Patents by Inventor Hiroshi Kongoji

Hiroshi Kongoji 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 fabricating a silicon single-crystal ingot
    Patent number: 5762704
    Abstract: A silicon single-crystal ingot which is nearly uniform in quality over the entire length of the column portion can be obtained to produce high-quality single-crystal silicon with high product yield and has the bottom column portion having the property close to the properties of the top column portion and the middle column portion. The bottom portion does not vary in shape among product lots and can be reproduced in the same shape. The diameter D2 of the bottom portion 2 is controlled in such a manner that the outer surface of the bottom portion 2a on the column portion side has an inclination angle .theta. of 10 to 25 degrees with respect to the outer surface of the column portion 1 and extends to the outer surface of the column portion.
    Type: Grant
    Filed: February 13, 1996
    Date of Patent: June 9, 1998
    Assignees: Mitsubishi Materials Silicon, Mitsubishi Materials Corporation
    Inventors: Jun-ichi Matsubara, Yuji Miyake, Hiroshi Kongoji, Kouji Maeda