Patents by Inventor Kengo Kagei

Kengo Kagei 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).

  • Hydantoin derivatives and medicines containing the same
    Patent number: 4874869
    Abstract: Novel hydantoin derivatives and salts thereof, the process for the preparation thereof, and medicines containing the same, wherein the hydantoin derivatives are represented by the general formula: ##STR1## wherein X.sub.1 and X.sub.2, which may be the same or different, mean independently hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group; Y means oxygen atom or sulfur atom, R.sub.1 and R.sub.2, which may be the same or different, mean independently hydrogen atom, a lower alkyl group or phenyl group, or the both may form a ring with a carbon atom which is combined with them, excluding the case wherein both R.sub.1 and R.sub.2 are hydrogen atom at the same time, and n means an integer of 0 or 1. The novel hydantoin derivatives and salts thereof have excellent effects for the treatment of the complications of the diabetes mellitus.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: October 17, 1989
    Assignee: Eisai Co., Ltd.
    Inventors: Kouichiro Ueda, Satoru Tanaka, Toshinobu Kunii, Kengo Kagei, Tadashi Sato, Hideki Ono, Issei Ohtsuka, Mayumi Kawase, Toshiharu Ohgoh, Tsuneo Wakabayashi
  • Hydantoin derivatives for treating complications of diabetes
    Patent number: 4780472
    Abstract: Hydantoin derivatives and salts thereof, the process for the preparation thereof, and medicines containing the same, wherein the hydantoin derivatives are represented by the general formula: ##STR1## wherein the substituents are defined hereinbelow. The hydantoin derivatives and salts thereof have excellent effects for the treamtment of the complications of the diabetes mellitus.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: October 25, 1988
    Assignee: Eisai Co., Ltd.
    Inventors: Kouichiro Ueda, Satoru Tanaka, Toshinobu Kunii, Kengo Kagei, Tadashi Sato, Hideki Ono, Issei Ohtsuka, Mayumi Kawase, Toshiharu Ohgoh, Tsuneo Wakabayashi
  • Treating complications of diabetes mellitus with hydantoin derivatives
    Patent number: 4540704
    Abstract: Novel hydantoin derivatives and salts thereof, the process for the preparation thereof, and medicines containing the same, wherein the hydantoin derivatives are represented by the general formula: ##STR1## wherein X.sub.1 and X.sub.2, which may be the same or different, independently represent a hydrogen atom, a halogen atom, a lower alkyl group or a lower alkoxy group; Y represents an oxygen atom or sulfur atom, R.sub.1 and R.sub.2, which may be the same or different, independently represent a hydrogen atom, a lower alkyl group or phenyl group, or both may form a ring with carbon atoms, excluding the case wherein both R.sub.1 and R.sub.2 are hydrogen atom, and n represents 0 or 1. The novel hydantoin derivatives and salts thereof have excellent effects for the treatment of the complications of diabetes mellitus.
    Type: Grant
    Filed: June 7, 1983
    Date of Patent: September 10, 1985
    Assignee: Eisai Co., Ltd.
    Inventors: Kouichiro Ueda, Satoru Tanaka, Toshinobu Kunii, Kengo Kagei, Tadashi Sato, Ono Hideki, Issei Ohtsuka, Mayumi Kawase, Toshiharu Ohgoh, Tsuneo Wakabayashi