Patents by Inventor Masao Doyama

Masao Doyama 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).

  • Preparation of carbonaceous semiconductor material
    Patent number: 6607676
    Abstract: Carbonaceous semiconductor material is prepared by heating an organic polymer to carbonize the polymer and incorporating into the carbonized polymer one or more hetero atoms such as those of Group II, III, IV, V and VI of the Periodic Table. Carbonaceous semiconductor material is also prepared by heating an organic polymer containing one or more of the hetero atoms until the hetero atom-containing polymer is carbonized.
    Type: Grant
    Filed: May 8, 2002
    Date of Patent: August 19, 2003
    Assignee: Ube Industries, Ltd.
    Inventors: Masao Doyama, Shigehiko Yamada
  • Preparation of carbonaceous semiconductor material
    Publication number: 20020130297
    Abstract: Carbonaceous semiconductor material is prepared by heating an organic polymer to carbonize the polymer and incorporating into the carbonized polymer one or more hetero atoms such as those of Group II, III, IV, V and VI of the Periodic Table. Carbonaceous semiconductor material is also prepared by heating an organic polymer containing one or more of the hetero atoms until the hetero atom-containing polymer is carbonized.
    Type: Application
    Filed: May 8, 2002
    Publication date: September 19, 2002
    Inventors: Masao Doyama, Shigehiko Yamada