Patents by Inventor Kaoru Kitakizaki

Kaoru Kitakizaki 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: 10262819
    Abstract: Disclosed is a vacuum circuit breaker (1) including a vacuum interrupter (3) accommodated in a ground tank (2) filled with insulating gas. At least one of a fixed electrode (10) and a movable electrode (11) of the vacuum interrupter (3) uses an electrode material in which particles containing a solid solution of a heat resistant element and Cr are finely and uniformly dispersed and in which Cu textures as a high conductive component are finely and uniformly dispersed. The electrode material contains 20 to 70% by weight of Cu, 1.5 to 64% by weight of Cr and 6 to 76% by weight of the heat resistant element relative to a weight of the electrode material. The particles of the solid solution in the electrode material have an average particle size of 20 ?m or smaller.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: April 16, 2019
    Assignee: MEIDENSHA CORPORATION
    Inventors: Kazuhiro Nagatake, Kaoru Kitakizaki, Keita Ishikawa, Shota Hayashi, Kosuke Hasegawa
  • Patent number: 10086433
    Abstract: A process for producing an electrode material by infiltrating a highly conductive metal such as Cu into a porous object containing heat-resistant elements. Before an infiltration step in which the highly conductive metal is infiltrated, a HIP treatment is given to a powder containing the heat-resistant elements (or to a molded object obtained by molding a powder containing the heat-resistant elements). The composition is controlled so that the HIP treatment yields a porous object which has a degree of filling of 70% or higher, more preferably 75% or higher. The highly conductive metal is infiltrated into the porous object having the controlled composition.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: October 2, 2018
    Assignee: MEIDENSHA CORPORATION
    Inventors: Kaoru Kitakizaki, Keita Ishikawa, Shota Hayashi, Nobutaka Suzuki
  • Publication number: 20180247780
    Abstract: Disclosed is a vacuum circuit breaker (1) including a vacuum interrupter (3) accommodated in a ground tank (2) filled with insulating gas. At least one of a fixed electrode (10) and a movable electrode (11) of the vacuum interrupter (3) uses an electrode material in which particles containing a solid solution of a heat resistant element and Cr are finely and uniformly dispersed and in which Cu textures as a high conductive component are finely and uniformly dispersed. The electrode material contains 20 to 70% by weight of Cu, 1.5 to 64% by weight of Cr and 6 to 76% by weight of the heat resistant element relative to a weight of the electrode material. The particles of the solid solution in the electrode material have an average particle size of 20 ?m or smaller.
    Type: Application
    Filed: August 23, 2016
    Publication date: August 30, 2018
    Applicant: MEIDENSHA CORPORATION
    Inventors: Kazuhiro NAGATAKE, Kaoru KITAKIZAKI, Keita ISHIKAWA, Shota HAYASHI, Kosuke HASEGAWA
  • Patent number: 10058923
    Abstract: What is disclosed is an electrode material including a sintered body containing a heat resistant element and Cr and being infiltrated with a highly conductive material. A powder mixture of a heat resistant element powder and a Cr powder is subjected to a provisional sintering in advance, thereby causing solid phase diffusion of the heat resistant element and Cr. After a Mo—Cr solid solution obtained by the provisional sintering is pulverized, the pulverized Mo—Cr solid solution powder is molded and sintered. A sintered body obtained by sintering is subjected to a HIP treatment. The highly conductive metal is disposed on the sintered body after the HIP treatment, and infiltrated into the sintered body by heating at a predetermined temperature. By conducting the HIP treatment, the withstand voltage capability and current-interrupting capability of the electrode material are improved.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: August 28, 2018
    Assignee: MEIDENSHA CORPORATION
    Inventors: Keita Ishikawa, Kaoru Kitakizaki, Shota Hayashi
  • Patent number: 9959986
    Abstract: A method for producing an electrode material, provided to involve: (i) a provisional sintering step of sintering a mixed powder containing a powder of a heat resistant element and a powder of Cr to obtain a solid solution where the heat resistant element and Cr are dissolved; (ii) a pulverizing step of pulverizing the solid solution to obtain a powder; (iii) a main sintering step of sintering a molded body obtained by molding the powder of the solid solution, to produce a sintered body; and (iv) a Cu infiltration step of infiltrating the sintered body with Cu.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: May 1, 2018
    Assignee: MEIDENSHA CORPORATION
    Inventors: Kaoru Kitakizaki, Keita Ishikawa, Shota Hayashi, Nobutaka Suzuki, Kosuke Hasegawa
  • Publication number: 20170282249
    Abstract: What is disclosed is an electrode material including a sintered body containing a heat resistant element and Cr and being infiltrated with a highly conductive material. A powder mixture of a heat resistant element powder and a Cr powder is subjected to a provisional sintering in advance, thereby causing solid phase diffusion of the heat resistant element and Cr. After a Mo—Cr solid solution obtained by the provisional sintering is pulverized, the pulverized Mo—Cr solid solution powder is molded and sintered. A sintered body obtained by sintering is subjected to a HIP treatment. The highly conductive metal is disposed on the sintered body after the HIP treatment, and infiltrated into the sintered body by heating at a predetermined temperature. By conducting the HIP treatment, the withstand voltage capability and current-interrupting capability of the electrode material are improved.
    Type: Application
    Filed: August 27, 2015
    Publication date: October 5, 2017
    Applicant: MEIDENSHA CORPORATION
    Inventors: Keita ISHIKAWA, Kaoru KITAKIZAKI, Shota HAYASHI
  • Publication number: 20170232520
    Abstract: A process for producing an electrode material by infiltrating a highly conductive metal such as Cu into a porous object containing heat-resistant elements. Before an infiltration step in which the highly conductive metal is infiltrated, a HIP treatment is given to a powder containing the heat-resistant elements (or to a molded object obtained by molding a powder containing the heat-resistant elements). The composition is controlled so that the HIP treatment yields a porous object which has a degree of filling of 70% or higher, more preferably 75% or higher. The highly conductive metal is infiltrated into the porous object having the controlled composition.
    Type: Application
    Filed: May 29, 2015
    Publication date: August 17, 2017
    Applicant: MEIDENSHA CORPORATION
    Inventors: Kaoru KITAKIZAKI, Keita ISHIKAWA, Shota HAYASHI, Nobutaka SUZUKI
  • Patent number: 9724759
    Abstract: A method for producing an electrode material, involving: (i) a step of preparing a powder of a solid solution of Cr and a heat resistant material selected from the group consisting of Mo, W, Ta, Nb, V and Zr, wherein either a peak corresponding to Cr element or a peak corresponding to the heat resistant element, which are observed by X ray diffraction measurement made on the powder of the solid solution, disappears; (ii) a step of molding the powder of the solid solution to obtain a molded body and then sintering the molded body to produce a sintered body; and (iii) a Cu infiltration step of infiltrating the sintered body with Cu.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: August 8, 2017
    Assignee: MEIDENSHA CORPORATION
    Inventors: Kaoru Kitakizaki, Keita Ishikawa, Shota Hayashi, Nobutaka Suzuki, Kosuke Hasegawa
  • Patent number: 9719155
    Abstract: A composite metal where a phase of particles of solid solution is uniformly dispersed in a Cu phase, the solid solution containing a solid solution of a heat resistant element selected from Mo, W, Ta, Nb, V and Zr and Cr. The composite metal is provided to contain: 20-70% of Cu; 1.5-64% of Cr; and 6-76% of a heat resistant element by weight relative to the composite metal, wherein a remainder is comprised of inevitable impurities. In the composite metal, the particles of the solid solution, contained in the composite metal, are provided to have an average particle diameter of not larger than 20 ?m and to uniformly disperse in the Cu phase with an index of the dispersion state of not higher than 1.0.
    Type: Grant
    Filed: February 17, 2015
    Date of Patent: August 1, 2017
    Assignee: MEIDENSHA CORPORATION
    Inventors: Kaoru Kitakizaki, Keita Ishikawa, Shota Hayashi, Nobutaka Suzuki, Kosuke Hasegawa
  • Publication number: 20170069438
    Abstract: A method for producing an electrode material, provided to involve: (i) a provisional sintering step of sintering a mixed powder containing a powder of a heat resistant element and a powder of Cr to obtain a solid solution where the heat resistant element and Cr are dissolved; (ii) a pulverizing step of pulverizing the solid solution to obtain a powder; (iii) a main sintering step of sintering a molded body obtained by molding the powder of the solid solution, to produce a sintered body; and (iv) a Cu infiltration step of infiltrating the sintered body with Cu.
    Type: Application
    Filed: February 17, 2015
    Publication date: March 9, 2017
    Applicant: MEIDENSHA CORPORATION
    Inventors: Kaoru KITAKIZAKI, Keita ISHIKAWA, Shota HAYASHI, Nobutaka SUZUKI, Kosuke HASEGAWA
  • Publication number: 20170066055
    Abstract: An electrode material wherein Cr-containing particles are finely miniaturized and uniformly dispersed while a Cu portion, which is highly conductive component, is also finely miniaturized and uniformly dispersed. The electrode material is prepared, for example, by: a mixing step (S1) for mixing a Cr powder and a heat resistant element powder; a provisional sintering step (S2) for provisionally sintering the mixed powder to obtain a solid solution of Cr and the heat resistant element; a pulverizing step (S3) for pulverizing the solid solution of Cr and the heat resistant element to obtain a solid solution powder of Cr and the heat resistant element; a molding step (S4) for molding the solid solution powder; a main sintering step (S5) for performing main sintering of the obtained molded body to obtain a sintered body (skeleton) of Cr and the heat resistant element; and a Cu infiltration step (S6) for infiltrating the sintered body of Cr and the heat resistant element with Cu.
    Type: Application
    Filed: February 17, 2015
    Publication date: March 9, 2017
    Applicant: MEIDENSHA CORPORATION
    Inventors: Kaoru KITAKIZAKI, Keita ISHIKAWA, Shota HAYASHI, Nobutaka SUZUKI, Kosuke HASEGAWA
  • Publication number: 20160369373
    Abstract: A composite metal where a phase of particles of solid solution is uniformly dispersed in a Cu phase, the solid solution containing a solid solution of a heat resistant element selected from Mo, W, Ta, Nb, V and Zr and Cr. The composite metal is provided to contain: 20-70% of Cu; 1.5-64% of Cr; and 6-76% of a heat resistant element by weight relative to the composite metal, wherein a remainder is comprised of inevitable impurities. In the composite metal, the particles of the solid solution, contained in the composite metal, are provided to have an average particle diameter of not larger than 20 ?m and to uniformly disperse in the Cu phase with an index of the dispersion state of not higher than 1.0.
    Type: Application
    Filed: February 17, 2015
    Publication date: December 22, 2016
    Applicant: MEIDENSHA CORPORATION
    Inventors: Kaoru KITAKIZAKI, Keita ISHIKAWA, Shota HAYASHI, Nobutaka SUZUKI, Kosuke HASEGAWA
  • Publication number: 20160332231
    Abstract: An electrode material obtained by press molding a mixed powder where a Cu powder, a Cr powder and a refractory metal powder (for example, a Mo powder) are mixed and then sintering the thus-obtained molded body in a non-oxidizing atmosphere at a temperature that is not higher than the melting point of Cu. As the Cr powder to be mixed in the mixed powder, a Cr powder wherein the volume-based relative particle amount of particles having particle diameters of 40 ?m or less is less than 10% is used. The Cr powder is mixed in the mixed powder in an amount of 10-50% by weight, while the refractory metal powder is mixed in the mixed powder in an amount of 1-10% by weight.
    Type: Application
    Filed: January 5, 2015
    Publication date: November 17, 2016
    Applicant: MEIDENSHA CORPORATION
    Inventors: Keita ISHIKAWA, Kaoru KITAKIZAKI, Shota HAYASHI
  • Patent number: 9159488
    Abstract: [Task] The present invention aims to provide a vacuum capacitor instrument voltage transformer by which current and voltage can be much precisely measured. [Means for achieving task] The means is so made that a main capacitor portion 8 and a voltage dividing capacitor portion 10 are installed in a earthed vacuum vessel, a main ground circuit 30 is provided through which a leak current I2 flows from an outer surface of the primary line-path side vacuum vessel to the earth E, and a voltage dividing ground circuit 31 is provided through which a leak current I11 flows to the earth E through a voltage dividing insulating cylindrical member 11 that is disposed between an earthed portion and each of the main capacitor portion and the voltage dividing capacitor portion.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: October 13, 2015
    Assignees: MEIDENSHA CORPORATION, TC-TANIC, INCORPORATED
    Inventors: Toru Tanimizu, Toru Nishizawa, Toshimasa Fukai, Kaoru Kitakizaki, Takayoshi Tanimura
  • Patent number: 8755166
    Abstract: A vacuum capacitor includes a fixed electrode, a movable electrode, a movable electrode shaft, a magnetic flux receiving unit, a magnetic flux generating unit and a capacitance control unit. The fixed electrode is formed from a plurality of electrode members in a vacuum casing. The movable electrode is formed from a plurality of electrode members arranged in gaps formed between the electrode members of the fixed electrode in the vacuum casing. The movable electrode shaft supports the movable electrode. Capacitance appearing between the movable electrode and the fixed electrode is varied by rotation of the movable electrode shaft. The magnetic flux receiving unit rotates the movable electrode shaft in the vacuum casing. The magnetic flux generating unit is located outside the vacuum casing and rotates the magnetic flux receiving unit by magnetic attraction. The capacitance control unit rotates the magnetic flux generating unit.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: June 17, 2014
    Assignee: Meidensha Corporation
    Inventors: Eiichi Takahashi, Toshimasa Fukai, Toshinori Tatsumi, Yuichi Nishikiori, Kaoru Kitakizaki, Toru Tanimizu
  • Patent number: 8749946
    Abstract: A vacuum capacitor includes a fixed electrode, a movable electrode, a movable electrode shaft, a magnetic flux receiving unit, a magnetic flux generating unit and a capacitance control unit. A plurality of electrode members in a vacuum casing form the fixed electrode. The fixed electrode is divided into a plurality of fixed electrodes, and each fixed electrode is lead outside the vacuum casing and electrically connected to each other in series. A plurality of electrode members arranged in gaps between the electrode members of the fixed electrode form the movable electrode. Rotating the movable electrode shaft, which supports the movable electrode, varies capacitance between the movable electrode and the fixed electrode. The magnetic flux receiving unit rotates the movable electrode shaft. The magnetic flux generating unit, located outside the vacuum casing, rotates the magnetic flux receiving unit by magnetic attraction. The capacitance control unit rotates the magnetic flux generating unit.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: June 10, 2014
    Assignee: Meidensha Corporation
    Inventors: Eiichi Takahashi, Toshimasa Fukai, Toshinori Tatsumi, Yuichi Nishikiori, Kaoru Kitakizaki, Toru Tanimizu
  • Patent number: 8749947
    Abstract: The present invention can easily adjust capacitance of a vacuum capacitor while maintaining a vacuum state in a vacuum chamber of the vacuum capacitor. A fixed electrode 4 is formed by arranging a plurality of flat electrode members 5 in layers at a certain distance in an axial direction of a vacuum chamber 1b. A movable electrode 7 is formed by arranging a plurality of flat electrode members 8 in layers at a certain distance in the axial direction of the vacuum chamber 1b and fixing the electrode members 8 to a movable electrode shaft 9. By rotation of the movable electrode shaft 9, each electrode member 8 is inserted into and extracted from a gap between the electrode members 5 of the fixed electrode 4 in noncontact with the electrode members 5 of the fixed electrode 4. A magnetic flux receiving portion 106b is fixed to a seal member 102 side of a disk member 106a that is provided at the movable electrode shaft 9.
    Type: Grant
    Filed: March 28, 2011
    Date of Patent: June 10, 2014
    Assignee: Meidensha Corporation
    Inventors: Eiichi Takahashi, Toshimasa Fukai, Toshinori Tatsumi, Yuichi Nishikiori, Kaoru Kitakizaki
  • Publication number: 20130038978
    Abstract: The present invention can easily adjust capacitance of a vacuum capacitor while maintaining a vacuum state in a vacuum chamber of the vacuum capacitor. A fixed electrode 4 is formed by arranging a plurality of flat electrode members 5 in layers at a certain distance in an axial direction of a vacuum chamber 1b. A movable electrode 7 is formed by arranging a plurality of flat electrode members 8 in layers at a certain distance in the axial direction of the vacuum chamber 1b and fixing the electrode members 8 to a movable electrode shaft 9. By rotation of the movable electrode shaft 9, each electrode member 8 is inserted into and extracted from a gap between the electrode members 5 of the fixed electrode 4 in noncontact with the electrode members 5 of the fixed electrode 4. A magnetic flux receiving portion 106b is fixed to a seal member 102 side of a disk member 106a that is provided at the movable electrode shaft 9.
    Type: Application
    Filed: March 28, 2011
    Publication date: February 14, 2013
    Inventors: Eiichi Takahashi, Toshimasa Fukai, Toshinori Tatsumi, Yuichi Nishikiori, Kaoru Kitakizaki
  • Publication number: 20120153932
    Abstract: [Task] The present invention aims to provide a vacuum capacitor instrument voltage transformer by which current and voltage can be much precisely measured. [Means for Achieving Task] The means is so made that a main capacitor portion 8 and a voltage dividing capacitor portion 10 are installed in a earthed vacuum vessel, a main ground circuit 30 is provided through which a leak current I2 flows from an outer surface of the primary line-path side vacuum vessel to the earth E, and a voltage dividing ground circuit 31 is provided through which a leak current I11 flows to the earth E through a voltage dividing insulating cylindrical member 11 that is disposed between an earthed portion and each of the main capacitor portion and the voltage dividing capacitor portion.
    Type: Application
    Filed: September 1, 2010
    Publication date: June 21, 2012
    Inventors: Toru Tanimizu, Toru Nishizawa, Toshimasa Fukai, Kaoru Kitakizaki, Takayoshi Tanimura
  • Publication number: 20110235231
    Abstract: [Object] An object of the present invention is to provide a vacuum capacitor, a vacuum state of a vacuum chamber of which is maintained without bellows etc., and whose capacitance is easily adjustable, and a decrease of life of which is lessened. [Means to Solve] A fixed electrode 4 is formed by arranging a plurality of flat electrode members 5 in layers at a certain distance in an axial direction of a vacuum chamber 1b in the vacuum chamber 1b.
    Type: Application
    Filed: November 19, 2009
    Publication date: September 29, 2011
    Inventors: Eiichi Takahashi, Toshimasa Fukai, Toshinori Tatsumi, Yuichi Nishikiori, Kaoru Kitakizaki, Toru Tanimizu