Patents by Inventor Tooru Katsumata

Tooru Katsumata 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 manufacture of III-V group compound semiconductor single crystal
    Patent number: 4586979
    Abstract: A III-V group compound semiconductor single crystal is manufactured by a method which comprises adjusting the temperature of a fused layer of raw material for the crystal, based on the electric current signal flowing between a seed crystal and the fused layer of raw material for the crystal, the weight signal of the crystal, and the length signal of the crystal, to levels optimum for the growth of crystal during the contact of the seed crystal with the fused layer, during the formation of the shoulder part of the crystal, and during the formation of the barrel part of the crystal, respectively in the process of crystal growth.
    Type: Grant
    Filed: April 4, 1984
    Date of Patent: May 6, 1986
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Tooru Katsumata, Kazutaka Terashima, Hiroaki Nakajima, Tsuguo Fukuda