Patents by Inventor Tomohisa Machida

Tomohisa Machida 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 material auxiliary melting apparatus and single crystal material melting method
    Patent number: 6361597
    Abstract: The present invention aims to improve thermal efficiency and to reduce melting time when a raw material in an auxiliary crucible is heated and melted by induction heating method. When an initial raw material 30a is at low temperature and its conductivity is relatively low, a conductive carbon cylinder 2 is arranged at such a height as to cover the entire side wall of the auxiliary crucible 1, and when high frequency current is applied on a high frequency coil 3, secondary induction current is generated on the carbon cylinder 2. Then, Joule heat is generated on the carbon cylinder 2 by the secondary induction current, and heat of the carbon cylinder 2 is transmitted to the raw material inside via the auxiliary crucible 1. Thus, the raw material is heated, and melting is started. When the raw material is melted, an insulating ceramic base 4 is arranged at such a position as to cover the entire side wall of the auxiliary crucible 1.
    Type: Grant
    Filed: November 5, 1999
    Date of Patent: March 26, 2002
    Assignee: Super Silicon Crystal Research Institute Corp.
    Inventors: Nobumitsu Takase, Tomohisa Machida, Yutaka Shiraishi