Patents by Inventor Jajime Utsunomiya

Jajime Utsunomiya 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).

  • Patent number: 7943223
    Abstract: An optical recording medium is provided which includes two or more information layers in which an Sb-based eutectic material is used as the material for a recording film of a translucent information layer. There is also provided a recording film material for the optical recording medium. The translucent information layer is configured to include a recording film formed of a phase change material SbxGeyInz containing Sb, Ge, and In in an atomic ratio of x:y:z, where 5?y?15 and 4?z?15 are satisfied. The recording film further includes Te in an atomic ratio of a, provided that x+y+z+a=100 and 4?a?15 are satisfied. An interface layer formed of a ZrO2—Cr2O3 film having a thickness of 2 nm or more and 10 nm or less is provided on the laser beam incident side of the recording film. When the compositional ratio of the ZrO2—Cr2O3 film is given by ZrO2:Cr2O3=B:C (mol %), 20?B?90, 10?C?80, and B+C=100 are satisfied.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: May 17, 2011
    Assignee: TDK Corporation
    Inventors: Hiroshi Shingai, Tatsuya Kato, Masanori Kosuda, Hiroshi Takasaki, Hideki Hirata, Jajime Utsunomiya