Patents by Inventor Ichiro Hiramatsu

Ichiro Hiramatsu 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).

  • Magneto-optic memory device
    Patent number: 5305254
    Abstract: A magneto-optic memory device, such as a magneto-optic disk or magneto-optic card having a pair of opposed substrates at least one of which is transparent. Between the substrates is a magneto-optic memory layer made of a stack of dielectric film, a rear earth-transition metal alloy thin film, a dielectric film and a light reflecting film built on the surface of the transparent substrate opposed to the other substrate. An adhesive layer covers the memory layer and bonds the transparent substrate to the other substrate. Lastly, a metal nitride film interposed between the light reflecting film of the memory layer and the adhesive layer.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: April 19, 1994
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshiteru Murakami, Junichiro Nakayama, Ichiro Hiramatsu, Akira Takahashi, Kenji Ohta, Kazuo Van, Hiroyuki Katayama