Patents by Inventor Nobuhito Ashikawa

Nobuhito Ashikawa 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 stabilizing aqueous pyrazoloacridone derivative solution
    Patent number: 6552198
    Abstract: An aqueous solution of a pyrazoloacridone compound or pharmaceutical salt is stabilized using an acid, placing the solution in a well-closed container, evacuating air in the container, and sealing the container.
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: April 22, 2003
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Yutaka Tomoda, Nobuhito Ashikawa, Yasuki Kato, Kunio Ito