Patents by Inventor Naka Hirayama

Naka Hirayama 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).

  • Patent number: 7776935
    Abstract: A method for preparing a silicone elastomer porous material includes the steps of (1) providing a water-in-oil emulsion including a liquid silicone rubber material which forms a silicone elastomer upon curing, a silicone oil material that has a surface activation function, and water droplets dispersed in the liquid silicone rubber material, (2) subjecting the emulsion to a primary heating, thereby curing the liquid silicone rubber material to form a silicone elastomer and confining the water droplets within the silicone elastomer substantially as they are present in the emulsion, and (3) subjecting the silicone elastomer to a secondary heating, thereby evaporating and removing the water droplets from the silicone elastomer, thereby forming the silicone elastomer porous material.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: August 17, 2010
    Assignee: Nitto Kogyo Co., Ltd.
    Inventors: Naka Hirayama, Atsushi Ikeda
  • Patent number: 7285578
    Abstract: A water-in-oil emulsion composition for forming a silicone elastomer porous material contains a liquid silicone rubber material which forms a silicone elastomer upon curing, a silicone oil material which has a surface activation function, and water.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: October 23, 2007
    Assignee: Nitto Kogyo Co., Ltd.
    Inventors: Naka Hirayama, Atsushi Ikeda
  • Publication number: 20070179209
    Abstract: A method for preparing a silicone elastomer porous material includes the steps of (1) providing a water-in-oil emulsion including a liquid silicone rubber material which forms a silicone elastomer upon curing, a silicone oil material that has a surface activation function, and water droplets dispersed in the liquid silicone rubber material, (2) subjecting the emulsion to a primary heating, thereby curing the liquid silicone rubber material to form a silicone elastomer and confining the water droplets within the silicone elastomer substantially as they are present in the emulsion, and (3) subjecting the silicone elastomer to a secondary heating, thereby evaporating and removing the water droplets from the silicone elastomer, thereby forming the silicone elastomer porous material.
    Type: Application
    Filed: April 5, 2007
    Publication date: August 2, 2007
    Applicant: NITTO KOGYO CO., LTD
    Inventors: Naka Hirayama, Atsushi Ikeda
  • Patent number: 7007384
    Abstract: A method of producing a developing roller, includes providing a roller core having an electrically conductive layer provided on a circumferential surface thereof, applying a reaction mixture containing a fluorine-containing polyol, an isocyanate compound, and a reactive silicone oil having an active hydrogen to a surface of the conductive layer, and subjecting the reaction mixture to a reaction condition for reacting the flourine-containing polyol and the reactive silicone oil with the isocyanate compound.
    Type: Grant
    Filed: August 16, 2002
    Date of Patent: March 7, 2006
    Assignee: Nitto Kogyo Co., Ltd.
    Inventor: Naka Hirayama
  • Publication number: 20050143480
    Abstract: A substantially closed-cell silicone elastomer porous body includes cells with diameters of 50 ?m or less, which occupy 50% or more of all the cells, and has a closed cell rate of 60% or more.
    Type: Application
    Filed: November 12, 2004
    Publication date: June 30, 2005
    Applicant: NITTO KOGYO CO., LTD
    Inventors: Naka Hirayama, Atsushi Ikeda
  • Publication number: 20050113461
    Abstract: A water-in-oil emulsion composition for forming a silicone elastomer porous material contains a liquid silicone rubber material which forms a silicone elastomer upon curing, a silicone oil material which has a surface activation function, and water.
    Type: Application
    Filed: November 12, 2004
    Publication date: May 26, 2005
    Applicant: NITTO KOGYO CO., LTD.
    Inventors: Naka Hirayama, Atsushi Ikeda
  • Patent number: 6685612
    Abstract: A developing roller has a roller core, an electrically conductive layer provided on a circumferential surface of the roller core, and a covering layer provided on the outer circumferential surface of the conductive layer. The covering layer is formed by subjecting a reaction mixture containing a fluorine-containing polyol, a reactive silicone oil having an active hydrogen, and an isocyanate compound, to a reaction condition for reacting the fluorine-containing polyol and the reactive silicone oil with the isocyanate compound.
    Type: Grant
    Filed: August 16, 2002
    Date of Patent: February 3, 2004
    Assignee: Nitto Kogyo Co., Ltd.
    Inventor: Naka Hirayama
  • Patent number: 6555163
    Abstract: A developing roller is provided with a roller core, an electrically conductive layer provided on a circumferential surface of the roller core, and a covering layer provided on the outer circumferential surface of the conductive layer. The covering layer has a thickness of 30 &mgr;m or less, but 0.1 &mgr;m or more, and has at least its surface region formed of a porous body.
    Type: Grant
    Filed: May 3, 2002
    Date of Patent: April 29, 2003
    Assignee: Nitto Kogyo Co., Ltd.
    Inventor: Naka Hirayama
  • Publication number: 20030013588
    Abstract: A developing roller has a roller core, an electrically conductive layer provided on a circumferential surface of the roller core, and a covering layer provided on the outer circumferential surface of the conductive layer. The covering layer is formed by subjecting a reaction mixture containing a fluorine-containing polyol, a reactive silicone oil having an active hydrogen, and an isocyanate compound, to a reaction condition for reacting the fluorine-containing polyol and the reactive silicone oil with the isocyanate compound.
    Type: Application
    Filed: August 16, 2002
    Publication date: January 16, 2003
    Applicant: Nitto Kogyo Co. Ltd.
    Inventor: Naka Hirayama
  • Publication number: 20030012585
    Abstract: A method of producing a developing roller, includes providing a roller core having an electrically conductive layer provided on a circumferential surface thereof, applying a reaction mixture containing a fluorine-containing polyol, an isocyanate compound, and a reactive silicone oil having an active hydrogen to a surface of the conductive layer, and subjecting the reaction mixture to a reaction condition for reacting the flourine-containing polyol and the reactive silicone oil with the isocyanate compound.
    Type: Application
    Filed: August 16, 2002
    Publication date: January 16, 2003
    Applicant: Nitto Kogyo Co. Ltd.
    Inventor: Naka Hirayama
  • Patent number: 6471628
    Abstract: A developing roller is provided with a roller core, an electrically conductive layer provided on a circumferential surface of the roller core, and a covering layer provided on the outer circumferential surface of the conductive layer. The covering layer has a thickness of 30 &mgr;m or less, but 0.1 &mgr;m or more, and has at least its surface region formed of a porous body.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: October 29, 2002
    Assignee: Nitto Kogyo Co. Ltd.
    Inventor: Naka Hirayama
  • Patent number: 6461674
    Abstract: A developing roller is provided with a roller core, an electrically conductive layer provided on a circumferential surface of the roller core, and a covering layer provided on the outer circumferential surface of the conductive layer. The covering layer has a thickness of 30 &mgr;m or less, but 0.1 &mgr;m or more, and has at least its surface region formed of a porous body.
    Type: Grant
    Filed: May 24, 2000
    Date of Patent: October 8, 2002
    Assignee: Nitto Kogyo Co., Ltd.
    Inventor: Naka Hirayama
  • Publication number: 20020128138
    Abstract: A developing roller is provided with a roller core, an electrically conductive layer provided on a circumferential surface of the roller core, and a covering layer provided on the outer circumferential surface of the conductive layer. The covering layer has a thickness of 30 &mgr;m or less, but 0.1 &mgr;m or more, and has at least its surface region formed of a porous body.
    Type: Application
    Filed: May 3, 2002
    Publication date: September 12, 2002
    Inventor: Naka Hirayama
  • Patent number: 6383564
    Abstract: A porous covering layer is formed on a substrate by applying a reaction mixture containing a polyol, an isocyanate compound, and a pore forming agent including a volatile silicone oil onto a surface of the substrate. The reaction mixture is subjected to a condition under which the polyol reacts with the isocyanate compound.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: May 7, 2002
    Assignee: Nitto Kogyo Co., Ltd.
    Inventor: Naka Hirayama
  • Patent number: 6270449
    Abstract: A developing roller has a core bar, an electrically conductive layer formed on the circumferential surface of the core bar, and a covering layer formed on the circumferential surface of the conductive layer. The covering layer includes a reaction product produced by subjecting a reaction mixture containing a polyol, an isocyanate compound and a both-terminal reactive silicone oil to a reaction condition for them, and has a dynamic friction coefficient against paper of 0.9 or more and less than 1.2.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: August 7, 2001
    Assignee: Nitto Kogyo Co., Ltd.
    Inventor: Naka Hirayama
  • Patent number: 6092032
    Abstract: An electroconductive roller which is to be installed in an image forming apparatus is provided with a core, a roller body which includes an elastic member having conductivity, and is provided on the outer circumference of said core, and an electroconductive coating layer covering an outer circumferential surface of said roller body. When glossiness of said coating layer is measured, a difference between common logarithms of a maximum value and a minimum value of measurement values is less than 0.1.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: July 18, 2000
    Assignee: Nitto Kogyo Co., Ltd.
    Inventor: Naka Hirayama