Patents by Inventor Ryuta Kobayakawa

Ryuta Kobayakawa 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: 11718144
    Abstract: A vehicle thermal management system includes a vehicle driving battery that generates heat during charging and discharging and a liquid heat transfer medium that transfers heat received from the battery. The system further includes a heat receiver that causes the heat transfer medium to receive heat through heat exchange with the battery and that includes a portion in contact with the heat transfer medium and made of a material containing aluminum. The system further includes a refrigerant heat exchanger that causes the heat transfer medium to release heat through heat exchange with a refrigerant and that includes a portion in contact with the heat transfer medium and made of a material containing aluminum. The heat transfer medium includes a liquid base material including water, an orthosilicic acid ester compatible with the liquid base material, and an azole derivative and has an electric insulation property.
    Type: Grant
    Filed: December 9, 2021
    Date of Patent: August 8, 2023
    Assignee: DENSO CORPORATION
    Inventors: Takuya Fuse, Kouji Inagaki, Ryuta Kobayakawa, Shinya Kasamatsu, Saori Nakajima
  • Publication number: 20220097479
    Abstract: A vehicle thermal management system includes a vehicle driving battery that generates heat during charging and discharging and a liquid heat transfer medium that transfers the heat received from the battery. The system further includes a heat receiver that causes the heat transfer medium to receive the heat and a refrigerant heat exchanger that causes the heat transfer medium to release the heat. The heat transfer medium includes a liquid base material including water and an orthosilicic acid ester compatible with the liquid base material and does not include an ionic rust inhibitor. The orthosilicic acid ester is present, as a concentration of silicon, relative to a total mass of the heat transfer medium within a range between 1 mass ppm, inclusive, and 2000 mass ppm, inclusive or within a range between 2000 mass ppm, non-inclusive, and 10000 mass ppm, inclusive.
    Type: Application
    Filed: December 9, 2021
    Publication date: March 31, 2022
    Inventors: Takuya FUSE, Kouji INAGAKI, Ryuta KOBAYAKAWA, Shinya KASAMATSU, Saori NAKAJIMA
  • Publication number: 20210355362
    Abstract: A heat transfer medium for transferring heat from a vehicle driving battery that generates heat during charging and discharging includes a liquid base material, an orthosilicic acid ester compatible with the base material, and an ion adsorbent dispersed in the base material. The ion adsorbent is formed of a plurality of solid particles and adsorbs at least one of anions and cations present in the heat transfer medium.
    Type: Application
    Filed: July 28, 2021
    Publication date: November 18, 2021
    Inventors: Takuya FUSE, Shinya KASAMATSU, Kouji INAGAKI, Ryuta KOBAYAKAWA, Saori NAKAJIMA
  • Publication number: 20210328286
    Abstract: A vehicle thermal management system mounted in a vehicle includes a vehicle driving battery, a liquid heat transfer medium, a heat receiver, and a radiator. The heat receiver causes the heat transfer medium to receive heat through heat exchange with the battery. The radiator causes the heat transfer medium to release the heat through heat exchange with an air outside of the vehicle. The heat transfer medium includes a liquid base material including water and an orthosilicic acid ester compatible with the liquid base material and does not include an ionic rust inhibitor. The orthosilicic acid ester is present, as a concentration of silicon, relative to a total mass of the heat transfer medium within a range between 2000 mass ppm, non-inclusive, and 10000 mass ppm, inclusive.
    Type: Application
    Filed: June 23, 2021
    Publication date: October 21, 2021
    Inventors: Takuya FUSE, Kouji INAGAKI, Ryuta KOBAYAKAWA, Shinya KASAMATSU, Saori NAKAJIMA
  • Publication number: 20210316590
    Abstract: A vehicle thermal management system includes a vehicle driving battery that generates heat during charging and discharging and a liquid heat transfer medium that transfers the heat received from the battery. The system further includes a heat receiver that causes the heat transfer medium to receive the heat and a refrigerant heat exchanger that causes the heat transfer medium to release the heat. The heat transfer medium includes a liquid base material including water and an orthosilicic acid ester compatible with the liquid base material and does not include an ionic rust inhibitor. The orthosilicic acid ester is present, as a concentration of silicon, relative to a total mass of the heat transfer medium within a range between 1 mass ppm, inclusive, and 2000 mass ppm, inclusive or within a range between 2000 mass ppm, non-inclusive, and 10000 mass ppm, inclusive.
    Type: Application
    Filed: June 23, 2021
    Publication date: October 14, 2021
    Inventors: Takuya FUSE, Kouji INAGAKI, Ryuta KOBAYAKAWA, Shinya KASAMATSU, Saori NAKAJIMA
  • 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: 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: 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
  • Patent number: 8625254
    Abstract: A solid electrolytic capacitor includes an anode formed of a valve metal and having a roughened surface layer at a surface thereof, a dielectric layer formed of a valve metal oxide and formed on the anode, a cathode formed of a conductive polymer layer formed on the dielectric layer, an anode lead formed adjacent to and integrally with the anode, and a resist formed of an insulating material and delimiting the anode and the anode lead. The anode and the anode lead have a first stepped portion having both surfaces each cut in a thickness direction and covered with the resist, and the anode lead has a second stepped portion having both surfaces each cut deeper in the thickness direction than the first stepped portion.
    Type: Grant
    Filed: September 19, 2011
    Date of Patent: January 7, 2014
    Assignee: NEC Tokin Corporation
    Inventors: Naoki Takahashi, Toshihiko Nishiyama, Satoshi Suzuki, Ryuta Kobayakawa, Tomoki Nobuta
  • Publication number: 20130252096
    Abstract: A nonaqueous electrolyte rechargeable battery includes a positive electrode, a negative electrode, and an electrolyte solution. The positive electrode includes a positive-electrode active material that occludes and discharges an alkali metal ion. The negative electrode includes a negative-electrode active material that occludes and discharges an alkali metal ion. At least one of the positive electrode and the negative electrode contains a conductive polymer. The conductive polymer has a fiber-form or a three-dimensional structure provided by the fiber-form as a base, the fiber-form having a fiber diameter of equal to or less than 100 nm and an aspect ratio of equal to or greater than 10.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 26, 2013
    Applicants: JAPAN CARLIT CO., LTD., DENSO CORPORATION
    Inventors: Ryuta Kobayakawa, Kyohei Usami, Shigeki Komine, Masaaki Tamura, Tomohiko Abe, Makoto Kodaira
  • Publication number: 20130252102
    Abstract: A nonaqueous electrolyte rechargeable battery includes a positive electrode, a negative electrode, and an electrolyte solution. The positive electrode includes a positive-electrode active material that occludes and discharges an alkali metal ion. The negative electrode includes a negative-electrode active material that occludes and discharges an alkali metal ion. At least one of the positive electrode and the negative electrode contains a conductive polymer that binds the active material and provides oxidation resistance.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 26, 2013
    Applicants: JAPAN CARLIT CO., LTD., DENSO CORPORATION
    Inventors: Ryuta Kobayakawa, Kyohei Usami, Shigeki Komine, Yuuki Tachibana, Masaaki Tamura, Tomohiko Abe, Makoto Kodaira
  • Patent number: 8388865
    Abstract: A conductive polymer composition with excellent water resistance and conductivity, and a solid electrolytic capacitor with low ESR, excellent reliability, and especially moisture resistance. The conductive polymer composition includes a conductive polymer, a polyanion that includes a hydrophilic group, where the polyanion functioning as a dopant of the conductive polymer. At least a part of the hydrophilic group of the polyanion is condensed with an epoxy group in a compound with one epoxy group. A solid electrolytic capacitor of the present invention includes the conductive polymer composition.
    Type: Grant
    Filed: September 21, 2009
    Date of Patent: March 5, 2013
    Assignee: NEC Tokin Corporation
    Inventors: Yasuhisa Sugawara, Tomoki Nobuta, Naoki Takahashi, Ryuta Kobayakawa, Satoshi Suzuki
  • Patent number: 8289677
    Abstract: The present invention provides a conductive polymer suspension for providing a conductive polymer material having a high conductivity and a method for producing the same, and in particular, a solid electrolytic capacitor having a low ESR and a method for producing the same. The conductive polymer suspension is produced by: synthesizing a conductive polymer by chemical oxidative polymerization of a monomer giving the conductive polymer by using an oxidant in a solvent containing a dopant consisting of a low-molecular organic acid or a salt thereof; purifying the conductive polymer; and mixing the purified conductive polymer and an oxidant in an aqueous solvent containing a polyacid component.
    Type: Grant
    Filed: July 28, 2009
    Date of Patent: October 16, 2012
    Assignee: NEC Tokin Corporation
    Inventors: Ryuta Kobayakawa, Tomoki Nobuta, Naoki Takahashi, Yasuhisa Sugawara, Satoshi Suzuki, Toshihiko Nishiyama
  • Patent number: 8279582
    Abstract: The present invention provides a conductive polymer suspension for providing a conductive polymer material having a high conductivity and a method for producing the same, and in particular, a solid electrolytic capacitor having a low ESR and a method for producing the same. The conductive polymer suspension can be is produced by: synthesizing a conductive polymer by chemical oxidative polymerization of a monomer giving the conductive polymer by using an oxidant in an aqueous solvent containing a dopant consisting of a low-molecular organic acid or a salt thereof, or a polyacid having a weight average molecular weight of less than 2,000 or a salt thereof.
    Type: Grant
    Filed: July 28, 2009
    Date of Patent: October 2, 2012
    Assignee: NEC Tokin Corporation
    Inventors: Tomoki Nobuta, Ryuta Kobayakawa, Naoki Takahashi, Yasuhisa Sugawara, Satoshi Suzuki, Toshihiko Nishiyama
  • Publication number: 20120120557
    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: Application
    Filed: February 3, 2010
    Publication date: May 17, 2012
    Inventors: Yasuhisa Sugawara, Tomoki Nobuta, Naoki Takahashi, Ryuta Kobayakawa, Satoshi Suzuki
  • Patent number: 8164884
    Abstract: In a solid electrolytic capacitor including a porous valve-acting metal, an anode conductor has a large number of pores having openings on the surface thereof according to the porosity of the valve-acting metal. A solid electrolyte layer is formed on the surface of the anode conductor so as to be filled in at least a portion of each of the pores and to close the openings thereof. Further, a cathode conductor is formed on the solid electrolyte layer. Preferably, the solid electrolyte layer has a two-layer structure with two layers having different particle sizes.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: April 24, 2012
    Assignee: NEC TOKIN Corporation
    Inventors: Tomoki Nobuta, Naoki Takahashi, Ryuta Kobayakawa, Satoshi Suzuki, Toshihiko Nishiyama
  • Publication number: 20120002350
    Abstract: A solid electrolytic capacitor includes an anode formed of a valve metal and having a roughened surface layer at a surface thereof, a dielectric layer formed of a valve metal oxide and formed on the anode, a cathode formed of a conductive polymer layer formed on the dielectric layer, an anode lead formed adjacent to and integrally with the anode, and a resist formed of an insulating material and delimiting the anode and the anode lead. The anode and the anode lead have a first stepped portion having both surfaces each cut in a thickness direction and covered with the resist, and the anode lead has a second stepped portion having both surfaces each cut deeper in the thickness direction than the first stepped portion.
    Type: Application
    Filed: September 19, 2011
    Publication date: January 5, 2012
    Applicant: NEC TOKlN CORPORATION
    Inventors: Naoki TAKAHASHI, Toshihiko Nishiyama, Satoshi Suzuki, Ryuta Kobayakawa, Tomoki Nobuta
  • Patent number: 8038738
    Abstract: A solid electrolytic capacitor manufacturing method includes a process of removing a roughened surface layer (10a?) from a distal portion (13) of a metal member (10) and from part of an intermediate portion (12) adjacent to the distal portion (13), a process of forming a resist (40) on the distal portion (13) and the intermediate portion (12) of the metal member (10), a process of forming a conductive polymer layer (30) of a conductive polymer on a proximal portion (11) of the metal member (10), and a process of removing a resist (40?) and a surface layer portion (13?) of the metal member (10) from the distal portion (13) of the metal member (10).
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: October 18, 2011
    Assignee: NEC Tokin Corporation
    Inventors: Naoki Takahashi, Toshihiko Nishiyama, Satoshi Suzuki, Ryuta Kobayakawa, Tomoki Nobuta
  • Publication number: 20110019340
    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: April 10, 2009
    Publication date: January 27, 2011
    Applicant: NEC TOKIN CORPORATION
    Inventors: Tomoki Nobuta, Ryuta Kobayakawa, Naoki Takahashi, Yasuhisa Sugawara, Satoshi Suzuki
  • Publication number: 20100302714
    Abstract: An exemplary aspect of the invention provides a conductive polymer suspension for providing a conductive polymer material with high conductivity and a method for producing the same, and provides a solid electrolytic capacitor with low ESR and a method for producing the same. In an exemplary embodiment, a monomer providing a conductive polymer is subjected to chemical oxidative polymerization in a solvent comprising a dopant of an organic acid or a salt thereof, using an oxidant, to synthesize the conductive polymer; the conductive polymer is purified; the purified conductive polymer and an oxidant are mixed in an aqueous solvent comprising a polyacid; and an imidazole compound is further added to produce a conductive polymer suspension.
    Type: Application
    Filed: May 17, 2010
    Publication date: December 2, 2010
    Applicant: NEC Tokin Corporation
    Inventors: Ryuta Kobayakawa, Tomoki Nobuta, Naoki Takahashi, Yasuhisa Sugawara, Satoshi Suzuki