Patents by Inventor Sadanobu Yoshikawa

Sadanobu Yoshikawa 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).

  • Process for producing quinoline-3-carboxylic acid compound
    Patent number: 6852862
    Abstract: A process for producing quinoline-3-carboxylic acid represented by formula wherein R1, R2, R3, R4 and R5 have the same meanings as defined below, characterized by reacting 2-aminophenyl ketone represented by formula (1) wherein R1 is an aryl group, a C1-12 alkyl group which may be branched, etc., and R2 and R3 are each a hydrogen atom, a halogen atom, a C1-12 alkyl group which may be branched, etc., with a keto ester represented by formula (2) R4COCH2CO2R5??(2) wherein R4 is a C1-12 alkyl group which may be branched, a C3-6 cycloalkyl group, etc., and R5 is a C1-6 alkyl group which may be branched, in the presence of an acid catalyst in an alcohol solvent while distilling off the alcohol.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: February 8, 2005
    Assignees: Sumika Fine Chemicals Co., Ltd., Nissan Chemical Industries, Ltd.
    Inventors: Susumu Nishizawa, Sadanobu Yoshikawa
  • Process for producing quinoline-3-carboxylic acid compound
    Publication number: 20040073034
    Abstract: A process for producing quinoline-3-carboxylic acid represented by formula 1
    Type: Application
    Filed: September 24, 2003
    Publication date: April 15, 2004
    Inventors: Susumu Nishizawa, Sadanobu Yoshikawa
  • Anhydrous mirtazapine and process for preparing the same
    Patent number: 6660730
    Abstract: Methods for producing anhydrous mirtazapine crystals that are either (1) substantially free of lower alcohol insolubles or (2) substantially free of residual solvent and have an average particle diameter of from 10 to 50 &mgr;m, are provided, and the resulting anhydrous mirtazapine crystals produced thereby, which are useful in pharmaceuticals.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: December 9, 2003
    Assignee: Sumika Fine Chemicals Co., Ltd.
    Inventors: Chiharu Maeda, Sadanobu Yoshikawa, Eiichi Iishi
  • Anhydrous mirtazapine and process for preparing the same
    Publication number: 20020065413
    Abstract: Methods for producing anhydrous mirtazapine crystals that are either (1) substantially free of lower alcohol insolubles or (2) substantially free of residual solvent and have an average particle diameter of from 10 to 50 &mgr;m, are provided, and the resulting anhydrous mirtazapine crystals produced thereby, which are useful in pharmaceuticals.
    Type: Application
    Filed: April 27, 2001
    Publication date: May 30, 2002
    Applicant: Sumika Fine Chemicals Co., Ltd.
    Inventors: Chiharu Maeda, Sadanobu Yoshikawa, Eiichi Iishi