Patents by Inventor Ryohiko Kinoshita

Ryohiko Kinoshita 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 ester compound
    Patent number: 8669375
    Abstract: PROBLEM To provide an environmentally-friendly method for producing industrially an ester compound. SOLUTION The present invention is a method for producing an ester compound which comprises subjecting a carboxylic acid and an alcohol to dehydration-condensation reaction using an involatile acid catalyst and then removing the residual acid catalyst by bringing a weak basic substance into contact with the residual acid catalyst.
    Type: Grant
    Filed: October 23, 2012
    Date of Patent: March 11, 2014
    Assignee: Wako Pure Chemical Industries, Ltd.
    Inventors: Shigeaki Imazeki, Ryohiko Kinoshita
  • Process for producing ester compound
    Patent number: 8318964
    Abstract: Problem To provide an environmentally-friendly method for producing industrially an ester compound. Solution The present invention is a method for producing an ester compound which comprises subjecting a carboxylic acid and an alcohol to dehydration-condensation reaction using an involatile acid catalyst and then removing the residual acid catalyst by bringing a weak basic substance into contact with the residual acid catalyst.
    Type: Grant
    Filed: October 20, 2007
    Date of Patent: November 27, 2012
    Assignee: Wako Pure Chemical Industries, Ltd.
    Inventors: Shigeaki Imazeki, Ryohiko Kinoshita
  • PROCESS FOR PRODUCING ESTER COMPOUND
    Publication number: 20100324314
    Abstract: PROBLEM To provide an environmentally-friendly method for producing industrially an ester compound. SOLUTION The present invention is a method for producing an ester compound which comprises subjecting a carboxylic acid and an alcohol to dehydration-condensation reaction using an involatile acid catalyst and then removing the residual acid catalyst by bringing a weak basic substance into contact with the residual acid catalyst.
    Type: Application
    Filed: October 20, 2007
    Publication date: December 23, 2010
    Applicant: WAKO PURE CHEMICAL INDUSTRIES, LTD.
    Inventors: Shigeaki Imazeki, Ryohiko Kinoshita
  • Process for producing N,N-disubstituted p-phenylenediamine derivative sulfate
    Patent number: 5475140
    Abstract: 4-Amino-3-methyl-N-ethyl-N-(.beta.-hydroxyethyl)-aniline sulfate which is used particularly as a developer for color photography can be easily produced in high yield and high quality by nitrosating N-ethyl-N-(.beta.-hydroxyethyl)-m-toluidine by use of an alkyl nitrite in a homogeneous alcohol solution containing sulfuric acid in an amount of about 0.5 to about 1 mole per mole of N-ethyl-N-(.beta.-hydroxyethyl)-m-toluidine, and then reducing the nitrosation product in an aqueous alcohol solution after or without isolation of the nitrosation product.
    Type: Grant
    Filed: April 19, 1994
    Date of Patent: December 12, 1995
    Assignee: Wako Pure Chemical Industries, Ltd.
    Inventors: Takehiko Iritani, Ryohiko Kinoshita, Yoshiki Kametani