Patents by Inventor Keigo Nishino

Keigo Nishino 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).

  • Benzimidazole Derivatives
    Patent number: 4942245
    Abstract: Benzimidazole derivatives of the following formula, ##STR1## wherein R.sup.1 indicates hydrogen atom, lower alkyl group having carbon atoms of 1 to 6 or dimethylaminopropyl group, R.sup.2 indicates hydrogen atom or lower alkanoyl group having carbon atoms of 1 to 3, R.sup.3 indicates hydrogen atom, lower alkyl group having carbon atoms of 1 to 3 or lower alkanoyl group having carbon atoms of 1 to 3, X indicates sulfur atom, sulfinyl group, sulfonyl group, amino group or methylene group, A indicates alkylene group having carbon atoms of 1 to 12, which alkylene group may optionally be substituted by hydroxy group or lower alkyl group having carbon atoms of 1 to 3, --(CHR')N--CR".dbd.CR"--(CHR')M--, ##STR2## (in which R' and R" are each independently hydrogen atom, lower alkyl group having carbon atoms of 1 to 3 or hydroxy group, and n and m are equal to 0, 1, 2 or 3) and Y indicates oxygen atom or sulfur atom; their acid or alkali salts and hydrate thereof are useful as antiallergic agents.
    Type: Grant
    Filed: April 11, 1988
    Date of Patent: July 17, 1990
    Assignee: Kyorin Pharmaceutical Co., Ltd.
    Inventors: Kuniyoshi Masuzawa, Kyuya Okamura, Keigo Nishino, Mitsuo Ohashi, Katsuya Awano
  • Anti-rheumatic agent
    Patent number: 4735954
    Abstract: Novel anti-rheumatic agent containing 3-isobutyryl-2-isopropylpyrazolo[1,5-a]pyridine as an active ingredient.
    Type: Grant
    Filed: September 9, 1986
    Date of Patent: April 5, 1988
    Assignee: Kyorin Seiyaku Kabushiki Kaisha
    Inventors: Tsutomu Irikura, Keigo Nishino, Saburo Hara
  • Pyrazolo[1,5-a]pyridines and benzimidazoles, useful as antiallergic agents
    Patent number: 4680398
    Abstract: The present invention is concerned with certain novel anti-allergic agents and process for their preparation.
    Type: Grant
    Filed: January 30, 1986
    Date of Patent: July 14, 1987
    Assignee: Kyorin Pharmaceutical Co., Ltd.
    Inventors: Tsutomu Irikura, Keigo Nishino, Kyuya Okamura, Toshiya Ikeda
  • Anti-allergic methods using pyrazolo(1,5-A)pyridines
    Patent number: 4654349
    Abstract: The present invention concerns the pyrazolo[1,5-a]pyridine derivatives which are antiallergic agents, referred to as SRS-A release inhibitors, and useful for treatmetn of allergic diseases.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: March 31, 1987
    Assignee: Kyorin Pharmaceutical Co., Ltd.
    Inventors: Tsutomu Irikura, Keigo Nishino, Yoshio Nagatsu
  • Pyrazolo[1,5-a]pyridine derivatives and anti-allergic compositions containing them
    Patent number: 4578392
    Abstract: The present invention is concerned with certain novel pyrozolo[1,5-a]pyridine derivatives, which are prepared by various means. The compounds of the present invention are antiallergic agents, referred to as SRS-A antagonists, and useful for treatment of allergic diseases.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: March 25, 1986
    Assignee: Kyorin Pharmaceutical Co., Ltd.
    Inventors: Tsutomu Irikura, Keigo Nishino, Seigo Suzue, Toshiya Ikeda