Patents by Inventor Toshifumi Asaka

Toshifumi Asaka 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).

  • Cephalosporin compounds
    Patent number: 4357470
    Abstract: Novel cephalosporin compounds having the general formula ##STR1## wherein X represents hydrogen atom or hydroxy group, and the non-toxic pharmacologically acceptable salts thereof are disclosed. These compounds are useful as antibacterial agents.
    Type: Grant
    Filed: April 23, 1981
    Date of Patent: November 2, 1982
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Yoshiaki Watanabe, Chihiro Yokoo, Toshifumi Asaka, Akira Onodera, Kaoru Sota, Jiro Sawada
  • Novel penicillin derivatives
    Patent number: 4190581
    Abstract: Novel penicillin derivatives of the formula ##STR1## and pharmaceutically acceptable salts thereof, wherein R is hydrogen or hydroxy, are produced by acylating ampicillin, amoxicillin or a salt thereof with 4-hydroxy-pyrazino[2,3-f]quinoline-3-carboxylic acid or its functional derivative. They have high anti-pseudomonas activity and other antibacterial activity against gram-positive and gram-negative bacteria, and are of extremely low toxicity.
    Type: Grant
    Filed: July 31, 1978
    Date of Patent: February 26, 1980
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Yoshiaki Watanabe, Chihiro Yokoo, Toshifumi Asaka, Jiro Sawada