Patents by Inventor Eiichirou Kotoura

Eiichirou Kotoura 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 for melting semiconductor wafer raw material and crystal growing method for semiconductor wafer
    Patent number: 9103049
    Abstract: The crucible and the side heater are held in the respective initial positions, and the raw material is put into the crucible. These initial positions are positions where the crucible side surface is mainly heated by the side heater. When the side heater heats the crucible side surface, the raw material is melted to form melt. When a part or all of the raw material is melted, the crucible is raised from the initial position or the side heater is lowered from the initial position. At this time, the position of the crucible or the side heater is adjusted such that the amount of heat applied to the lower side curved portion of the crucible side surface is greater than that in the initial relative position between the crucible and the side heater.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: August 11, 2015
    Assignee: SUMCO TECHXIV KABUSHIKI KAISHA
    Inventors: Koichi Shimomura, Eiichirou Kotoura, Hiroyuki Ohta
  • Method for melting semiconductor wafer raw material and crystal growing method for semiconductor wafer
    Publication number: 20080011222
    Abstract: The crucible and the side heater are held in the respective initial positions, and the raw material is put into the crucible. These initial positions are positions where the crucible side surface is mainly heated by the side heater. When the side heater heats the crucible side surface, the raw material is melted to form melt. When a part or all of the raw material is melted, the crucible is raised from the initial position or the side heater is lowered from the initial position. At this time, the position of the crucible or the side heater is adjusted such that the amount of heat applied to the lower side curved portion of the crucible side surface is greater than that in the initial relative position between the crucible and the side heater.
    Type: Application
    Filed: July 10, 2007
    Publication date: January 17, 2008
    Applicant: Sumco Techxiv Kabushiki Kaisha
    Inventors: Koichi Shimomura, Eiichirou Kotoura, Hiroyuki Ohta