Patents by Inventor Mitsugu Uejima

Mitsugu Uejima 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: 20210297013
    Abstract: A dielectric elastomer power generation system A1 includes a dielectric elastomer power generation element 3 having a dielectric elastomer layer 31 and a pair of electrode layers 32 sandwiching the dielectric elastomer layer 31. The dielectric elastomer power generation system A1 further includes a piezoelectric element 1 and a multi-stage voltage multiplier/rectifier circuit 2 that boosts and rectifies the voltage generated by the piezoelectric element 1 and applies the resulting voltage as an initial voltage to the dielectric elastomer power generation element 3. This configuration enables the system to be constructed at a lower cost and increase the amount of power generation.
    Type: Application
    Filed: July 10, 2019
    Publication date: September 23, 2021
    Applicants: ZEON CORPORATION
    Inventors: Seiki CHIBA, Mikio WAKI, Makoto TAKESHITA, Mitsugu UEJIMA
  • Publication number: 20200277192
    Abstract: Provided is a material that has excellent handleability and processability, and that when used as a support for a different material, enables support of the different material up to an inner part thereof. A carbon sheet contains one or more carbon nanotubes and has a porosity of not less than 5% and not more than 90%. The carbon sheet preferably includes: a porous substrate made from carbon; and the carbon nanotubes, attached to the porous substrate. The carbon nanotubes contained in the carbon sheet are preferably single-walled carbon nanotubes. Moreover, the carbon nanotubes contained in the carbon sheet preferably have a nitrogen adsorption specific surface area of 600 m2/g or more.
    Type: Application
    Filed: September 27, 2018
    Publication date: September 3, 2020
    Applicant: ZEON CORPORATION
    Inventors: Tomoko YAMAGISHI, Mitsugu UEJIMA
  • Patent number: 10611640
    Abstract: Provided are a carbon film having excellent electrical conductivity and a method of producing this carbon film. The carbon film has a film surface glossiness at 60° of at least 2 and not more than 500. The method of producing the carbon film includes forming a carbon film by removing a solvent from a fibrous carbon nanostructure dispersion liquid containing the solvent and one or more fibrous carbon nanostructures.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: April 7, 2020
    Assignee: ZEON CORPORATION
    Inventors: Tsutomu Nagamune, Mitsugu Uejima, Tomoko Yamagishi
  • Publication number: 20200102697
    Abstract: Disclosed is a sheet which comprises a fibrous substrate and carbon nanotubes attached to fibers constituting the fibrous substrate. The carbon nanotubes in the sheet comprise single-walled carbon nanotubes as a main component.
    Type: Application
    Filed: September 21, 2018
    Publication date: April 2, 2020
    Applicants: ZEON CORPORATION, Hirose Paper Mfg Co., Ltd., Toyota Tsusho Matex Corporation
    Inventors: Tomoko YAMAGISHI, Mitsugu UEJIMA, Tomoya NISHIUCHI, Naruaki TAKAHASHI
  • Patent number: 10392254
    Abstract: Provided is a carbon film including: a plurality of fibrous carbon nanostructures; and a conductive carbon, wherein the plurality of fibrous carbon nanostructures has a BET specific surface area of 500 m2/g or more. Also provided is a method of producing a carbon film, the method including mixing a conductive carbon into a fibrous carbon nanostructure dispersion liquid containing a plurality of fibrous carbon nanostructures having a BET specific surface area of 500 m2/g or more, a dispersant, and a solvent, and subsequently removing the solvent to form a carbon film.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: August 27, 2019
    Assignee: ZEON CORPORATION
    Inventors: Tomoko Yamagishi, Mitsugu Uejima
  • Patent number: 10283231
    Abstract: An electrically conductive composition of the present invention contains an expanded graphite, carbon nanotubes, and a polymer compound. An amount of the expanded graphite to be contained is not less than 30 parts by weight and not more than 70 parts by weight with respect to 100 parts by weight of a total amount of the expanded graphite and the polymer compound. An amount of the carbon nanotubes to be contained is not less than 0.5 part by weight and not more than 10 parts by weight with respect to 100 parts by weight of the total amount of the expanded graphite and the polymer compound.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: May 7, 2019
    Assignee: ZEON CORPORATION
    Inventors: Tsutomu Nagamune, Masahiro Shigeta, The Ban Hoang, Mitsugu Uejima
  • Publication number: 20190074102
    Abstract: Provided is a latex composition consists of a latex including a polymer having a tetrahydrofuran-insoluble component content of at least 5 mass % and no greater than 75 mass %; carbon nanotubes having an average diameter Av and a diameter distribution 3? satisfying a relationship 0.60>3?/Av>0.20; and an additive selected from the group consisting of a dispersant, a cross-linking agent, a plasticizer, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a pigment, a colorant, a foaming agent, a flame retardant, a lubricant, a softener, a tackifier, a mold release agent, a deodorant, and a perfume. The carbon nanotubes have a specific surface area of at least 600 m2/g, and in a Raman spectrum of the carbon nanotubes, a ratio of G band peak intensity relative to D band peak intensity (G/D ratio) is at least 1 and no greater than 20.
    Type: Application
    Filed: October 29, 2018
    Publication date: March 7, 2019
    Applicant: ZEON CORPORATION
    Inventors: Masahiro Shigeta, Mitsugu Uejima, The Ban Hoang
  • Patent number: 10207929
    Abstract: A carbon nanotube film includes an assembly of a plurality of carbon nanotubes, wherein the plurality of carbon nanotubes includes one or more carbon nanotubes having at least partially collapsed structures. A method for producing a carbon nanotube film includes forming a carbon nanotube film by removing a solvent from a carbon nanotube dispersion liquid containing the solvent, a dispersant, and a plurality of carbon nanotubes including one or more carbon nanotubes having at least partially collapsed structures.
    Type: Grant
    Filed: December 24, 2015
    Date of Patent: February 19, 2019
    Assignee: ZEON CORPORATION
    Inventors: Tomoko Yamagishi, Mitsugu Uejima
  • Patent number: 10189713
    Abstract: Provided is a method for efficiently producing a carbon nanotube dispersion liquid in which less-damaged carbon nanotubes are highly dispersed. The method for producing a carbon nanotube dispersion liquid includes: (A) obtaining a carbon nanotube dispersion liquid by applying a shear force to a coarse dispersion liquid that includes carbon nanotubes having a specific surface area of 600 m2/g or more to whereby disperse the carbon nanotubes, wherein the step (A) includes at least one of applying a back pressure to the carbon nanotube dispersion liquid and cooling the carbon nanotube dispersion liquid.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: January 29, 2019
    Assignee: ZEON CORPORATION
    Inventors: Mitsugu Uejima, Masahiro Shigeta
  • Patent number: 10163541
    Abstract: Provided is a latex composition including a latex that includes a polymer having a tetrahydrofuran-insoluble component content of at least 1 mass % and no greater than 75 mass % and carbon nanotubes that have an average diameter (Av) and a diameter distribution (3?) satisfying a relationship 0.60>3?/Av>0.20. A composite material and a conductive formed product obtainable using the latex composition exhibit superior conductivity.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: December 25, 2018
    Assignee: ZEON CORPORATION
    Inventors: Masahiro Shigeta, Mitsugu Uejima, The Ban Hoang
  • Patent number: 10138347
    Abstract: Provided is a method for efficiently producing a carbon nanotube (CNT) dispersion liquid of highly dispersed CNTs while also suppressing damage to the CNTs. The method for producing a carbon nanotube dispersion liquid includes a dispersing step that includes at least one cycle of dispersing treatment in which pressure is applied to a coarse dispersion liquid containing carbon nanotubes and a dispersion medium, the coarse dispersion liquid is fed under pressure, and shear force is applied to the coarse dispersion liquid such as to disperse the carbon nanotubes. A plurality of repetitions of the dispersing step are performed while altering the pressure that is applied to the coarse dispersion liquid. In at least one instance, the pressure applied to the coarse dispersion liquid is altered by at least 10 MPa between consecutive repetitions of the dispersing step.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: November 27, 2018
    Assignee: ZEON CORPORATION
    Inventors: Masahiro Shigeta, Mitsugu Uejima
  • Publication number: 20180127273
    Abstract: Provided are a carbon film having excellent electrical conductivity and a method of producing this carbon film. The carbon film has a film surface glossiness at 60° of at least 2 and not more than 500. The method of producing the carbon film includes forming a carbon film by removing a solvent from a fibrous carbon nanostructure dispersion liquid containing the solvent and one or more fibrous carbon nanostructures.
    Type: Application
    Filed: May 26, 2016
    Publication date: May 10, 2018
    Applicant: ZEON CORPORATION
    Inventors: Tsutomu NAGAMUNE, Mitsugu UEJIMA, Tomoko YAMAGISHI
  • Publication number: 20180065854
    Abstract: Provided is a carbon film including: a plurality of fibrous carbon nanostructures; and a conductive carbon, wherein the plurality of fibrous carbon nanostructures has a BET specific surface area of 500 m2/g or more. Also provided is a method of producing a carbon film, the method including mixing a conductive carbon into a fibrous carbon nanostructure dispersion liquid containing a plurality of fibrous carbon nanostructures having a BET specific surface area of 500 m2/g or more, a dispersant, and a solvent, and subsequently removing the solvent to form a carbon film.
    Type: Application
    Filed: March 22, 2016
    Publication date: March 8, 2018
    Applicant: ZEON CORPORATION
    Inventors: Tomoko YAMAGISHI, Mitsugu UEJIMA
  • Publication number: 20170369319
    Abstract: A carbon nanotube film includes an assembly of a plurality of carbon nanotubes, wherein the plurality of carbon nanotubes includes one or more carbon nanotubes having at least partially collapsed structures. A method for producing a carbon nanotube film includes forming a carbon nanotube film by removing a solvent from a carbon nanotube dispersion liquid containing the solvent, a dispersant, and a plurality of carbon nanotubes including one or more carbon nanotubes having at least partially collapsed structures.
    Type: Application
    Filed: December 24, 2015
    Publication date: December 28, 2017
    Applicant: ZEON CORPORATION
    Inventors: Tomoko YAMAGISHI, Mitsugu UEJIMA
  • Patent number: 9802823
    Abstract: A carbon nanotube fiber is provided that that has excellent properties such as electrical conductivity, thermal conductivity, and mechanical characteristics. The carbon nanotube fiber includes an assembly of a plurality of carbon nanotubes. The plurality of carbon nanotubes includes one or more carbon nanotubes having at least partially collapsed structures. Furthermore, a method for producing a carbon nanotube fiber is provided that includes spinning a carbon nanotube dispersion liquid containing a plurality of carbon nanotubes including one or more carbon nanotubes having at least partially collapsed structures, a dispersant, and a solvent by extruding the carbon nanotube dispersion liquid into a coagulant liquid.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: October 31, 2017
    Assignee: ZEON CORPORATION
    Inventor: Mitsugu Uejima
  • Patent number: 9776873
    Abstract: Provided are carbon nanotubes that allow effective utilization of the insides thereof as-synthesized, without undergoing opening formation treatment. The provided carbon nanotubes have not undergone opening formation treatment and exhibit a convex upward shape in a t-plot obtained from an adsorption isotherm.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: October 3, 2017
    Assignee: ZEON CORPORATION
    Inventors: Hirokazu Takai, Mitsugu Uejima
  • Patent number: 9748016
    Abstract: A method of the present invention for producing a carbon nanotube includes: a dispersing step of dispersing a carbon nanotube in a solvent by carrying out a dispersion treatment that brings about a cavitation effect, the carbon nanotube having an average diameter (Av) and a diameter distribution (3?) that satisfy 0.60>3?/Av>0.20; and a mixing step of mixing carbon nanotube slurry obtained in the dispersing step with latex.
    Type: Grant
    Filed: October 26, 2012
    Date of Patent: August 29, 2017
    Inventors: Masahiro Shigeta, Tsutomu Nagamune, The Ban Hoang, Mitsugu Uejima
  • Publication number: 20170121178
    Abstract: Provided is a method for efficiently producing a carbon nanotube (CNT) dispersion liquid of highly dispersed CNTs while also suppressing damage to the CNTs. The method for producing a carbon nanotube dispersion liquid includes a dispersing step that includes at least one cycle of dispersing treatment in which pressure is applied to a coarse dispersion liquid containing carbon nanotubes and a dispersion medium, the coarse dispersion liquid is fed under pressure, and shear force is applied to the coarse dispersion liquid such as to disperse the carbon nanotubes. A plurality of repetitions of the dispersing step are performed while altering the pressure that is applied to the coarse dispersion liquid. In at least one instance, the pressure applied to the coarse dispersion liquid is altered by at least 10 MPa between consecutive repetitions of the dispersing step.
    Type: Application
    Filed: May 18, 2015
    Publication date: May 4, 2017
    Applicant: ZEON CORPORATION
    Inventors: Masahiro SHIGETA, Mitsugu UEJIMA
  • Patent number: 9593227
    Abstract: A rubber composition having extremely high electrical conductivity is provided. The rubber composition contains nitrile rubber (A) having an ?,?-ethylenic unsaturated nitrile monomer unit and an iodine value of 100 or lower, and carbon nanotubes (B) having the average diameter (Av) and diameter distribution (3?) that satisfy the following relational expression: 0.60>3?/Av>0.20.
    Type: Grant
    Filed: December 18, 2013
    Date of Patent: March 14, 2017
    Assignee: ZEON CORPORATION
    Inventors: Masahiro Shigeta, The Ban Hoang, Mitsugu Uejima
  • Publication number: 20160340193
    Abstract: A carbon nanotube fiber is provided that that has excellent properties such as electrical conductivity, thermal conductivity, and mechanical characteristics. The carbon nanotube fiber includes an assembly of a plurality of carbon nanotubes. The plurality of carbon nanotubes includes one or more carbon nanotubes having at least partially collapsed structures. Furthermore, a method for producing a carbon nanotube fiber is provided that includes spinning a carbon nanotube dispersion liquid containing a plurality of carbon nanotubes including one or more carbon nanotubes having at least partially collapsed structures, a dispersant, and a solvent by extruding the carbon nanotube dispersion liquid into a coagulant liquid.
    Type: Application
    Filed: January 29, 2015
    Publication date: November 24, 2016
    Applicant: ZEON CORPORATION
    Inventor: Mitsugu UEJIMA