Patents by Inventor Kazaharu Tamazawa

Kazaharu 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: 4414153
    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: September 23, 1981
    Date of Patent: November 8, 1983
    Assignee: Yamanouchi Pharmaceutical Co. Ltd.
    Inventors: Masaru Iwanami, Tetsuya Maeda, Yoshinobu Nagano, Masaharu Fujimoto, Noriaki Nagano, Atsuki Yamazaki, Kazaharu Tamazawa, Kiyoshi Murase, Tadao Shibanuma
  • 1,3-Dithietane-2-carboxylic acids and the preparation thereof
    Patent number: 4198339
    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: June 7, 1978
    Date of Patent: April 15, 1980
    Assignee: Yamanouchi Pharmaceutical Co., Ltd.
    Inventors: Masaru Iwanami, Tetsuya Maeda, Yoshinobu Nagano, Masaharu Fujimoto, Noriaki Nagano, Atsuki Yamazaki, Kazaharu Tamazawa, Kiyoshi Murase, Tadao Shibanuma