Patents by Inventor Seiichi Niwa

Seiichi Niwa 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).

  • Quaternary ammonium salts and use thereof as medicine
    Patent number: 5574054
    Abstract: Novel quaternary ammonium salts having utility in the medical field for treating gastrointestinal disorders.
    Type: Grant
    Filed: January 12, 1995
    Date of Patent: November 12, 1996
    Assignee: Zeria Pharmaceutical Co., Ltd.
    Inventors: Osamu Kitagawa, Katsuyuki Ishii, Seiichi Niwa, Sigeru Ueki, Masao Seiki