Patents by Inventor Kenta Yamamura
Kenta Yamamura 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).
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Patent number: 11862417Abstract: A vacuum interrupter is equipped with a vacuum container and fixed and movable electrodes provided in the vacuum container. The vacuum container is constructed by hermetically respectively joining fixed-side and movable-side end plates to one and the other end portions of an insulating tube. The insulating tube is equipped at its end portion with a projection portion that projects in an axial direction of the insulating tube along an outer periphery of the insulating tube. The insulating tube is equipped at its end portion with an end plate joining portion that projects from a base end portion of the projection portion inwardly in a radial direction of the insulating tube. The end plate joining portion is equipped on its surface with a metallized layer to which the fixed-side or movable-side end plate is joined by brazing.Type: GrantFiled: February 6, 2019Date of Patent: January 2, 2024Assignees: MEIDENSHA CORPORATION, SECHERON SAInventors: Kenta Yamamura, Takaaki Furuhata, Hideki Komatsu, Kosuke Hasegawa, Tetsuya Kanno, Bjorn Fischer, Tarek Lamara, Claudio Tricarico
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Publication number: 20220108854Abstract: A vacuum interrupter (1) is equipped with a vacuum container (2) and a fixed electrode (3) and a movable electrode (4), which are provided in the vacuum container (2). The vacuum container (2) is constructed by hermetically joining a fixed-side end plate (6) to one end portion of an insulating tube (5) and by hermetically joining a movable-side end plate (7) to the other end portion of the insulating tube (5). The insulating tube (5) is equipped at its end portion with a projection portion (5a) that projects in an axial direction of the insulating tube (5) along an outer periphery of the insulating tube (5). The insulating tube (5) is equipped at its end portion with an end plate joining portion (5b) that projects from a base end portion of the projection portion (5a) in an inner peripheral direction of the insulating tube (5).Type: ApplicationFiled: February 6, 2019Publication date: April 7, 2022Applicants: MEIDENSHA CORPORATION, SECHERON SAInventors: Kenta YAMAMURA, Takaaki FURUHATA, Hideki KOMATSU, Kosuke HASEGAWA, Tetsuya KANNO, Bjorn FISCHER, Tarek LAMARA, Claudio TRICARICO
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Patent number: 10766069Abstract: There is disclosed a method for manufacturing an electrode by pressing and sintering a mixed powder of a solid solution powder of Cr and a heat-resistant element, which contains Cr and the heat-resistant element in a ratio such that Cr is greater than the heat-resistant element by weight, a Cu powder, and a low melting metal powder (Bi, Sn, Se, Pb, etc.). The low melting metal powder of 0.30 weight % to 0.50 weight % is added to a mixed powder of a solid solution powder of Cr and the heat-resistant element and the Cu powder, and then a mixed powder prepared by adding the low melting metal powder is sintered at a temperature of from 1010° C. to 1035° C. As the low melting metal powder, there is used a powder having a median size of from 5 ?m to 20 ?m.Type: GrantFiled: March 15, 2017Date of Patent: September 8, 2020Assignee: MEIDENSHA CORPORATIONInventors: Shota Hayashi, Keita Ishikawa, Kenta Yamamura, Kosuke Hasegawa, Hideaki Fukuda, Akira Sano
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Patent number: 10614969Abstract: Disclosed is a method for manufacturing an electrode material (1), wherein the electrode material includes: a center part (2) containing Cu, Cr and a heat resistant element and having superior large-current interruption and capacitor switching capabilities; and an outer circumferential part (3) disposed on an outer circumference of the center part (2). The outer circumferential part (3) contains Cu and Cr and has superior withstand voltage capability. The electrode material (1) is manufactured by molding a solid solution powder of Cr and the heat resistant element, molding a Cr powder integrally around an outer circumference of the molded body of the solid solution powder and infiltrating the integrally molded body with Cu etc.Type: GrantFiled: November 8, 2017Date of Patent: April 7, 2020Assignee: MEIDENSHA CORPORATIONInventors: Keita Ishikawa, Shota Hayashi, Hideaki Fukuda, Kosuke Hasegawa, Kenta Yamamura
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Publication number: 20190362910Abstract: Disclosed is a method for manufacturing an electrode material (1), wherein the electrode material includes: a center part (2) containing Cu, Cr and a heat resistant element and having superior large-current interruption and capacitor switching capabilities; and an outer circumferential part (3) disposed on an outer circumference of the center part (2). The outer circumferential part (3) contains Cu and Cr and has superior withstand voltage capability. The electrode material (1) is manufactured by molding a solid solution powder of Cr and the heat resistant element, molding a Cr powder integrally around an outer circumference of the molded body of the solid solution powder and infiltrating the integrally molded body with Cu etc.Type: ApplicationFiled: November 8, 2017Publication date: November 28, 2019Applicant: MEIDENSHA CORPORATIONInventors: Keita ISHIKAWA, Shota HAYASHI, Hideaki FUKUDA, Kosuke HASEGAWA, Kenta YAMAMURA
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Patent number: 10490367Abstract: It is a method for manufacturing an electrode material containing Cu, Cr, a heat-resistant element, and a low melting metal. A Cr powder and a heat-resistant element powder are mixed together in a ratio such that the Cr is greater than the heat-resistant element by weight. The mixed powder of the heat-resistant element and the Cr powder is baked. A MoCr solid solution obtained by the baking and containing a solid solution of the heat-resistant element and the Cr is pulverized and then classified. The classified MoCr solid solution powder, a Cu powder, and a low-melting metal powder are mixed together, followed by sintering at a temperature that is 1010° C. or higher and is lower than 1038° C., thereby obtaining the electrode material.Type: GrantFiled: June 21, 2016Date of Patent: November 26, 2019Assignee: MEIDENSHA CORPORATIONInventors: Shota Hayashi, Keita Ishikawa, Kenta Yamamura, Kosuke Hasegawa
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Publication number: 20190299285Abstract: There is disclosed a method for manufacturing an electrode by pressing and sintering a mixed powder of a solid solution powder of Cr and a heat-resistant element, which contains Cr and the heat-resistant element in a ratio such that Cr is greater than the heat-resistant element by weight, a Cu powder, and a low melting metal powder (Bi, Sn, Se, Pb, etc.). The low melting metal powder of 0.30 weight % to 0.50 weight % is added to a mixed powder of a solid solution powder of Cr and the heat-resistant element and the Cu powder, and then a mixed powder prepared by adding the low melting metal powder is sintered at a temperature of from 1010° C. to 1035° C. As the low melting metal powder, there is used a powder having a median size of from 5 ?m to 20 ?m.Type: ApplicationFiled: March 15, 2017Publication date: October 3, 2019Applicant: MEIDENSHA CORPORATIONInventors: Shota HAYASHI, Keita ISHIKAWA, Kenta YAMAMURA, Kosuke HASEGAWA, Hideaki FUKUDA, Akira SANO
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Patent number: 10361039Abstract: It is an electrode material that is used as an electrode contact of a vacuum interrupter and that contains one or more parts by weight of a heat-resistant element and one part by weight of Cr, the remainder being Cu and an unavoidable impurity. A part of Cr powder and the heat-resistant element powder are mixed together, and this mixed powder is sintered such that a peak corresponding to Cr element disappears in X-ray diffraction measurement. A solid solution powder obtained by pulverizing a sintered body of the heat-resistant element and Cr obtained by the sintering is mixed with the remaining Cr powder, and this mixed powder is shaped and then sintered. A sintered body obtained by this sintering is infiltrated with Cu.Type: GrantFiled: August 10, 2016Date of Patent: July 23, 2019Assignee: MEIDENSHA CORPORATIONInventors: Keita Ishikawa, Kenta Yamamura, Kosuke Hasegawa, Shota Hayashi, Takaaki Furuhata
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Patent number: 10153098Abstract: It is a method for producing an electrode material containing Cu, Cr and a heat-resistant element. A heat-resistant element powder and a Cr powder are mixed together such that the heat-resistant element is less than the Cr by weight. A resulting mixed powder is baked. A resulting sintered body containing a solid solution of the heat-resistant element and the Cr is pulverized, and a resulting solid solution powder is classified, to have a particle size of 200 ?m or less. 10-60 parts by weight of the classified solid solution powder and 90-40 parts by weight of a Cu powder are mixed together, followed by sintering to obtain the electrode material. If a low melting metal powder having a median size of 5-40 ?m is mixed with a mixed powder of the solid solution powder and the Cu powder, the deposition resistance property is further improved.Type: GrantFiled: April 26, 2016Date of Patent: December 11, 2018Assignee: MEIDENSHA CORPORATIONInventors: Shota Hayashi, Keita Ishikawa, Takaaki Furuhata, Kenta Yamamura, Kosuke Hasegawa
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Publication number: 20180240612Abstract: It is an electrode material that is used as an electrode contact of a vacuum interrupter and that contains one or more parts by weight of a heat-resistant element and one part by weight of Cr, the remainder being Cu and an unavoidable impurity. A part of Cr powder and the heat-resistant element powder are mixed together, and this mixed powder is sintered such that a peak corresponding to Cr element disappears in X-ray diffraction measurement. A solid solution powder obtained by pulverizing a sintered body of the heat-resistant element and Cr obtained by the sintering is mixed with the remaining Cr powder, and this mixed powder is shaped and then sintered. A sintered body obtained by this sintering is infiltrated with Cu.Type: ApplicationFiled: August 10, 2016Publication date: August 23, 2018Applicant: MEIDENSHA CORPORATIONInventors: Keita ISHIKAWA, Kenta YAMAMURA, Kosuke HASEGAWA, Shota HAYASHI, Takaaki FURUHATA
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Publication number: 20180182573Abstract: It is a method for manufacturing an electrode material containing Cu, Cr, a heat-resistant element, and a low melting metal. A Cr powder and a heat-resistant element powder are mixed together in a ratio such that the Cr is greater than the heat-resistant element by weight. The mixed powder of the heat-resistant element and the Cr powder is baked. A MoCr solid solution obtained by the baking and containing a solid solution of the heat-resistant element and the Cr is pulverized and then classified. The classified MoCr solid solution powder, a Cu powder, and a low-melting metal powder are mixed together, followed by sintering at a temperature that is 1010° C. or higher and is lower than 1038° C., thereby obtaining the electrode material.Type: ApplicationFiled: June 21, 2016Publication date: June 28, 2018Applicant: MEIDENSHA CORPORATIONInventors: Shota HAYASHI, Keita ISHIKAWA, Kenta YAMAMURA, Kosuke HASEGAWA
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Publication number: 20180174771Abstract: It is a method for producing an electrode material containing Cu, Cr and a heat-resistant element. A heat-resistant element powder and a Cr powder are mixed together in a ratio such that the heat-resistant element is less than the Cr by weight. A mixed powder of the heat-resistant element powder and the Cr powder is baked. A sintered body obtained by the baking and containing a solid solution of the heat-resistant element and the Cr is pulverized, and a solid solution powder obtained by the pulverizing is classified, to have a particle size of 200 ?m or less. 10-60 parts by weight of the classified solid solution powder and 90-40 parts by weight of a Cu powder are mixed together, followed by sintering to obtain the electrode material. If a low melting metal powder having a median size of 5-40 ?m is mixed with a mixed powder of the solid solution powder and the Cu powder, the deposition resistance property is further improved.Type: ApplicationFiled: April 26, 2016Publication date: June 21, 2018Applicant: MEIDENSHA CORPORATIONInventors: Shota HAYASHI, Keita ISHIKAWA, Takaaki FURUHATA, Kenta YAMAMURA, Kosuke HASEGAWA
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Publication number: 20170291452Abstract: Provided is a pneumatic tire vulcanizing method which includes the steps of setting a green tire in a mold, inserting a bladder inside the green tire, and expanding the bladder to press the bladder to an outer side in the tire radial direction and perform vulcanization molding. The bladder is expanded with a rigidity reinforcement ring interposed between an inner circumferential surface of a region of the green tire corresponding to a tread portion and an outer circumferential surface of a region of the bladder corresponding to the tread portion.Type: ApplicationFiled: August 20, 2015Publication date: October 12, 2017Applicant: The Yokohama Rubber Co., LTD.Inventors: Hajime Satoh, Kenta Yamamura
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Patent number: D680971Type: GrantFiled: May 26, 2011Date of Patent: April 30, 2013Assignee: Japan AE Power Systems CorporationInventors: Takaaki Furuhata, Yoshihiro Tahara, Hideki Komatsu, Kenta Yamamura, Akira Katayama