Patents by Inventor Takuji Kakigami

Takuji Kakigami 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).

  • Glycyrrhetinic acid derivatives
    Patent number: 5356880
    Abstract: The invention provides a novel glycoside which contains as the aglycon a 4-(substituted phenyl)piperazine-1-yl derivative of glycyrrhetinic acid and 11-deoxo-glycyrrhetinic acid or their derivative as well as a composition for the treatment of virus infection, which contains these compounds as a main active component.
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: October 18, 1994
    Assignee: Sanwa Kagaku Kenkyusho Co., Ltd.
    Inventors: Masayasu Kurono, Yoshiro Ishiwata, Syoji Yokochi, Kyoichi Asano, Takahiko Mitani, Takuji Kakigami, Noriyuki Iwata, Kougaku Isogawa, Yutaka Baba, Hiroyuki Ohwaki, Kiichi Sawai, Hiromoto Kimura, Masato Fukushima, Ryoichi Unno, Tamaki Ohtuka
  • Process for the preparation of optically active 4-oxo-1-benzopyran-2-carboxylic acid derivatives and intermediates thereof
    Patent number: 5171865
    Abstract: A process for the preparation of optically active 4-oxo-1-benzopyran-2-carboxylic acid derivatives of the formula ##STR1## wherein X and Y are hydrogen atom, halogen atom or alkyl group, and R.sub.1 is hydrogen atom or alkyl group,intermediates thereof, as well as a process for the preparation of the intermediates.
    Type: Grant
    Filed: March 5, 1991
    Date of Patent: December 15, 1992
    Assignee: Sanwa Kagaku Kenkyusho Co., Ltd.
    Inventors: Masayasu Kurono, Yasuaki Kondo, Kenji Miura, Toshinao Usui, Ryoichi Unno, Takuji Kakigami, Kiichi Sawai