Patents by Inventor Yu Yamakawa

Yu Yamakawa 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).

  • Plasma processing detection indicator using inorganic substance as a color-change layer
    Patent number: 10180392
    Abstract: The present invention provides a plasma treatment detection indicator including a color-changing layer that changes color by plasma treatment, exhibiting excellent heat resistance, with the gasification of the color-changing layer or the scattering of the fine debris of the color-changing layer caused by the plasma treatment being suppressed to such a degree as to not affect the electronic device properties. Specifically, the present invention provides a plasma treatment detection indicator including a color-changing layer that changes color by plasma treatment, the color-changing layer containing at least one metal element selected from the group consisting of Mo, W, Sn, V, Ce, Te, and Bi in the form of a simple substance and/or an inorganic compound containing at least one metal element selected from the group consisting of Mo, W, Sn, V, Ce, Te, and Bi.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: January 15, 2019
    Assignee: SAKURA COLOR PRODUCTS CORPORATION
    Inventors: Yu Yamakawa, Kazuhiro Uneyama, Keita Hishikawa, Masayuki Nishi, Masahiro Shimizu
  • PLASMA PROCESSING DETECTION INDICATOR USING INORGANIC SUBSTANCE AS A COLOR-CHANGE LAYER
    Publication number: 20170153174
    Abstract: The present invention provides a plasma treatment detection indicator including a color-changing layer that changes color by plasma treatment, exhibiting excellent heat resistance, with the gasification of the color-changing layer or the scattering of the fine debris of the color-changing layer caused by the plasma treatment being suppressed to such a degree as to not affect the electronic device properties. Specifically, the present invention provides a plasma treatment detection indicator including a color-changing layer that changes color by plasma treatment, the color-changing layer containing at least one metal element selected from the group consisting of Mo, W, Sn, V, Ce, Te, and Bi in the form of a simple substance and/or an inorganic compound containing at least one metal element selected from the group consisting of Mo, W, Sn, V, Ce, Te, and Bi.
    Type: Application
    Filed: April 22, 2015
    Publication date: June 1, 2017
    Applicant: SAKURA COLOR PRODUCTS CORPORATION
    Inventors: Yu Yamakawa, Kazuhiro Uneyama, Keita Hishikawa, Masayuki Nishi, Masahiro Shimizu