Patents by Inventor Kasaharu Tamazawa

Kasaharu Tamazawa 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).

  • 1,3-dithietane-2-carboxylic acid penicillin and cephalosporin derivatives
    Patent number: RE33778
    Abstract: Substituted 1,3-dithietane-2-carboxylic acid derivatives useful as intermediates for the preparation of highly effective penicillin and cephalosporin derivatives and the preparation thereof.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: December 24, 1991
    Assignee: Yamanouchi Pharmaceutical Co., Ltd.
    Inventors: Masaru Iwanami, Tetsuya Maeda, Yoshinobu Nagano, Masaharu Fujimoto, Noriaki Nagano, Atsuki Yamazaki, Kasaharu Tamazawa, Kiyoshi Murase, Tadao Shibanuma