Patents by Inventor Hiroyo Kawafuchi

Hiroyo Kawafuchi 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).

  • Quinolonecarboxylic acid derivatives or salts thereof
    Patent number: 6335447
    Abstract: Novel quinolonecarboxylic acid derivatives of general formula (1) or salts thereof which have potent antibacterial effects on gram-positive bacteria in particular Propionibacterium acnes (wherein R1 represents a hydrogen atom or a carboxyl-protective group; R2 represents an optionally substituted cycloalkyl group; R3 represents a hydrogen atom, a halogen atom, an optionally substituted alkyl, alkoxy or alkylthio group, an optionally protected hydroxyl or amino group, or a nitro group; R4 represents an optionally substituted alkyl or alkoxy group; and Z represents a pyridin-4-yl or pyridin-3-yl group which is optionally substituted with at least one group selected from a halogen atom, an optionally substituted alkyl, alkenyl, cycloalkyl, alkoxy, alkylthio or amino group and an optionally protected hydroxyl or amino group).
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: January 1, 2002
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Kazuya Hayashi, Tokunori Kito, Junichi Mitsuyama, Tetsumi Yamakawa, Hiroshi Kuroda, Hiroyo Kawafuchi
  • 1,2-benzoisoxazole derivative or its salt and brain-protecting agent comprising the same
    Patent number: 5578627
    Abstract: This invention relates to a 1,2-benzoisoxazole derivative represented by the following general formula (I) or its salt: ##STR1##
    Type: Grant
    Filed: April 12, 1995
    Date of Patent: November 26, 1996
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Kenji Takeda, Nobuo Terashima, Joji Nakano, Hisashi Minami, Toyokazu Kobayashi, Kunikazu Furuhata, Tadakazu Takakura, Makoto Takata, Hiroyo Kawafuchi, Toru Hiraiwa
  • Piperazine derivative or its salt, process for producing the same and pharmaceutical composition comprising the same as active ingredient
    Patent number: 4948796
    Abstract: A piperazine derivative represented by the following formula or a salt thereof: ##STR1## which is useful for curing cerebro-vascular disease and post-cerebro-vascular disease.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: August 14, 1990
    Assignee: Toyama Chemical Co., Ltd.
    Inventors: Toru Hiraiwa, Kenji Takeda, Joji Nakano, Mineichi Sudani, Kunikazu Furuhata, Makoto Takata, Hiroyo Kawafuchi, Isao Watanabe