Patents by Inventor Hirotaka Tagawa

Hirotaka Tagawa 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).

  • Publication number: 20200132355
    Abstract: In a gas supply device that supplies gas to a target space through a filter unit, the filter unit is composed of a filter box and an air filter housed in the filter box, and the air filter is a filter having a filter substrate made of a membrane filter and a fibrous coating layer covering a surface of the filter substrate through which air is sucked.
    Type: Application
    Filed: July 20, 2018
    Publication date: April 30, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Hirotaka TAGAWA, Kazuyasu MATSUI, Makoto IKEMIYA
  • Patent number: 9561502
    Abstract: A conductive polymer material which can achieve longer operating life by improving resistance stability at the time of performing continuous conduction, a method for producing the conductive polymer material, and an image forming device member are provided. A conductive polymer material containing a quaternary ammonium base incorporated in a main chain of a polymer material as an electrolyte cation, and an alkyl sulfate radical as an electrolyte anion.
    Type: Grant
    Filed: January 10, 2014
    Date of Patent: February 7, 2017
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Tadashi Nakajima, Hirotaka Tagawa
  • Patent number: 9535354
    Abstract: A conductive roller in which dripping of a water-based coating during the manufacture thereof is restrained, and a manufacturing method thereof. The conductive roller includes a shaft, at least one elastic layer formed on the outer periphery of the shaft and a surface layer formed on the outer peripheral surface of the elastic layer. The elastic layer is formed by using a coating for elastic layers containing a liquid absorbing agent, and the surface layer is formed by using a coating for surface layers. The method comprises forming an elastic layer by applying a coating for elastic layers containing a liquid absorbing agent on the outer periphery of the shaft and drying to form the elastic layer; and forming a surface layer by, after forming the elastic layer, applying a coating for surface layers on the formed elastic layer and drying to form the surface layer.
    Type: Grant
    Filed: December 15, 2010
    Date of Patent: January 3, 2017
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Hirotaka Tagawa, Junichi Takano, Izumi Yoshimura, Daijirou Sirakura
  • Publication number: 20150352542
    Abstract: A conductive polymer material which can achieve longer operating life by improving resistance stability at the time of performing continuous conduction, a method for producing the conductive polymer material, and an image forming device member are provided. A conductive polymer material containing a quaternary ammonium base incorporated in a main chain of a polymer material as an electrolyte cation, and an alkyl sulfate radical as an electrolyte anion.
    Type: Application
    Filed: January 10, 2014
    Publication date: December 10, 2015
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Tadashi NAKAJIMA, Hirotaka TAGAWA
  • Patent number: 9201337
    Abstract: A developing roller in which the decay rate of the surface potential is high and in which an image failure caused by the accumulation of electric charge does not occur is provided. The developing roller 10 includes a shaft 1, an elastic layer 2 supported on the outer periphery of the shaft, and at least one coating layer 3, 4 formed on the outer periphery of the elastic layer. The volume resistivity of a layer on the inner periphery side of the elastic layer and the coating layer is smaller than the volume resistivity of a layer on the outer periphery side, and the difference between the volume resistivities of the elastic layer and the coating layer positioned on the outermost periphery side is in the range of 2.8 to 4.3 (Log ?cm).
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: December 1, 2015
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Hirotaka Tagawa, Takayuki Sugimura
  • Patent number: 8932194
    Abstract: An electrically conductive roller which may easily obtain a desired surface roughness, and which has good setting property without problems such as high cost and compression set is provided. An electrically conductive roller 10 comprises a shaft 1, an elastic layer 2 supported on the periphery of the shaft and one surface layer 3 formed on the peripheral surface of the elastic layer 2. The elastic layer 2 is composed of a urethane foam in which the degree of swelling is not more than 120% with respect to the solvent used in the formation of the surface layer 3. The urethane foam preferably contains, as a polyol component, a polyester polyol having a hydroxyl value of 200 to 400 and 3 or more functional groups.
    Type: Grant
    Filed: May 8, 2008
    Date of Patent: January 13, 2015
    Assignee: Bridgestone Corporation
    Inventors: Hirotaka Tagawa, Kota Kawano, Takayuki Sugimura
  • Publication number: 20140126935
    Abstract: A developing roller in which the decay rate of the surface potential is high and in which an image failure caused by the accumulation of electric charge does not occur is provided. The developing roller 10 includes a shaft 1, an elastic layer 2 supported on the outer periphery of the shaft, and at least one coating layer 3, 4 formed on the outer periphery of the elastic layer. The volume resistivity of a layer on the inner periphery side of the elastic layer and the coating layer is smaller than the volume resistivity of a layer on the outer periphery side, and the difference between the volume resistivities of the elastic layer and the coating layer positioned on the outermost periphery side is in the range of 2.8 to 4.3 (Log ?km).
    Type: Application
    Filed: July 5, 2012
    Publication date: May 8, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Hirotaka Tagawa, Takayuki Sugimura
  • Patent number: 8711543
    Abstract: Provided is an electrifying roller which may be used in a contact electrification method, which may be manufactured more easily, and which may better prevent problems caused by an electrically conductive material.
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: April 29, 2014
    Assignee: Bridgestone Corporation
    Inventors: Junichi Takano, Hirotaka Tagawa, Izumi Egashira, Daijirou Sirakura
  • Patent number: 8642148
    Abstract: Provided is an electrifying roller which is manufactured more easily, and has a good electrical conduction property with a small amount of electrically conductive material. Provided are electrifying rollers (10, 20) comprising a shaft 1, an elastic layer 2 formed on the periphery of the shaft 1, and a surface layer 3 formed on the periphery surface of the elastic layer 2, wherein the elastic layer 2 is formed by an ultraviolet curing resin having a phosphoester group. It is preferred that the ultraviolet curing resin be made of a compound represented by the following Formula (1): (wherein R1 is represented by the following Formula (2): (CH2)m??(2) (where m is an integer from 1 to 10), R2 is represented by any one of the following Formulae (3) to (9): R3 is represented by any one of the following Formulae (10) to (12): (where r, s and t are an integer from 10 to 150), and n is an integer from 1 to 10).
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: February 4, 2014
    Assignee: Bridgestone Corporation
    Inventors: Izumi Egashira, Hirotaka Tagawa, Junichi Takano, Daijirou Sirakura
  • Patent number: 8550968
    Abstract: There is a developing roller having a low compression permanent strain without contaminating a photosensitive drum and deteriorating toners. The developing roller 1 comprises a shaft 2, an elastic layer 3 formed on an outer periphery of the shaft 2 and a surface coating layer 4 formed on an outer peripheral face of the elastic layer 3, in which the surface coating layer 4 comprises a urethane resin formed by crosslinking a lactone-modified polyol with a polyisocyanate. The urethane resin is preferable to be formed by crosslinking the lactone-modified polyol with two or more kinds of polyisocyanates.
    Type: Grant
    Filed: November 8, 2006
    Date of Patent: October 8, 2013
    Assignee: Bridgestone Corporation
    Inventors: Takayuki Sugimura, Kouta Kawano, Takuro Sugimoto, Hirotaka Tagawa
  • Patent number: 8401444
    Abstract: A developing roller which shows an excellent environmental performance and is free from occurrence of toner filming and toner leakage is provided. The developing roller 10 comprises a shaft 1, an elastic layer 2 supported on the outer periphery of the shaft 1, and a single surface layer 3 formed on the outer peripheral surface of the elastic layer 2. The elastic layer 2 comprises a polyurethane foam and the surface layer 3 comprises an aqueous polyurethane resin as a major component and further a water-dispersible silica and/or an aqueous silicone acrylic graft polymer. As the aqueous polyurethane resin, a UV curing resin may be preferably used.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: March 19, 2013
    Assignee: Bridgestone Corporation
    Inventors: Takayuki Sugimura, Kota Kawano, Hirotaka Tagawa
  • Publication number: 20120316045
    Abstract: Provided is a conductive roller in which dripping of a coating, in particular, a water-based coating during the manufacture thereof is restrained, and a manufacturing method thereof. Provided is a conductive roller including a shaft 1, at least one elastic layer 2 formed on the outer periphery of the shaft 1 and a surface layer 3 formed on the outer peripheral surface of the elastic layer 2. The elastic layer 2 is formed by using a coating for elastic layers containing a liquid absorbing agent, and the surface layer 3 is formed by using a coating for surface layers.
    Type: Application
    Filed: December 15, 2010
    Publication date: December 13, 2012
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Hirotaka Tagawa, Junichi Takano, Izumi Yoshimura, Daijirou Sirakura
  • Publication number: 20120129666
    Abstract: Provided is an electrifying roller which is manufactured more easily, and has a good electrical conduction property with a small amount of electrically conductive material. Provided are electrifying rollers (10, 20) comprising a shaft 1, an elastic layer 2 formed on the periphery of the shaft 1, and a surface layer 3 formed on the periphery surface of the elastic layer 2, wherein the elastic layer 2 is formed by an ultraviolet curing resin having a phosphoester group. It is preferred that the ultraviolet curing resin be made of a compound represented by the following Formula (1): (wherein R1 is represented by the following Formula (2): ?CH2?m??(2) (where m is an integer from 1 to 10), R2 is represented by any one of the following Formulae (3) to (9): R3 is represented by any one of the following Formulae (10) to (12): (where r, s and t are an integer from 10 to 150), and n is an integer from 1 to 10).
    Type: Application
    Filed: August 24, 2009
    Publication date: May 24, 2012
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Izumi Egashira, Hirotaka Tagawa, Junichi Takano, Daijirou Sirakura
  • Publication number: 20110249372
    Abstract: Provided is an electrifying roller which may be used in a contact electrification method, which may be manufactured more easily, and which may better prevent problems caused by an electrically conductive material. Provided is an electrifying roller (10), (20) of the present invention has a shaft (1), an elastic layer (2) formed on the periphery of the shaft (1), and a surface layer (3) formed on the periphery surface of the elastic layer (2), wherein the elastic layer (2) is formed by an ultraviolet curing resin, and the surface layer is formed by a heat curing resin. it is preferred that the thickness of said elastic layer (2) be 0.9 to 1.3 mm and that the shaft (1) be a hollow cylinder or solid cylinder made of metal.
    Type: Application
    Filed: August 24, 2009
    Publication date: October 13, 2011
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Junichi Takano, Hirotaka Tagawa, Izumi Egashira, Daijirou Sirakura
  • Publication number: 20110206414
    Abstract: Provided are a method of manufacturing an electrifying roller in which a highly precise electrifying roller can be manufactured at a low cost and with more ease and an electrifying roller manufactured by the method.
    Type: Application
    Filed: August 24, 2009
    Publication date: August 25, 2011
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Hirotaka Tagawa, Junichi Takano, Izumi Egashira, Daijirou Sirakura
  • Publication number: 20110124478
    Abstract: An electrically conductive roller which may easily obtain a desired surface roughness, and which has good setting property without problems such as high cost and compression set is provided. An electrically conductive roller 10 comprises a shaft 1, an elastic layer 2 supported on the periphery of the shaft and one surface layer 3 formed on the peripheral surface of the elastic layer 2. The elastic layer 2 is composed of a urethane foam in which the degree of swelling is not more than 120% with respect to the solvent used in the formation of the surface layer 3. The urethane foam preferably contains, as a polyol component, a polyester polyol having a hydroxyl value of 200 to 400 and 3 or more functional groups.
    Type: Application
    Filed: May 8, 2008
    Publication date: May 26, 2011
    Inventors: Hirotaka Tagawa, Kota Kawano, Takayuki Sugimura
  • Publication number: 20100189473
    Abstract: A developing roller which shows an excellent environmental performance and is free from occurrence of toner filming and toner leakage is provided. The developing roller 10 comprises a shaft 1, an elastic layer 2 supported on the outer periphery of the shaft 1, and a single surface layer 3 formed on the outer peripheral surface of the elastic layer 2. The elastic layer 2 comprises a polyurethane foam and the surface layer 3 comprises an aqueous polyurethane resin as a major component and further a water-dispersible silica and/or an aqueous silicone acrylic graft polymer. As the aqueous polyurethane resin, a UV curing resin may be preferably used.
    Type: Application
    Filed: July 14, 2008
    Publication date: July 29, 2010
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takayuki Sugimura, Kota Kawano, Hirotaka Tagawa
  • Publication number: 20070111874
    Abstract: There is a developing roller having a low compression permanent strain without contaminating a photosensitive drum and deteriorating toners. The developing roller 1 comprises a shaft 2, an elastic layer 3 formed on an outer periphery of the shaft 2 and a surface coating layer 4 formed on an outer peripheral face of the elastic layer 3, in which the surface coating layer 4 comprises a urethane resin formed by crosslinking a lactone-modified polyol with a polyisocyanate. The urethane resin is preferable to be formed by crosslinking the lactone-modified polyol with two or more kinds of polyisocyanates.
    Type: Application
    Filed: November 8, 2006
    Publication date: May 17, 2007
    Inventors: Takayuki Sugimura, Kouta Kawano, Takuro Sugimoto, Hirotaka Tagawa
  • Publication number: 20070037680
    Abstract: In a conductive roller comprising a metal shaft and an elastic layer formed thereon, the elastic layer contains a monovalent tetrafluoroborate.
    Type: Application
    Filed: August 8, 2006
    Publication date: February 15, 2007
    Inventors: Hirotaka Tagawa, Kouta Kawano