Patents by Inventor Takao Ohuchi

Takao Ohuchi 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: 7982940
    Abstract: The present invention provides particles for display media constituting the display media used for an information display panel, in which the display media are sealed between two substrates, at least one of two substrates being transparent, and, in which the display media, to which an electrostatic field is applied, are made to move so as to display information, comprising: the particles having a substantially spherical shape, which are made by polymerizing raw materials including monomers, which include (acrylic or methacrylic) resin-hydrocarbon resin copolymer in the particles, in which a part of or all of the monomers are a multifunctional monomer having a plurality of polymerization reactive groups in one molecule, and which have minute irregularities on their surface evenly. By such a construction, the particles for display media can obtain irregularities firmly fixed on their surface. Poor display can be solved by using the same.
    Type: Grant
    Filed: December 14, 2005
    Date of Patent: July 19, 2011
    Assignee: Bridgestone Corporation
    Inventors: Kazuya Murata, Takao Ohuchi, Hajime Kitano
  • Publication number: 20090290208
    Abstract: The present invention provides particles for display media constituting the display media used for an information display panel, in which the display media are sealed between two substrates, at least one of two substrates being transparent, and, in which the display media, to which an electrostatic field is applied, are made to move so as to display information, comprising: the particles having a substantially spherical shape, which are made by polymerizing raw materials including monomers, which include (acrylic or methacrylic) resin-hydrocarbon resin copolymer in the particles, in which a part of or all of the monomers are a multifunctional monomer having a plurality of polymerization reactive groups in one molecule, and which have minute irregularities on their surface evenly. By such a construction, the particles for display media can obtain irregularities firmly fixed on their surface. Poor display can be solved by using the same.
    Type: Application
    Filed: December 14, 2005
    Publication date: November 26, 2009
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Kazuya Murata, Takao Ohuchi, Hajime Kitano
  • Patent number: 7532387
    Abstract: In the particles for display media constituting the display media used for an information display panel, in which the display media having optical reflectance and charge characteristics are sealed between two substrates, at least one substrate being transparent, and, in which the display media, to which an electrostatic field is applied, are made to move so as to display information such as an image, the particles for display media having a substantially circular shape produced by a suspension polymerization of particle materials including monomer, wherein a part of the monomer is a cross-linking monomer and an amount of the cross-linking monomer is not less than 10 parts by weight and less than 50 parts by weight. By using the particles mentioned above, it is possible to obtain high heat resistance and low drive voltage (drive electric field).
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: May 12, 2009
    Assignee: Bridgestone Corporation
    Inventors: Takao Ohuchi, Kazuya Murata
  • Patent number: 7311969
    Abstract: In a semiconductive member having a coating film containing a conductive agent formed on the surface of a substrate such as an elastic material, or a semiconductive member having an elastic material as a substrate containing a conductive agent, the conductive agent is coated with an ion-containing resin or a resin having high charge attenuation properties.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: December 25, 2007
    Assignee: Kabushiki Kaisha Bridgestone
    Inventors: Yoshitomo Masuda, Gaku Yakushiji, Takao Ohuchi, Hajime Kitano
  • Publication number: 20070236776
    Abstract: In the particles for display media constituting the display media used for an information display panel, in which the display media having optical reflectance and charge characteristics are sealed between two substrates, at least one substrate being transparent, and, in which the display media, to which an electrostatic field is applied, are made to move so as to display information such as an image, the particles for display media having a substantially circular shape produced by a suspension polymerization of particle materials including monomer, wherein a part of the monomer is a cross-linking monomer and an amount of the cross-linking monomer is not less than 10 parts by weight and less than 50 parts by weight. By using the particles mentioned above, it is possible to obtain high heat resistance and low drive voltage (drive electric field).
    Type: Application
    Filed: April 4, 2007
    Publication date: October 11, 2007
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takao Ohuchi, Kazuya Murata
  • Patent number: 6638632
    Abstract: There is disclosed a rubber composition comprising (A) butadiene rubber and/or (B) isoprene rubber in the form of liquid and (C) silicone rubber at a {(A)+(B)}/(C) ratio by weight in the range of 97/3 to 5/95. The composition is capable of affording an elastic member which has a low hardness and excellent wear resistance, and which is well suited for use in a variety of part items that are installed in an image formation apparatus such as an electrophotographic apparatus and an electrostatic recording apparatus, including copying machinery, printers, facsimile apparatus and the like, in particular a developing roller. There are also disclosed a developing roller which comprises the above rubber composition, is improved in wear resistance for a developer without causing high hardness thereof, and is capable of affording a steadily favorable image without fail for a long period of time; and further a developing apparatus which comprises the above developing roller.
    Type: Grant
    Filed: July 31, 2001
    Date of Patent: October 28, 2003
    Assignee: Bridgestone Corporation
    Inventors: Takao Ohuchi, Kouji Takagi, Kazuya Murata, Toshiaki Arai
  • Patent number: 6580892
    Abstract: A shaft is disclosed, having good electroconductivity and an electroconductive elastic layer which is formed on the outside periphery of the shaft, and which has a thermal conductivity of at least 0.15 W /m·K; and an image formation apparatus equipped with the developing roller. The above developing roller is capable of suppressing temperature rise of the roller surface, thereby preventing a developer from being adhesively fixed to the roller surface, suppressing wear on the roller surface, suppressing the generation of cracking, crazing and the like on the roller end, and thus affording favorable images for a long period of time.
    Type: Grant
    Filed: December 19, 2001
    Date of Patent: June 17, 2003
    Assignee: Bridgestone Corporation
    Inventor: Takao Ohuchi
  • Patent number: 6512911
    Abstract: There are disclosed a toner carrier (I) having at least 0.70 of Z value, which is obtained from the formula (1) and deformation restoration behavior of the surface of the toner carrier at the time of measuring the universal hardness of the surface thereof: Z=We/(We+Wr)  (1) wherein We is elastic energy and Wr is plastic energy; a toner carrier (II) having at most 10.0 &mgr;m of 60 sec. creep value obtained from deformation restoration behavior of the surface of the toner carrier under measuring condition at a definite load of 100 mN /mm2; and a toner carrier (III) having at most 3 N /mm2 of universal hardness at a depth of at most 5 &mgr;m from the surface of the toner carrier under measuring condition at a definite load applying rate of 100/60(mN/mm2/sec.). Each of the toner carriers can afford steadily favorable images.
    Type: Grant
    Filed: July 30, 2001
    Date of Patent: January 28, 2003
    Assignee: Bridgestone Corporation
    Inventors: Toshiaki Arai, Koji Takagi, Kazuya Murata, Takao Ohuchi, Norio Nihei
  • Publication number: 20020142134
    Abstract: In a semiconductive member having a coating film containing a conductive agent formed on the surface of a substrate such as an elastic material, or a semiconductive member having an elastic material as a substrate containing a conductive agent, the conductive agent is coated with an ion-containing resin or a resin having high charge attenuation properties.
    Type: Application
    Filed: April 2, 2002
    Publication date: October 3, 2002
    Applicant: KABUSHIKI KAISHA BRIDGESTONE
    Inventors: Yoshitomo Masuda, Gaku Yakushiji, Takao Ohuchi, Hajime Kitano
  • Publication number: 20020114649
    Abstract: There are disclosed a developing roller comprisig a shaft having good electroconductivity and an electroconductive elastic layer which is formed on the outside periphery of the shaft, and which has a thermal conductivity of at least 0.15 W/m·K; and an image formation apparatus equipped with the developing roller. The above developing roller is capable of suppessing temperature rise of the roller surface, thereby preventing a developer from being adhesively fixed to the roller surface, suppessing wear on the roller surface, suppessing the generation of cracking, crazing and the like on the roller end, and thus affording favorable images for a long period of time.
    Type: Application
    Filed: December 19, 2001
    Publication date: August 22, 2002
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Takao Ohuchi
  • Patent number: 6420012
    Abstract: A toner carrier which carries a toner in the form of thin film on its surface, comes close to or comes into contact with the image-forming body so as to supply the toner to the surface of the image-forming body, thereby forming a visible image on the surface of the image-forming body, said toner carrier being characterized in that its conductive elastic layer has a coating layer thereon which is made of a material containing a resin with a glass transition point lower than 10° C. and has a dynamic elastic modulus (E′) of 107-109.8 dyn/cm2 and a loss tangent (tan &dgr;) smaller than 0.7. A toner carrier in which the electrically conductive elastic layer is formed from an elastic material having a tear strength greater than 10 kg/cm measured according to JIS K6252.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: July 16, 2002
    Assignee: Bridgestone Corporation
    Inventors: Koji Takagi, Toshiaki Arai, Takao Ohuchi, Tokuo Okada
  • Publication number: 20020034395
    Abstract: There is disclosed a rubber composition comprising (A) butadiene rubber and/or (B) isoprene rubber in the form of liquid and (C) silicone rubber at a {(A)+(B)}/(C) ratio by weight in the range of 97/3 to 5/95. The composition is capable of affording an elastic member which has a low hardness and excellent wear resistance, and which is well suited for use in a variety of part items that are installed in an image formation apparatus such as an electrophotographic apparatus and an electrostatic recording apparatus, including copying machinery, printers, facsimile apparatus and the like, in particular a developing roller. There are also disclosed a developing roller which comprises the above rubber composition, is improved in wear resistance for a developer without causing high hardness thereof, and is capable of affording a steadily favorable image without fail for a long period of time; and further a developing apparatus which comprises the above developing roller.
    Type: Application
    Filed: July 31, 2001
    Publication date: March 21, 2002
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Takao Ohuchi, Kouji Takagi, Kazuya Murata, Toshiaki Arai
  • Publication number: 20020031378
    Abstract: There are disclosed a toner carrier (1) having at least 0.
    Type: Application
    Filed: July 30, 2001
    Publication date: March 14, 2002
    Applicant: Bridgestone Corporation
    Inventors: Toshiaki Arai, Koji Takagi, Kazuya Murata, Takao Ohuchi, Norio Nihei