Patents by Inventor Kazukyuki Sugahara

Kazukyuki Sugahara 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).

  • Vertical type MOS transistor and method of formation thereof
    Patent number: 5017504
    Abstract: A vertical MOS transistor having its channel length determined by the thickness of an insulating layer provided over a semiconductor substrate, rather than by the depth of a trench in which the transistor is formed. As a result, the characteristics of the transistor as relatively unaffected by doping and heat-treatment steps which are performed during formation. Also, the transistor may be formed so as to occupy very little surface area, making it suitable for application in high-density DRAMs.
    Type: Grant
    Filed: April 21, 1989
    Date of Patent: May 21, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tadashi Nishimura, Kazukyuki Sugahara, Shigeru Kusunori, Akihiko Ohsaki