Patents by Inventor Nobuhiro Yonetani

Nobuhiro Yonetani 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).

  • Method for producing naphthalene carboxylic acid amide compound
    Patent number: 7531691
    Abstract: The present invention provides a method for producing a naphthalenecarboxylic acid amide compound represented by formula [1] comprising, reacting a naphthalenecarboxylic acid halide compound represented by formula [2] with ammonium acetate in a solvent having an ether bond. According to the method of the present invention, a naphthalene carboxylic acid amide compound can be obtained at high yield and at low cost.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: May 12, 2009
    Assignee: Ueno Fine Chemicals Industry, Ltd.
    Inventors: Hiroyuki Wakamori, Nobuhiro Yonetani
  • Naphthol derivative and charge control agent comprising the same
    Patent number: 7449608
    Abstract: The present invention provides a novel naphthol derivative represented by the following general formula (I). The novel naphthol derivative of the present invention is useful as a positively electrifiable charge control agent. The present invention further provides an electrophotographic toner comprising a charge control agent comprising the novel naphthol derivative represented by formula (I).
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: November 11, 2008
    Assignee: Ueno Fine Chemicals Industry, Ltd.
    Inventors: Ryuzo Ueno, Masaya Kitayama, Kenji Minami, Hiroyuki Wakamori, Nobuhiro Yonetani
  • Method for producing naphthalene carboxylic acid amide compound
    Publication number: 20080045720
    Abstract: The present invention provides a method for producing a naphthalenecarboxylic acid amide compound represented by formula [1] comprising, reacting a naphthalenecarboxylic acid halide compound represented by formula [2] with ammonium acetate in a solvent having an ether bond. According to the method of the present invention, a naphthalene carboxylic acid amide compound can be obtained at high yield and at low cost.
    Type: Application
    Filed: June 11, 2007
    Publication date: February 21, 2008
    Applicant: UENO FINE CHEMICALS INDUSTRY, LTD.
    Inventors: Hiroyuki Wakamori, Nobuhiro Yonetani
  • Charge controllers
    Patent number: 7169523
    Abstract: The present invention provides a safe charge control agent which exhibits an excellent negative chargeability and excellent dispersibility in and compatibility with binder resins, and is even applicable for col or toners. Specifically, the charge control agent consists of a naphthol derivative of formula [I]: and a salt thereof, and an electrophotographic toner comprising the agent are provided.
    Type: Grant
    Filed: April 18, 2003
    Date of Patent: January 30, 2007
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Masaya Kitayama, Kenji Minami, Hiroyuki Wakamori, Nobuhiro Yonetani
  • Alkylenebisnaphtol derivative and charge control agent which consists of the same
    Patent number: 7074536
    Abstract: The present invention provides an alkylenebisnaphthol derivative represented by formula [I]: and a salt thereof. The compound of the present invention has an excellent triboelectric charge property and useful as charge control agent for electrophotographic toners.
    Type: Grant
    Filed: July 30, 2002
    Date of Patent: July 11, 2006
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Masaya Kitayama, Kenji Minami, Hiroyuki Wakamori, Nobuhiro Yonetani
  • Method for preparing 2-hydroxy-6-ureidocarbonyl naphthalene derivative
    Patent number: 7030261
    Abstract: Disclosed is a method for preparing a 2-hydroxy-6-ureidocarbonyl naphthalene derivative. The method comprises the step of reacting 2-hydroxy-6-aminocarbonyl naphthalene and a isocyanate in an organic solvent at a temperature of 90–200° C. According to the present invention, 2-hydroxy-6-ureidocarbonyl naphthalene derivative can easily be obtained within relatively short time and high yield.
    Type: Grant
    Filed: February 3, 2005
    Date of Patent: April 18, 2006
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
    Inventors: Masaya Kitayama, Hiroyuki Wakamori, Nobuhiro Yonetani
  • Process for production of hydroxygbenzoic acids
    Publication number: 20060052632
    Abstract: The present invention provides a method for producing a hydroxybenzoic acid compound comprising, dehydrating a phenol compound and an alkaline metal compound to form the alkaline metal salt of the phenol compound and reacting the alkaline metal salt and carbon dioxide, wherein the dehydrating step is conducted by reacting the alkaline metal compound with an excess amount of the phenol compound at a temperature of 160° C. or above. According to the method of the present invention, the hydroxybenzoic acid compound can be obtained by simple steps with low cost without using an expensive aprotic polar organic solvent. The provided method can produce highly pure hydroxybenzoic acid compound comprising little by-products in high yield.
    Type: Application
    Filed: September 30, 2003
    Publication date: March 9, 2006
    Inventors: Ryuzo Ueno, Masaya Kitayama, Hiroyuki Wakamori, Nobuhiro Yonetani, Takaya Hisano
  • Method for preparing 2-hydroxy-6-ureidocarbonyl naphthalene derivative
    Publication number: 20050192442
    Abstract: Disclosed is a method for preparing a 2-hydroxy-6-ureidocarbonyl naphthalene derivative. The method comprises the step of reacting 2-hydroxy-6-aminocarbonyl naphthalene and a isocyanate in an organic solvent at a temperature of 90-200° C. According to the present invention, 2-hydroxy-6-ureidocarbonyl naphthalene derivative can easily be obtained within relatively short time and high yield.
    Type: Application
    Filed: February 3, 2005
    Publication date: September 1, 2005
    Inventors: Masaya Kitayama, Hiroyuki Wakamori, Nobuhiro Yonetani
  • Charge controllers
    Publication number: 20050147909
    Abstract: The present invention provides a safe charge control agent which exhibits an excellent negative chargeability and excellent dispersibility in and compatibility with binder resins, and is even applicable for col or toners. Specifically, the charge control agent consists of a naphthol derivative of formula [I]: and a salt thereof, and an electrophotographic toner comprising the agent are provided.
    Type: Application
    Filed: April 18, 2003
    Publication date: July 7, 2005
    Inventors: Ryuzo Ueno, Masaya Kitayama, Kenji Minami, Hiroyuki Wakamori, Nobuhiro Yonetani
  • Naphthol derivative and charge control agent comprising the same
    Publication number: 20050119487
    Abstract: The present invention provides a novel naphthol derivative represented by the following general formula (I). The novel naphthol derivative of the present invention is useful as a positively electrifiable charge control agent. The present invention further provides an electrophotographic toner comprising a charge control agent comprising the novel naphthol derivative represented by formula (I).
    Type: Application
    Filed: December 10, 2002
    Publication date: June 2, 2005
    Applicant: KABUSHIKI KAISHA UENO SEIYAKU OYO KENKYUJO
    Inventors: Ryuzo Ueno, Masaya Kitayama, Kenji Minami, Hiroyuki Wakamori, Nobuhiro Yonetani
  • Alkylenebisnaphtol derivatives and charge control agent comprising the same
    Publication number: 20040248026
    Abstract: The present invention provides an alkylenebisnaphthol derivative represented by formula [I]: 1
    Type: Application
    Filed: July 12, 2004
    Publication date: December 9, 2004
    Inventors: Ryuzo Ueno, Masaya Kitayama, Kenji Minami, Hiroyuki Wakamori, Nobuhiro Yonetani