Patents by Inventor Akio Kusaura

Akio Kusaura 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 disc with inhibited thermal distortion
    Patent number: 4877667
    Abstract: An optical disc in which distortion due to temperature change is inhibited has a magnetic positioning disc 3 of specified diameter mounted at the center of the disc substrate 1 having an information recording layer 2 on a specified radial area. The positioning disc is bonded to the disc substrate by an element(s) made of a material whose thermal expansion coefficient is almost equivalent to that of the disc substrate.
    Type: Grant
    Filed: March 4, 1988
    Date of Patent: October 31, 1989
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Michinobu Hattori, Hidemitsu Fujisawa, Akio Kusaura
  • Optical disk storage
    Patent number: D306286
    Type: Grant
    Filed: June 26, 1987
    Date of Patent: February 27, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masaharu Sawatani, Akio Kusaura