Patents by Inventor Hirotaka Muto
Hirotaka Muto 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: 11825601Abstract: A substrate with a conductive layer including a substrate, which is a woven or nonwoven fabric containing polytetrafluoroethylene (PTFE) nanofibers; and a conductive layer formed on the substrate, the conductive layer being formed from a conductive composition with a viscosity in a range of 1 to 500 Pa·s measured at 25° C. with a rotational viscometer at a rotational speed of 50 rpm, wherein the following requirement (1) is satisfied: requirement (1); the substrate with a conductive layer has a Gurley permeability of 10 s/100 ml or less.Type: GrantFiled: September 1, 2022Date of Patent: November 21, 2023Assignee: VALQUA, LTD.Inventors: Tetsuya Komeda, Hirotaka Muto
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Publication number: 20230119794Abstract: A hydrophilic fluororesin tube includes a tube wall that contains a fluororesin fiber deposited to form a nonwoven fabric, and satisfies the following requirement (1): requirement (1); the tube wall of the hydrophilic fluororesin tube demonstrating an average transmittance, when immersed in water at 25° C. for 1 minute, of 40% or larger at 400 to 700 nm wavelength.Type: ApplicationFiled: October 14, 2022Publication date: April 20, 2023Inventors: Yoshihiro Setoguchi, Naoki Watanabe, Hirotaka Muto
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Publication number: 20230074201Abstract: A substrate with a conductive layer including a substrate, which is a woven or nonwoven fabric containing polytetrafluoroethylene (PTFE) nanofibers; and a conductive layer formed on the substrate, the conductive layer being formed from a conductive composition with a viscosity in a range of 1 to 500 Pa·s measured at 25° C. with a rotational viscometer at a rotational speed of 50 rpm, wherein the following requirement (1) is satisfied: requirement (1); the substrate with a conductive layer has a Gurley permeability of 10 s/100 ml or less.Type: ApplicationFiled: September 1, 2022Publication date: March 9, 2023Inventors: Tetsuya Komeda, Hirotaka Muto
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Patent number: 9957170Abstract: A water treatment device generates a bubble in water to be treated inside a treatment tank, and treats the water to be treated through use of radicals that are generated by bubble electric discharge caused via the bubble. The water treatment device includes main electrodes for forming a main discharge area between a first main electrode and a second main electrode, auxiliary electrodes for forming a preliminary discharge area between a first auxiliary electrode and a second auxiliary electrode, and a bubble generator generating a bubble in water to be treated through use of an externally supplied gas. When a bubble generated by the bubble generator passes through the preliminary discharge area, discharge is caused via the bubble, and, when the bubble in an excited state subsequently passes through the main discharge area, the bubble causes discharge again to generate radicals.Type: GrantFiled: November 7, 2013Date of Patent: May 1, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Yasuhiro Nakamura, Yasutaka Inanaga, Akira Morikawa, Tokiko Yamauchi, Takao Tsurimoto, Hirotaka Muto, Gaku Oinuma, Masakazu Taki
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Patent number: 9797955Abstract: An insulation inspection device for motors includes an inverter for driving a motor, a partial discharge detecting unit for determining soundness of the motor, and a control circuit for controlling the inverter. The control circuit adjusts a switching interval of a voltage pulse of the inverter so as to be equal to a pulse round-trip propagation time between the inverter and the motor, thereby generating surge voltage higher than driving voltage for the motor, between the motor and ground, and adjusts a switching time for each phase of the inverter, thereby generating surge voltage higher than driving voltage for the motor, between phases, thus performing insulation inspection.Type: GrantFiled: April 17, 2013Date of Patent: October 24, 2017Assignee: Mitsubishi Electric CorporationInventors: Shinichi Okada, Hiroki Shiota, Hirotaka Muto
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Patent number: 9335380Abstract: The invention is related to a device for detecting insulation degradation in an inverter-driven load device, in particular a motor, the device including: zero-phase current measuring means for measuring a zero-phase current in power-feed lines, provided in the power-feed lines between an inverter device and the motor; and command control means for putting rotation of the motor on standby; wherein the zero-phase current measuring means measures the total of phase currents fed into respective phases so as not to rotate a shaft even when an external force is applied to the shaft during the rotation being on standby, whereby allowing regular detection of insulation degradation without switching over the power-feed lines connected with the load device.Type: GrantFiled: February 8, 2010Date of Patent: May 10, 2016Assignee: Mitsubishi Electric CorporationInventors: Yoshimasa Watanabe, Ryuichi Nishiura, Yoshiharu Kaneda, Hiroshi Nishizawa, Toru Oka, Hirotaka Muto, Toshiki Tanaka, Yoji Tsutsumishita
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Publication number: 20150251933Abstract: A water treatment device generates a bubble in water to be treated inside a treatment tank, and treats the water to be treated through use of radicals that are generated by bubble electric discharge caused via the bubble. The water treatment device includes main electrodes for forming a main discharge area between a first main electrode and a second main electrode, auxiliary electrodes for forming a preliminary discharge area between a first auxiliary electrode and a second auxiliary electrode, and a bubble generator generating a bubble in water to be treated through use of an externally supplied gas. When a bubble generated by the bubble generator passes through the preliminary discharge area, discharge is caused via the bubble, and, when the bubble in an excited state subsequently passes through the main discharge area, the bubble causes discharge again to generate radicals.Type: ApplicationFiled: November 7, 2013Publication date: September 10, 2015Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yasuhiro Nakamura, Yasutaka Inanaga, Akira Morikawa, Tokiko Yamauchi, Takao Tsurimoto, Hirotaka Muto, Gaku Oinuma, Masakazu Taki
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Publication number: 20150247901Abstract: An insulation inspection device for motors includes an inverter for driving a motor, a partial discharge detecting unit for determining soundness of the motor, and a control circuit for controlling the inverter. The control circuit adjusts a switching interval of a voltage pulse of the inverter so as to be equal to a pulse round-trip propagation time between the inverter and the motor, thereby generating surge voltage higher than driving voltage for the motor, between the motor and ground, and adjusts a switching time for each phase of the inverter, thereby generating surge voltage higher than driving voltage for the motor, between phases, thus performing insulation inspection.Type: ApplicationFiled: April 17, 2013Publication date: September 3, 2015Applicant: Mitsubishi Electric CorporationInventors: Shinichi Okada, Hiroki Shiota, Hirotaka Muto
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Patent number: 8854068Abstract: An object of the invention is to provide a diagnostic method for an oil-filled electrical device that considers a temperature distribution in the oil-filled electrical device and enables accurate diagnosis to be conducted even when the method is applied to diagnosis of an actually operating device, and further provide a method with which such diagnosis of an oil-filled electrical device can be conducted from a component analysis value of an insulating oil in the oil-filled electrical device. The invention is a diagnostic method for an oil-filled electrical device including in an insulating oil a metal part wrapped with insulating paper, and determines that a time when a surface resistivity of a maximum precipitation site where metal sulfide is most precipitated on the insulating paper reaches a preset surface resistivity management value is a time of occurrence of an abnormality.Type: GrantFiled: August 18, 2008Date of Patent: October 7, 2014Assignee: Mitsubishi Electric CorporationInventors: Eiichi Nagao, Kentaro Taninouchi, Noboru Hosokawa, Tsuyoshi Amimoto, Kozo Tachibana, Hirotaka Muto, Junji Tanimura, Satoru Toyama
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Publication number: 20140290978Abstract: A lead wire for a stationary induction apparatus includes a conductor, a covering insulating layer provided on an outer periphery of the conductor, and an insulating sheet provided on the covering insulating layer. The insulating sheet includes base paper having a prescribed width, and insulating spacers disposed to protrude from the base paper at prescribed spacings in a longitudinal direction of the base paper. The insulating sheet is spirally wound continuously from a straight portion to a curved portion such that the insulating spacers come into contact with the covering insulating layer.Type: ApplicationFiled: December 12, 2012Publication date: October 2, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yuta Kihara, Takayuki Fujimoto, Kiyoyuki Ishikawa, Soichiro Kainaga, Hirotaka Muto, Takao Tsurimoto
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Patent number: 8547193Abstract: In a stationary induction apparatus, an inter-partial-coil insulating plate and a plurality of inter-partial-coil spacer insulators form a refrigerant flow path in conjunction with each other. A space having an inter-partial-coil insulation dimension for withstanding an abnormal voltage is formed between a pair of partial coils. The inter-partial-coil insulating plate and the inter-partial-coil spacer insulators support both the pair of partial coils at an insulated state so as to maintain the inter-partial-coil insulation dimension. The insulators are arranged so as to be overlapped with each other in the direction in which mutually adjacent partial coils are opposed to each other.Type: GrantFiled: October 18, 2010Date of Patent: October 1, 2013Assignee: Mitsubishi Electric CorporationInventors: Soichiro Kainaga, Takao Tsurimoto, Takahiko Ishikura, Hirotaka Muto, Hiroki Otera, Tetsuya Matsuda, Koji Kise, Noboru Hosokawa, Kiyoyuki Ishikawa, Koji Shinya, Ryuichi Nishiura
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Patent number: 8456264Abstract: In a stationary induction apparatus, an inter-partial-coil insulating plate and a plurality of inter-partial-coil spacer insulators form a refrigerant flow path in conjunction with each other. A space having an inter-partial-coil insulation dimension for withstanding an abnormal voltage is formed between a pair of partial coils. The inter-partial-coil insulating plate and the inter-partial-coil spacer insulators support both the pair of partial coils at an insulated state so as to maintain the inter-partial-coil insulation dimension. The insulators are arranged so as to be overlapped with each other in the direction in which mutually adjacent partial coils are opposed to each other.Type: GrantFiled: October 18, 2010Date of Patent: June 4, 2013Assignee: Mitsubishi Electric CorporationInventors: Soichiro Kainaga, Takao Tsurimoto, Takahiko Ishikura, Hirotaka Muto, Hiroki Otera, Tetsuya Matsuda, Koji Kise, Noboru Hosokawa, Kiyoyuki Ishikawa, Koji Shinya, Ryuichi Nishiura
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Publication number: 20120161912Abstract: In a stationary induction apparatus, an inter-partial-coil insulating plate and a plurality of inter-partial-coil spacer insulators form a refrigerant flow path in conjunction with each other. A space having an inter-partial-coil insulation dimension for withstanding an abnormal voltage is formed between a pair of partial coils. The inter-partial-coil insulating plate and the inter-partial-coil spacer insulators support both the pair of partial coils at an insulated state so as to maintain the inter-partial-coil insulation dimension. The insulators are arranged so as to be overlapped with each other in the direction in which mutually adjacent partial coils are opposed to each other.Type: ApplicationFiled: October 18, 2010Publication date: June 28, 2012Applicant: Mitsubishi Electric CorporationInventors: Soichiro Kainaga, Takao Tsurimoto, Takahiko Ishikura, Hirotaka Muto, Hiroki Otera, Tetsuya Matsuda, Koji Kise, Noboru Hosokawa, Kiyoyuki Ishikawa, Koji Shinya, Ryuichi Nishiura
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Publication number: 20110320146Abstract: The invention is related to a device for detecting insulation degradation in an inverter-driven load device, in particular a motor, the device including: zero-phase current measuring means for measuring a zero-phase current in power-feed lines, provided in the power-feed lines between an inverter device and the motor; and command control means for putting rotation of the motor on standby; wherein the zero-phase current measuring means measures the total of phase currents fed into respective phases so as not to rotate a shaft even when an external force is applied to the shaft during the rotation being on standby, whereby allowing regular detection of insulation degradation without switching over the power-feed lines connected with the load device.Type: ApplicationFiled: February 8, 2010Publication date: December 29, 2011Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Yoshimasa Watanabe, Ryuichi Nishiura, Yoshiharu Kaneda, Hiroshi Nishizawa, Toru Oka, Hirotaka Muto, Toshiki Tanaka, Yoji Tsutsumishita
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Publication number: 20110084716Abstract: An object of the invention is to provide a diagnostic method for an oil-filled electrical device that considers a temperature distribution in the oil-filled electrical device and enables accurate diagnosis to be conducted even when the method is applied to diagnosis of an actually operating device, and further provide a method with which such diagnosis of an oil-filled electrical device can be conducted from a component analysis value of an insulating oil in the oil-filled electrical device. The invention is a diagnostic method for an oil-filled electrical device including in an insulating oil a metal part wrapped with insulating paper, and determines that a time when a surface resistivity of a maximum precipitation site where metal sulfide is most precipitated on the insulating paper reaches a preset surface resistivity management value is a time of occurrence of an abnormality.Type: ApplicationFiled: August 18, 2008Publication date: April 14, 2011Applicant: Mitsubishi Electric CorporationInventors: Eiichi Nagao, Kentaro Taninouchi, Noboru Hosokawa, Tsuyoshi Amimoto, Kozo Tachibana, Hirotaka Muto, Junji Tanimura, Satoru Toyama
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Patent number: 7868436Abstract: A semiconductor device includes an insulator substrate mounted on a base plate, the insulator substrate having an upper electrode, semiconductor chips mounted on the insulator substrate, external terminals for establishing external electrical connections of the semiconductor device, wires for establishing electrical connections among the external terminals, the upper electrode and the semiconductor chips, a case accommodating the insulator substrate, the semiconductor chips, the external terminals and the wires which are sealed by a sealing material filled in the case, a lid for protecting an upper part of the sealing material, and an insulative low electrification covering fitted on each wire, the low electrification covering having a lesser tendency to produce an electric charge buildup than the sealing material.Type: GrantFiled: April 30, 2007Date of Patent: January 11, 2011Assignee: Mitsubishi Electric CorporationInventors: Hiroki Shiota, Hirotaka Muto, Tetsuo Mizoshiri
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Patent number: 7554780Abstract: In an inverter system including of an electric-power converter and an ac rotating machine, over-voltage generated in the ac rotating machine is controlled by a low-cost system configuration. The system includes: an electric-power converter; a three-phase ac rotating machine; and a four-core non-coaxial cable, having a ground line and three-phase electric-power supplying lines, connecting the electric-power converter to the three-phase ac rotating machine. One or two capacitors are connected between the ground line and one or two of the electric-power supplying lines, at electric-power supplying terminals on the rotating machine, so that respective capacitances between the three-phase electric-power supplying lines and the ground line are approximately equal to each other.Type: GrantFiled: November 2, 2005Date of Patent: June 30, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kotaro Wada, Hirotaka Muto, Kosei Tsuji, Osamu Yashiro
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Publication number: 20070284719Abstract: A semiconductor device includes an insulator substrate mounted on a base plate, the insulator substrate having an upper electrode, semiconductor chips mounted on the insulator substrate, external terminals for establishing external electrical connections of the semiconductor device, wires for establishing electrical connections among the external terminals, the upper electrode and the semiconductor chips, a case accommodating the insulator substrate, the semiconductor chips, the external terminals and the wires which are sealed by a sealing material filled in the case, a lid for protecting an upper part of the sealing material, and an insulative low electrification covering fitted on each wire, the low electrification covering having a lesser tendency to produce an electric charge buildup than the sealing material.Type: ApplicationFiled: April 30, 2007Publication date: December 13, 2007Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Hiroki Shiota, Hirotaka Muto, Tetsuo Mizoshiri
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Patent number: 7058305Abstract: An optical submarine communication system has a land cable connected to a terminal apparatus which is installed on land near the seashore for transmitting an optical signal and electric power. The land cable is connected to an optical submarine cable through a beach manhole, and a repeater is connected to the optical submarine cable. The optical submarine communication system has a surge suppressor provided on the land cable, whereby a surge generated from the terminal apparatus side because of a lightning stroke or an insulation failure is suppressed and prevented from reaching and damaging the repeater.Type: GrantFiled: August 16, 2002Date of Patent: June 6, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Katsuhiko Horinouchi, Hirotaka Muto, Satoshi Kumayasu, Masaki Nakaoka
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Publication number: 20060113951Abstract: In an inverter system including of an electric-power converter and an ac rotating machine, over-voltage generated in the ac rotating machine is controlled by a low-cost system configuration. The system includes: an electric-power converter; a three-phase ac rotating machine; and a four-core non-coaxial cable, having a ground line and three-phase electric-power supplying lines, connecting the electric-power converter to the three-phase ac rotating machine. One or two capacitors are connected between the ground line and one or two of the electric-power supplying lines, at electric-power supplying terminals on the rotating machine, so that respective capacitances between the three-phase electric-power supplying lines and the ground line are approximately equal to each other.Type: ApplicationFiled: November 2, 2005Publication date: June 1, 2006Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Kotaro Wada, Hirotaka Muto, Kosei Tsuji, Osamu Yashiro