Patents by Inventor Nobutaka Izumichi

Nobutaka Izumichi 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).

  • Crystalline parahydroxybenzoic acid anhydride and process for preparing the same
    Patent number: 7304182
    Abstract: The present invention provides a process for preparing crystalline parahydroxybenzoic acid anhydride, comprising the step of precipitating and isolating parahydroxybenzoic acid in an aqueous solvent at a temperature equal to or above the transition temperature of parahydroxybenzoic acid.
    Type: Grant
    Filed: April 12, 2004
    Date of Patent: December 4, 2007
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Masaharu Kittaka
  • Crystal of p-hydroxybenzoic anhydride and process for producing the same
    Publication number: 20060264670
    Abstract: The present invention provides a process for preparing crystalline parahydroxybenzoic acid anhydride, comprising the step of precipitating and isolating parahydroxybenzoic acid in an aqueous solvent at a temperature equal to or above the transition temperature of parahydroxybenzoic acid.
    Type: Application
    Filed: April 12, 2004
    Publication date: November 23, 2006
    Inventors: Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Masaharu Kittaka
  • Process for dehydrating hydrous sodium beta-naphtholate
    Publication number: 20050043564
    Abstract: The present invention provides a process for dehydrating hydrous sodium ?-naphtholate comprising: the step of heating the hydrous sodium ?-naphtholate or a mixture of the hydrous sodium ?-naphtholate and ?-naphthol which comprises no more than 0.2 mole of ?-naphthol per one mole of sodium ?-naphtholate in a solvent at a temperature of 260-300° C. under an inert gas. The process makes it possible to dehydrate hydrous sodium ?-naphtholate thoroughly in a short time with less production of tarry components.
    Type: Application
    Filed: August 11, 2004
    Publication date: February 24, 2005
    Inventors: Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Akira Obata
  • Granule of parahydroxybenzoic acid or parahydroxybenzoic ester and process for producing the same
    Patent number: 6673962
    Abstract: Granular product of parahydroxybenzoic acid or its ester which exhibits well suppressed dusting and caking tendency and a process for preparing the product are provided. The granular product of parahydroxybenzoic acid or its ester according to the instant invention has an average particle size of equal to or more than 150 &mgr;m and a hardness of 10-3000 g. The granular product of the invention can be prepared by dry compressing powdery parahydroxybenzoic acid or its ester to give compressed material, pulverizing and classifying the material.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: January 6, 2004
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Masaharu Kittaka
  • Granule of parahydroxybenzoic acid or parahydroxybenzoic ester and process for producing the same
    Publication number: 20030160205
    Abstract: Granular product of parahydroxybenzoic acid or its ester which exhibits well suppressed dusting and caking tendency and a process for preparing the product are provided. The granular product of parahydroxybenzoic acid or its ester according to the instant invention has an average particle size of equal to or more than 150 &mgr;m and a hardness of 10-3000 g. The granular product of the invention can be prepared by dry compressing powdery parahydroxybenzoic acid or its ester to give compressed material, pulverizing and classifying the material.
    Type: Application
    Filed: December 18, 2002
    Publication date: August 28, 2003
    Inventors: Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Masaharu Kittaka
  • Granules of 2-hydroxynaphthalene-3-carboxylic acid and method for preparing the same
    Patent number: 6562998
    Abstract: Granular product of 2-hydroxynaphthalene-3-carboxylic acid with well-suppressed dusting tendency, and process for preparing the same is provided. Granular product of 2-hydroxynaphthalene-3-carboxylic acid having an average particle size of 150 &mgr;m or more and a hardness of 70-3000 g, and a process for preparing the same comprising the steps of dry compressing powdery 2-hydroxynaphthalene-3-carboxylic acid to give compressed material and pulverizing and classifying the same.
    Type: Grant
    Filed: June 26, 2001
    Date of Patent: May 13, 2003
    Assignee: Kabushiki Kaisha Ueno Seiyako Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Syungo Nara, Masaharu Kittaka
  • Crystal of 2-hydroxynaphthalene-3-carboxylic acid and process for the preparation thereof
    Patent number: 6403827
    Abstract: The present invention provides crystalline 2-hydroxynaphthalene-3-carboxylic acid (BON) characterized in that the average particle size is equal to or more than 157 &mgr;m and the proportion of the particles of which particle size is less than 74 &mgr;m is equal to or less than 14%. The crystalline composition of the present invention can be prepared by a process comprising the step of recrystallizing BON, especially at a high temperature, or by carrying out the acid precipitation step in the method for preparing BON at a high temperature.
    Type: Grant
    Filed: January 3, 2001
    Date of Patent: June 11, 2002
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo K.
    Inventors: Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Hiroyuki Kato