Patents by Inventor Hirokazu Kugai

Hirokazu Kugai 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 preparing carbon cluster film having electrical conductivity
    Patent number: 5538763
    Abstract: A carbon cluster film has a precisely controlled stable electrical conductivity which does not deteriorate in a short period of time in air. Such a carbon cluster film having a stable electrical conductivity is formed by introducing an impurity into a thin film of fullerenes by ion implantation. The fullerenes include C.sub.60, C.sub.70 or the like.
    Type: Grant
    Filed: December 2, 1994
    Date of Patent: July 23, 1996
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Yoshinobu Ueba, Nobuyuki Okuda, Kengo Ohkura, Hirokazu Kugai
  • Carbon cluster film having electrical conductivity and method of preparing the same
    Patent number: 5380595
    Abstract: A carbon cluster film has a precisely controlled stable electrical conductivity which does not deteriorate in a short period of time in air. Such a carbon cluster film having a stable electrical conductivity is formed by introducing an impurity into a thin film of fullerenes by ion implantation. The fullerenes include C.sub.60, C.sub.70 or the like.
    Type: Grant
    Filed: October 20, 1992
    Date of Patent: January 10, 1995
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Yoshinobu Ueba, Nobuyuki Okuda, Kengo Ohkura, Hirokazu Kugai