Patents by Inventor Keiko Tsuchiya

Keiko Tsuchiya 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: 4816341
    Abstract: In a magnetic recording medium comprising a base film and a magnetic layer formed on the base film, the base film has been plasma treated in an atmosphere consisting essentially of an inorganic gas containing N, H, and optionally O at frequencies in the range of 10 to 200 kHz. A perpendicular magnetizable metal thin film layer can be deposited on the plasma-treated surface of a resin substrate having a heat distortion temperature of at least 150.degree. C. without disturbance on the crystal structure of the layer.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: March 28, 1989
    Assignee: TDK Corporation
    Inventors: Masatoshi Nakayama, Haruyuki Morita, Yuichi Kubota, Keiko Tsuchiya
  • Magnetic recording medium
    Patent number: 4745031
    Abstract: In a magnetic recording medium of the hard disk type comprising a rigid substrate and a magnetic layer formed thereon, the substrate is plasma treated at frequencies in the range of 10 to 200 kHz in an inorganic gas containing O; N and H; and N, H and O.
    Type: Grant
    Filed: December 26, 1985
    Date of Patent: May 17, 1988
    Assignee: TDK Corporation
    Inventors: Masatoshi Nakayama, Haruyuki Morita, Yuichi Kubota, Keiko Tsuchiya
  • Magnetic sheet
    Patent number: 4741977
    Abstract: A magnetic sheet comprising a disk-shaped substrate and a magnetic layer is loaded in a magnetic sheet operating device, typically electronic camera comprising a magnetic head for performing recording and reproducing operations on the sheet while rotating the sheet. The magnetic layer is formed from a composition comprising a magnetic powder and a binder having a specified complex elastic modulus.
    Type: Grant
    Filed: August 14, 1986
    Date of Patent: May 3, 1988
    Assignee: TDK Corporation
    Inventors: Keiji Koga, Keiko Tsuchiya, Kazunori Tamazaki, Tsutomu Aoyama, Yuichi Kubota
  • Magnetic recording medium
    Patent number: 4699847
    Abstract: In a magnetic recording medium comprising a plastic base film and a magnetic layer, the base film is plasma treated at frequencies in the range of 10 kHz to 200 kHz in an inorganic gas containing at least 5% of oxygen. The magnetic layer is formed on the plasma treated base film by applying a magnetic composition of ferromagnetic fine particles dispersed in a plasticized binder compound comprising a radiation-sensitive modified resin in admixture with a radiation-sensitive modified flexible resin or prepolymer, oligomer or telomer thereof, and exposing the composition to radiation for crosslinking and polymerization.
    Type: Grant
    Filed: July 24, 1985
    Date of Patent: October 13, 1987
    Assignee: TDK Corporation
    Inventors: Masatoshi Nakayama, Haruyuki Morita, Yuichi Kubota, Keiko Tsuchiya
  • Magnetic recording medium
    Patent number: 4575475
    Abstract: In a magnetic recording medium comprising a plastic base film and a magnetic layer formed thereon, the base film is plasma treated at frequencies in the range of 10 kHz to 200 kHz in an inorganic gas such as argon and nitrogen and preferably, in an inorganic gas containing at least 5% of oxygen.
    Type: Grant
    Filed: July 10, 1984
    Date of Patent: March 11, 1986
    Assignee: TDK Corporation
    Inventors: Masatoshi Nakayama, Haruyuki Morita, Yuichi Kubota, Keiko Tsuchiya