Patents by Inventor Tsutomu Asaka

Tsutomu Asaka 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).

  • Optical magnetic recording member
    Patent number: 4683176
    Abstract: An optical magnetic recording member comprising a perpendicular-type magnetic film which is provided on a reflection film, and is made of a mixture of a ferromagnetic metal Me and a dielectric material.
    Type: Grant
    Filed: August 15, 1984
    Date of Patent: July 28, 1987
    Assignee: Nihonshinku Gijutsu Kabushiki Kaisha
    Inventors: Kyuzo Nakamura, Yoshifumi Ota, Tsutomu Asaka
  • Optical magnetic recording member
    Patent number: 4661420
    Abstract: An enhancement of the Kerr rotation angle is obtained in a magnetic recording member by providing an amorphous layer of Si, Ge, or alloy thereof. Such layer may further contain any of the following additional elements: H, C, F, N and O.
    Type: Grant
    Filed: February 5, 1985
    Date of Patent: April 28, 1987
    Assignee: Nihon Shinku Gijutsu Kabushiki Kaisha
    Inventors: Kyuzo Nakamura, Yoshifumi Ota, Shin Asari, Tsutomu Asaka