Patents by Inventor Syoichi Nakayama

Syoichi Nakayama 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).

  • Composite substrate plate for magnetic or optical disk and process for production thereof
    Patent number: 4673602
    Abstract: A composite substrate plate for a magnetic or optical disk, comprising a metal plate, an undercoat resin layer formed on one side or both sides of said metal plate, and a surface resin layer having a mirrorlike surface formed on said undercoat resin layer.
    Type: Grant
    Filed: June 5, 1985
    Date of Patent: June 16, 1987
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Syoichi Nakayama, Keita Inui, Setsuo Suzuki
  • Optical recording medium
    Patent number: 4576896
    Abstract: An optical recording medium comprising a transparent substrate of a synthetic resin and an information recording layer provided thereon, on which medium information can be optically written, read and erased by means of a laser light, wherein said transparent substrate consists essentially of a cast-cured product of an epoxy resin composition comprising an alicyclic epoxy resin, or a mixture of a major amount of an alicyclic epoxy resin and a minor amount of an aromatic epoxy resin, an organic polybasic acid anhydride, a curing-accelerator and an anti-discoloring agent.
    Type: Grant
    Filed: October 23, 1984
    Date of Patent: March 18, 1986
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Setsuo Suzuki, Morio Tsuge, Syoichi Nakayama