Patents by Inventor Yasuhisa Sugawara

Yasuhisa Sugawara 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: 10998137
    Abstract: An electrolytic capacitor according to an aspect of the present disclosure includes a valve metal, a dielectric oxide film layer formed on a surface of the valve metal, a surface treatment agent layer formed on the dielectric oxide film layer, and an electrolyte layer formed on the surface treatment agent layer. The electrolyte layer includes a conductive polymer layer and an ionic liquid. For example, the conductive polymer layer is formed so that the conductive polymer layer is in contact with the surface treatment agent layer, and at least some of voids present in an interface between the conductive polymer layer and the surface treatment agent layer are filled with the ionic liquid.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: May 4, 2021
    Assignee: TOKIN CORPORATION
    Inventors: Yasuhisa Sugawara, Masami Ishijima, Kenji Araki
  • Publication number: 20190333704
    Abstract: An electrolytic capacitor according to an aspect of the present disclosure includes a valve metal, a dielectric oxide film layer formed on a surface of the valve metal, a surface treatment agent layer formed on the dielectric oxide film layer, and an electrolyte layer formed on the surface treatment agent layer. The electrolyte layer includes a conductive polymer layer and an ionic liquid. For example, the conductive polymer layer is formed so that the conductive polymer layer is in contact with the surface treatment agent layer, and at least some of voids present in an interface between the conductive polymer layer and the surface treatment agent layer are filled with the ionic liquid.
    Type: Application
    Filed: August 3, 2018
    Publication date: October 31, 2019
    Inventors: Yasuhisa SUGAWARA, Masami ISHIJIMA, Kenji ARAKI
  • Patent number: 10418184
    Abstract: The solid electrolytic capacitor according to the present invention is a solid electrolytic capacitor including a valve metal, an oxide film layer formed on a surface of the valve metal, and a solid electrolyte layer formed on the oxide film layer, wherein the solid electrolyte layer contains a conductive polymer and a gel of an organic solvent solidified with a chemical gelling agent.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: September 17, 2019
    Assignee: Tokin Corporation
    Inventors: Yasuhisa Sugawara, Yuji Murayama, Hiroyuki Demizu, Hiroki Satoh
  • Patent number: 9761377
    Abstract: An electrically conductive polymer composition has high electrical conductivity, excellent water resistance, high density, and excellent smoothness. Also disclosed is a solid electrolyte capacitor which is prevented from the reduction in electrical conductivity, has low ESR, and also has excellent reliability. Further disclosed is a method for producing the solid electrolyte capacitor. The electrically conductive polymer composition is produced by removing a dispersion medium from an electrically conductive polymer suspension, wherein the electrically conductive polymer suspension includes: an electrically conductive polymer material including a dopant composed of a polyacid or a salt thereof and an electrically conductive polymer; at least one compound (A) selected from erythritol, xylitol and pentaerythritol; and the dispersion medium.
    Type: Grant
    Filed: November 20, 2014
    Date of Patent: September 12, 2017
    Assignee: TOKIN CORPORATION
    Inventors: Tomoki Nobuta, Ryuta Kobayakawa, Naoki Takahashi, Yasuhisa Sugawara, Satoshi Suzuki
  • Publication number: 20160293337
    Abstract: The solid electrolytic capacitor according to the present invention is a solid electrolytic capacitor including a valve metal, an oxide film layer formed on a surface of the valve metal, and a solid electrolyte layer formed on the oxide film layer, wherein the solid electrolyte layer contains a conductive polymer and a gel of an organic solvent solidified with a chemical gelling agent.
    Type: Application
    Filed: March 30, 2016
    Publication date: October 6, 2016
    Inventors: Yasuhisa Sugawara, Yuji Murayama, Hiroyuki Demizu, Hiroki Satoh
  • Patent number: 9455092
    Abstract: An electric conductive polymer suspension is produced by performing chemical oxidative polymerization of a monomer for providing an electric conductive polymer by using an oxidant in a solvent containing an organic acid or a salt thereof as a dopant to form an electric conductive polymer, recovering the electric conductive polymer, allowing an oxidant to act on the electric conductive polymer in an aqueous solvent containing a polyacid, and further mixing a dispersant with a branched structure and then pulverizing the electric conductive polymer. According to the electric conductive polymer suspension, an organic material high in conductivity, and excellent in adhesiveness to a substrate and water resistance, and a method for producing the material, as well as an electrolytic capacitor and a method for producing the capacitor can be provided.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: September 27, 2016
    Assignee: NEC Tokin Corporation
    Inventors: Yasuhisa Sugawara, Tomoki Nobuta, Satoshi Suzuki, Yasuhiro Tomioka
  • Patent number: 9452594
    Abstract: Provided is an electroconductive polymer composition with a good film forming property and a high electroconductivity. Also, provided is an electroconductive polymer material and an electroconductive substrate with a high electroconductivity and transparency. Further, provided is a solid electrolytic capacitor with a high capacity and a low ESR. Disclosed is an electroconductive polymer composition, containing an electroconductive polymer obtained by an oxidation polymerization by using an oxidant in a reaction solution which contains at least one monomer selected from the group consisting of pyrrole, thiophene and derivatives thereof, a polyacid or a salt thereof as a dopant, and a solvent containing water and an aprotic solvent.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: September 27, 2016
    Assignee: NEC Tokin Corporation
    Inventors: Tomoki Nobuta, Satoshi Suzuki, Yasuhisa Sugawara, Yasuhiro Tomioka
  • Publication number: 20160111221
    Abstract: A solid electrolytic capacitor including an alloy composed of titanium and zirconium as an anode conductor, an oxide film obtained by anodizing the anode conductor as a dielectric layer, and a conductive polymer as an electrolyte, wherein an atomic ratio of titanium and zirconium in the alloy of the anode conductor is from 80:20 to 10:90 as Ti:Zr, and wherein a film thickness of the oxide film is 5 nm or more and 1000 nm or less.
    Type: Application
    Filed: June 4, 2015
    Publication date: April 21, 2016
    Inventors: Yuji Murayama, Koji Sakata, Yasuhisa Sugawara, Hiroki Sato
  • Patent number: 9183990
    Abstract: Provided is an electroconductive polymer composition with a good film forming property. Also, provided is an electroconductive polymer material with a high electroconductivity and a high transparency as well as an electroconductive substrate having the electroconductive polymer material on a substrate, and an electrode. Further, provided is an electronic device having the electrode as well as a solid electrolytic capacitor with a high capacitance and a low ESR. Disclosed is an electroconductive polymer composition, containing an electroconductive polymer in which a dopant is doped, a water-soluble polymer resin, and a solvent which contains water and an organic solvent whose dielectric constant is higher than that of water.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: November 10, 2015
    Assignee: NEC Tokin Corporation
    Inventors: Tomoki Nobuta, Yasuhisa Sugawara, Satoshi Suzuki, Yasuhiro Tomioka
  • Publication number: 20150299887
    Abstract: There are provided a dielectric and an electrolytic capacitor that have a small amount of leakage current, and have high reliability also in a high temperature environment. A dielectric containing at least zirconium, titanium, and a carbon atom, wherein a concentration of the carbon atom is 100 ppm or more and 10,000 ppm or less, and an atomic ratio of the titanium to a sum of the zirconium and the titanium is 30% or more and 90% or less.
    Type: Application
    Filed: September 25, 2014
    Publication date: October 22, 2015
    Inventors: Yuji Murayama, Koji Sakata, Yasuhisa Sugawara
  • Patent number: 9087640
    Abstract: Provided are an electroconductive polymer suspension solution and a method for producing the same, which has excellent adhesion to a substrate and excellent liquid resistance and which can provide an organic material having high electroconductivity. An electroconductive polymer suspension solution of an exemplary embodiment of the invention contains an electroconductive polymer, at least one kind of a water-soluble polyhydric alcohol, and at least one kind of a water-soluble organic substance having two or more functional groups which can be polycondensed with the water-soluble polyhydric alcohol.
    Type: Grant
    Filed: April 8, 2011
    Date of Patent: July 21, 2015
    Assignee: NEC Tokin Corporation
    Inventors: Yasuhisa Sugawara, Tomoki Nobuta, Naoki Takahashi, Yuji Yoshida, Satoshi Suzuki, Yasuhiro Tomioka
  • Patent number: 9076590
    Abstract: The present invention provides an electroconductive polymer suspension solution and an electroconductive polymer material which has a high electroconductivity and in which the time-related deterioration of the electroconductivity is suppressed. Also, the present invention provides an electrolytic capacitor with a low ESR using the electroconductive polymer material as a solid electrolyte and a method for producing the same. In the present invention, electroconductive polymer particles 1 in the electroconductive polymer material are bonded via organic dispersant 2 and cross-linker 3 to obtain a strong bond between electroconductive polymer particles 1.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: July 7, 2015
    Assignee: NEC Tokin Corporation
    Inventors: Yasuhisa Sugawara, Tomoki Nobuta, Satoshi Suzuki, Yasuhiro Tomioka, Hiroyuki Demizu, Hiroki Satoh
  • Publication number: 20150077903
    Abstract: An electrically conductive polymer composition has high electrical conductivity, excellent water resistance, high density, and excellent smoothness. Also disclosed is a solid electrolyte capacitor which is prevented from the reduction in electrical conductivity, has low ESR, and also has excellent reliability. Further disclosed is a method for producing the solid electrolyte capacitor. The electrically conductive polymer composition is produced by removing a dispersion medium from an electrically conductive polymer suspension, wherein the electrically conductive polymer suspension includes: an electrically conductive polymer material including a dopant composed of a polyacid or a salt thereof and an electrically conductive polymer; at least one compound (A) selected from erythritol, xylitol and pentaerythritol; and the dispersion medium.
    Type: Application
    Filed: November 20, 2014
    Publication date: March 19, 2015
    Inventors: Tomoki NOBUTA, Ryuta KOBAYAKAWA, Naoki TAKAHASHI, Yasuhisa SUGAWARA, Satoshi SUZUKI
  • Patent number: 8940191
    Abstract: The present invention provides an electroconductive polymer solution in which the good dispersibility is maintained and the pH is arbitrarily adjusted, and an electroconductive polymer composition having an excellent heat resistance. Further, the present invention provides a solid electrolytic capacitor having an excellent reliability. The present invention is an electroconductive polymer solution, containing an electroconductive polymer in which a dopant is doped, a first compound having an amino group and a hydroxyl group, a second compound having a carboxylic acid group, and a dispersing medium.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: January 27, 2015
    Assignee: NEC Tokin Corporation
    Inventors: Tomoki Nobuta, Yasuhisa Sugawara, Satoshi Suzuki, Yasuhiro Tomioka
  • Patent number: 8804312
    Abstract: An exemplary embodiment of the invention provides an electroconductive polymer composition having high electroconductivity which is suitable for a solid electrolytic capacitor, and provides a solid electrolytic capacitor having low ESR as well as low leakage current (LC). In an exemplary embodiment of the invention, an electroconductive polymer composition having high electroconductivity is formed by drying an electroconductive polymer suspension solution which comprises a polyanion having a cross-linked structure, an electroconductive polymer, and a solvent. In an exemplary embodiment of the invention, a solid electrolytic capacitor having low ESR as well as low LC is obtained by using the electroconductive polymer composition for a solid electrolyte layer that is an electroconductive polymer layer.
    Type: Grant
    Filed: February 3, 2010
    Date of Patent: August 12, 2014
    Assignee: NEC Tokin Corporation
    Inventors: Yasuhisa Sugawara, Tomoki Nobuta, Naoki Takahashi, Ryuta Kobayakawa, Satoshi Suzuki
  • Publication number: 20140211372
    Abstract: An electric conductive polymer suspension is produced by performing chemical oxidative polymerization of a monomer for providing an electric conductive polymer by using an oxidant in a solvent containing an organic acid or a salt thereof as a dopant to form an electric conductive polymer, recovering the electric conductive polymer, allowing an oxidant to act on the electric conductive polymer in an aqueous solvent containing a polyacid, and further mixing a dispersant with a branched structure and then pulverizing the electric conductive polymer. According to the electric conductive polymer suspension, an organic material high in conductivity, and excellent in adhesiveness to a substrate and water resistance, and a method for producing the material, as well as an electrolytic capacitor and a method for producing the capacitor can be provided.
    Type: Application
    Filed: May 17, 2012
    Publication date: July 31, 2014
    Inventors: Yasuhisa Sugawara, Tomoki Nobuta, Satoshi Suzuki, Yasuhiro Tomioka
  • Publication number: 20140185192
    Abstract: Provided is a solid electrolytic capacitor having a low initial ESR in which the ESR increase with time can be suppressed. It is a solid electrolytic capacitor, including an electroconductive polymer layer, a graphite layer on the electroconductive polymer layer, and a silver layer on the graphite layer, wherein the electroconductive polymer layer and the graphite layer, and/or, the graphite layer and the silver layer are bonded by a chemical bond.
    Type: Application
    Filed: December 17, 2013
    Publication date: July 3, 2014
    Applicant: NEC TOKIN Corporation
    Inventors: Yasuhisa SUGAWARA, Koji Sakata, Yasuhiro Tomioka, Hiroyuki Demizu, Hiroki Satoh
  • Publication number: 20140168858
    Abstract: Provided is an electroconductive polymer solution containing an electroconductive polymer having high chemical resistance and a high electroconductivity. It is an electroconductive polymer solution, containing an electroconductive polymer having thiophene, aniline, pyrrole, or a derivative thereof as a repeating unit, wherein a dopant or a salt thereof having an amide bond and an anion group is doped into the electroconductive polymer.
    Type: Application
    Filed: December 16, 2013
    Publication date: June 19, 2014
    Applicant: NEC TOKIN Corporation
    Inventors: Hiroki SATOH, Yasuhisa Sugawara, Hiroyuki Demizu, Yasuhiro Tomioka, Koji Sakata
  • Publication number: 20140098467
    Abstract: An electroconductive polymer having high electroconductivity, an electroconductive polymer aqueous solution, and an electroconductive polymer film are provided. Further, a solid electrolytic capacitor having a reduced ESR and a method for producing the same are provided. An electroconductive polymer according to an exemplary embodiment of the invention contains a monomolecular organic acid having one anion group and one or more hydrophilic group.
    Type: Application
    Filed: May 30, 2012
    Publication date: April 10, 2014
    Inventors: Yasuhisa Sugawara, Tomoki Nobuta, Yuji Yoshida, Satoshi Suzuki, Yasuhiro Tomioka
  • Publication number: 20140092529
    Abstract: Provided are an electroconductive polymer solution in which the carbon material has excellent dispersibility, an electroconductive polymer material which has a high electroconductivity and which can be produced by a simple method, and a solid electrolytic capacitor and a method for producing the same which has a low ESR without increasing a leakage current. An electroconductive polymer solution according to an exemplary embodiment of the invention contains an electroconductive polymer, a polysulfonic acid or a salt thereof which functions as a dopant to the electroconductive polymer, a mixture of a polyacid and a carbon material, and a solvent.
    Type: Application
    Filed: February 27, 2012
    Publication date: April 3, 2014
    Applicant: NEC TOKIN CORPORATION
    Inventors: Tomoki Nobuta, Yasuhisa Sugawara, Yuji Yoshida, Satoshi Suzuki, Yasuhiro Tomioka