Patents by Inventor Hiroshi Yamashima

Hiroshi Yamashima 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).

  • Method of and apparatus for manufacturing single crystal compound semiconductor
    Patent number: 3986837
    Abstract: Method of and apparatus for manufacturing a single crystal compound semiconductor in a boat, whereby the melt forming the crystal is maintained at a higher temperature at its surface in contact with the bottom of the boat, than at its free surface in order that solidification of the melt begins at its free surface. Uniform crystallinity without structural defects or impurities is obtained.
    Type: Grant
    Filed: March 7, 1974
    Date of Patent: October 19, 1976
    Assignee: Nikkei Kako Kabushiki Kaisha
    Inventors: Seiji Sugiyama, Hiroshi Yamashima