Patents by Inventor Katsuhito Makiyama

Katsuhito Makiyama 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).

  • Single crystal pulling apparatus
    Patent number: 6689213
    Abstract: To impart flexibility suitable for recovery of a quartz crucible to a divided type graphite crucible and avoid damage to the quartz crucible due to the flexibility. A graphite crucible 10 is divided into two or more parts by radial dividing lines 14. An opening 11a is provided in a center of a bottom of the graphite crucible 10. A protrusion 21 fitting into the opening 11a is provided on a crucible placing surface of a crucible tray 20. An inner diameter d2 of the opening 11a is 0.04 to 0.9 times an inner diameter d1 of a straight body portion of the graphite crucible 10. An outer diameter D2 of the crucible tray 20 is 0.5 or more times an outer diameter D1 of the straight body portion of the graphite crucible 10. Minimum thickness of the crucible tray 20 is 15 mm or more.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: February 10, 2004
    Assignee: Sumitomo Mitsubishi Silicon Corporation
    Inventors: Takayuki Kubo, Katsuhito Makiyama, Tatsuya Yabusame
  • Single crystal pulling apparatus
    Publication number: 20020170492
    Abstract: To impart flexibility suitable for recovery of a quartz crucible to a divided type graphite crucible and avoid damage to the quartz crucible due to the flexibility. A graphite crucible 10 is divided into two or more parts by radial dividing lines 14. An opening 11a is provided in a center of a bottom of the graphite crucible 10. A protrusion 21 fitting into the opening 11a is provided on a crucible placing surface of a crucible tray 20. An inner diameter d2 of the opening 11a is 0.04 to 0.9 times an inner diameter d1 of a straight body portion of the graphite crucible 10. An outer diameter D2 of the crucible tray 20 is 0.5 or more times an outer diameter D1 of the straight body portion of the graphite crucible 10. Minimum thickness of the crucible tray 20 is 15 mm or more.
    Type: Application
    Filed: March 13, 2002
    Publication date: November 21, 2002
    Inventors: Takayuki Kubo, Katsuhito Makiyama, Tatsuya Yabusame