Patents by Inventor Takemi Sunaga

Takemi Sunaga 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).

  • 1,4-dihydropyridine derivatives
    Patent number: 5047543
    Abstract: A 1,4-dihydropyridine derivative represented by the formula ##STR1## wherein X is a hydrogen atom or an alkoxy group having 1 to 4 carbon atoms, A and B are the same or different and are each an alkylene group having 1 to 4 carbon atoms, and a pharmaceutically acceptable salt thereof are useful as the preventive and therapeutical agents of ischemic heart disease and hypertension.
    Type: Grant
    Filed: November 17, 1989
    Date of Patent: September 10, 1991
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Toshihisa Ogawa, Tomomi Ota, Shuichi Sato, Takemi Sunaga, Yoshiaki Watanabe, Katsuo Hatayama
  • 1,4-dihydropyridine derivatives
    Patent number: 4948899
    Abstract: A 1,4-dihydropyridine derivative represented by the formula ##STR1## wherein R.sup.1 is a hydrogen atom, an alkoxy group having 1 to 4 carbon atoms, a mercapto group, an alkylcarbonylthio group in which the alkyl group has 1 to 4 carbon atoms or a benzoylthio group, R.sup.2 is a mercapto group, an alkylcarbonylthio group in which the alkyl group has 1 to 4 carbon atoms, a benzoylthio group or a 2-cyanoethylthio group, A and B are the same or different and are each an alkylene group having 1 to 4 carbon atoms, and X is a hydrogen atom, a halogen atom, a nitro group or a trifluoromethyl group is disclosed. These compounds increase the therapeutic effect of drug-resistant cancers.
    Type: Grant
    Filed: August 24, 1989
    Date of Patent: August 14, 1990
    Assignee: Taisho Pharmaceutical Co., Ltd.
    Inventors: Toshihisa Ogawa, Tomomi Ota, Shuichi Sato, Takemi Sunaga, Yoshiaki Watanabe, Katsuo Hatayama