Patents by Inventor Ryuichi Iemura

Ryuichi Iemura 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).

  • Quinazoline derivative, processes for its production, and cerebral dysfunction remedying agent comprising it as active ingredient
    Patent number: 4877790
    Abstract: A quinazoline derivative represented by the following formula (I) ##STR1## or its pharmacologically acceptable acid addition salt and processes for production thereof. The quinazoline compound is used as a cerebral dysfunction remedying agent.
    Type: Grant
    Filed: December 15, 1987
    Date of Patent: October 31, 1989
    Assignee: Kanebo Limited
    Inventors: Ryuichi Iemura, Manabu Hori, Hiroshi Ohtaka, Takayuki Sukamoto, Hideaki Hara, Keizo Ito
  • 1-substituted-2-(piperazinyl or homopiperazinyl)-benzimidazole compounds and pharmaceutical composition
    Patent number: 4603130
    Abstract: Novel benzimidazole derivatives of the formula: ##STR1## wherein R.sup.1 is a lower alkyl group, a lower alkenyl group or a lower alkynyl group, R.sup.2 is hydrogen atom, a lower alkyl group or a lower hydroxyalkyl group, and n is 2 or 3, or a pharmaceutically acceptable acid addition salt thereof, which have potent antihistaminic activity with less toxicity and hence are useful as an antihistaminics, and a process for the preparation of the compounds, and a pharmaceutical composition useful as antihistaminics containing the compound as an essential active ingredient.
    Type: Grant
    Filed: March 28, 1984
    Date of Patent: July 29, 1986
    Assignee: Kanebo, Ltd.
    Inventors: Ryuichi Iemura, Tsuneo Kawashima, Toshikazu Fukuda, Keizo Ito, Takashi Nose, Goro Tsukamoto
  • Benzimidazole derivatives, process for the preparation thereof and pharmaceutical composition containing the same
    Patent number: 4430343
    Abstract: Novel benzimidazole derivatives of the formula: ##STR1## wherein R.sup.1 is an alkyl group having 1 to 3 carbon atoms, allyl group, propargyl group, or phenyl group; R.sup.2 is hydrogen atom or an alkyl group having 1 to 3 carbon atoms; and n is 2 or 3, or pharmaceutically acceptable acid addition salts thereof, which have excellent antihistaminic activities and are useful as antiallergics for various allergic diseases, and a process for the preparation thereof, and an antihistaminic composition containing the compound as an active ingredient.
    Type: Grant
    Filed: October 22, 1982
    Date of Patent: February 7, 1984
    Assignee: Kanebo, Ltd.
    Inventors: Ryuichi Iemura, Tsuneo Kawashima, Toshikazu Fukuda, Keizo Ito, Takashi Nose, Goro Tsukamoto