 1987
    Date of Patent: October 11, 1988
    Assignee: TDK Corporation
    Inventors: Hideki Ishizaki, Takayoshi Kobuke, Suguru Takayama
  • 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: 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: 4418126
    Abstract: A magnetic recording medium comprises a thin metallic magnetic layer on a non-magnetic substrate wherein said thin metallic magnetic layer is made of cobalt, nickel and chromium.
    Type: Grant
    Filed: July 15, 1981
    Date of Patent: November 29, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Toshiaki Izumi, Yasuta Taketomi, Takayoshi Kobuke
  • Magnetic recording media and process of producing them
    Patent number: 4400444
    Abstract: A magnetic recording medium having a ferromagnetic layer formed by oblique vapor deposition wherein the residual magnetic flux density in the width direction of the recording medium is larger than the residual magnetic flux density in the longitudinal direction shows the SN ratio in a practical level at recording in the width direction.
    Type: Grant
    Filed: June 3, 1982
    Date of Patent: August 23, 1983
    Assignee: TDK Electronics Co., Ltd.
    Inventors: Toshiaki Izumi, Fumio Maruta, Takayoshi Kobuke, Kiyoshi Noguchi
  • Process for producing magnetic particles for magnetic recording medium
    Patent number: 4348430
    Abstract: A process for producing magnetic particles for a magnetic recording medium from an acicular goethite as a starting material comprises a step of growing a Si-component-containing goethite as an outer layer.
    Type: Grant
    Filed: November 26, 1980
    Date of Patent: September 7, 1982
    Assignee: TDK Electronics Company, Ltd.
    Inventors: Yasumichi Tokuoka, Takayoshi Kobuke
  • 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