Patents by Inventor Ryotaro Harada
Ryotaro Harada 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: 11970442Abstract: To achieve a method for producing a carbonic ester at a high yield by a simple process while suppressing formation of by-products, for example, a method for producing an aliphatic carbonic ester. The above problem is solved by a method for producing a carbonic ester, the method including a carbonic ester formation reaction in which an alcohol and carbon dioxide are reacted in the presence of an aromatic nitrile compound and a catalyst, wherein the water content in the alcohol used in the carbonic ester formation reaction is 0.10% by mass or less.Type: GrantFiled: January 8, 2019Date of Patent: April 30, 2024Assignee: MITSUBISHI GAS CHEMICAL COMPANY, INC.Inventors: Hidefumi Harada, Takehiko Isobe, Hongyu Liu, Yousuke Shinkai, Ryotaro Umezu
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Patent number: 10066036Abstract: [Problem] To provide an ethylene-?-olefin copolymer that is highly effective in improving the molding properties of polyolefin resins, improving the balance between impact strength and stiffness, and improving transparency. [Solution] Provided is an ethylene-?-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.Type: GrantFiled: March 31, 2015Date of Patent: September 4, 2018Assignee: JAPAN POLYETHYLENE CORPORATIONInventors: Yoshiyuki Ishihama, Ryotaro Harada, Masaru Aoki, Kenji Iiba, Kazushi Kodama, Hiroto Hayashi
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Patent number: 10066037Abstract: [Problem] To provide an ethylene-?-olefin copolymer that is highly effective in improving the molding properties of polyolefin resins and at the same time highly effective improving the balance between impact strength and stiffness. [Solution] Provided is an ethylene-?-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.Type: GrantFiled: March 31, 2015Date of Patent: September 4, 2018Assignee: JAPAN POLYETHYLENE CORPORATIONInventors: Yoshiyuki Ishihama, Ryotaro Harada, Masaru Aoki, Kenji Iiba, Kazushi Kodama, Hiroto Hayashi
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Patent number: 10033274Abstract: A range calculator (12) calculates an operation value range, which is range of an operation value tor controlling a duty cycle of a chopper circuit (4) based on an input voltage and output voltage command value of the chopper circuit (4). A chopper circuit control device (1) controls the duty cycle of the chopper circuit (4) by using an upper limit value of the operation value range when an operation value is greater than or equal to the upper limit value of the operation value range, by using the operation value when the operation value is within the operation value range, and by using a lower limit value of the operation value range when the operation value is less than or equal to the lower limit value of the operation value range.Type: GrantFiled: October 2, 2014Date of Patent: July 24, 2018Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kota Takagaki, Ryotaro Harada
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Patent number: 9963525Abstract: [Problem] To provide an ethylene-?-olefin copolymer having high mechanical strength and good molding properties. [Solution] Provided is an ethylene-?-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.Type: GrantFiled: March 31, 2015Date of Patent: May 8, 2018Assignee: JAPAN POLYETHYLENE CORPORATIONInventors: Yoshiyuki Ishihama, Ryotaro Harada, Masaru Aoki, Kenji Iiba, Kazushi Kodama, Hiroto Hayashi
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Patent number: 9853568Abstract: The resonant inverter circuit includes two or more switch elements. A detector detects an output current of the switch elements. A resonance frequency determiner determines that the resonance frequency of the resonant inverter circuit is abnormal when a number of times an absolute value of a current detected by the detector at turn-off of the switch elements is equal to or greater than a threshold is equal to or greater than a predetermined number of times that is two or more during a predetermined period that is equal to or longer than two switching periods of the switch elements. A controller causes the resonant inverter circuit to stop a switching operation when the resonance frequency determiner determines that the resonance frequency of the resonant inverter circuit is abnormal.Type: GrantFiled: November 27, 2013Date of Patent: December 26, 2017Assignee: MITSUBISHI ELECTRIC CORPORATIONInventor: Ryotaro Harada
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Patent number: 9845011Abstract: An auxiliary power source device for a vehicle is incorporated in an electric vehicle and includes a three-phase inverter that converts an input DC voltage into a desired three-phase AC voltage and applies the three-phase AC voltage to a load. The auxiliary power source device further includes a filter reactor that is connected to respective output terminals of a three-phase inverter, a filter capacitor that is connected in a Y-shape at an end on a load side of the filter reactor and is not grounded at a neutral point, and a three-phase transformer that includes primary windings that are connected in a Y-shape at the end on the load side of the filter reactor and is grounded at a neutral point and secondary windings that are connected in a delta shape.Type: GrantFiled: November 24, 2011Date of Patent: December 19, 2017Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryotaro Harada, Takeshi Tanaka
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Publication number: 20170302155Abstract: A range calculator (12) calculates an operation value range, which is range of an operation value for controlling a duty cycle of a chopper circuit (4) based on an input voltage and output voltage command value of the chopper circuit (4). A chopper circuit control device (1) controls the duty cycle of the chopper circuit (4) by using an upper limit value of the operation value range when an operation value is greater than or equal to the upper limit value of the operation value range, by using the operation value when the operation value is within the operation value range, and by using a lower limit value of the operation value range when the operation value is less than or equal to the lower limit value of the operation value range.Type: ApplicationFiled: October 2, 2014Publication date: October 19, 2017Applicant: Mitsubishi Electric CorporationInventors: Kota TAKAGAKI, Ryotaro HARADA
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Publication number: 20170114165Abstract: [Problem] To provide an ethylene-?-olefin copolymer having high mechanical strength and good molding properties. [Solution] Provided is an ethylene-?-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.Type: ApplicationFiled: March 31, 2015Publication date: April 27, 2017Applicant: JAPAN POLYETHYLENE CORPORATIONInventors: Yoshiyuki ISHIHAMA, Ryotaro HARADA, Masaru AOKI, Kenji IIBA, Kazushi KODAMA, Hiroto HAYASHI
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Publication number: 20170101490Abstract: [Problem] To provide an ethylene-?-olefin copolymer that is highly effective in improving the molding properties of polyolefin resins, improving the balance between impact strength and stiffness, and improving transparency. [Solution] Provided is an ethylene-?-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.Type: ApplicationFiled: March 31, 2015Publication date: April 13, 2017Applicant: JAPAN POLYETHYLENE CORPORATIONInventors: Yoshiyuki ISHIHAMA, Ryotaro HARADA, Masaru AOKI, Kenji IIBA, Kazushi KODAMA, Hiroto HAYASHI
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Publication number: 20170101491Abstract: [Problem] To provide an ethylene-?-olefin copolymer that is highly effective in improving the molding properties of polyolefin resins and at the same time highly effective improving the balance between impact strength and stiffness. [Solution] Provided is an ethylene-?-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.Type: ApplicationFiled: March 31, 2015Publication date: April 13, 2017Applicant: JAPAN POLYETHYLENE CORPORATIONInventors: Yoshiyuki ISHIHAMA, Ryotaro HARADA, Masaru AOKI, Kenji IIBA, Kazushi KODAMA, Hiroto HAYASHI
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Patent number: 9595886Abstract: A vehicle auxiliary power supply device includes a resonant inverter circuit that converts DC input into a desired AC voltage and outputs the AC voltage and a control unit. The control unit includes a resonance-time managing unit managing resonance time of current flowing in the resonant inverter circuit, a gate-off-command generating unit detecting overcurrent flowing in the resonant inverter circuit based on detected current of a current detector, and, when the overcurrent is detected, generating, based on detected current of the current detector and resonance time managed by the resonance-time managing unit, a gate-off command to turn off switching elements included in the resonant inverter circuit after the elapse of time after which current flowing in the switching elements becomes zero for the first time, and a gate-signal generating unit generating a gate signal that controls the switching elements to be turned off when the gate-off command is input.Type: GrantFiled: November 28, 2011Date of Patent: March 14, 2017Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Masato Achihara, Ryotaro Harada
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Publication number: 20160276955Abstract: The resonant inverter circuit includes two or more switch elements. A detector detects an output current of the switch elements. A resonance frequency determiner determines that the resonance frequency of the resonant inverter circuit is abnormal when a number of times an absolute value of a current detected by the detector at turn-off of the switch elements is equal to or greater than a threshold is equal to or greater than a predetermined number of times that is two or more during a predetermined period that is equal to or longer than two switching periods of the switch elements. A controller causes the resonant inverter circuit to stop a switching operation when the resonance frequency determiner determines that the resonance frequency of the resonant inverter circuit is abnormal.Type: ApplicationFiled: November 27, 2013Publication date: September 22, 2016Applicant: MITSUBISHI ELECTRIC CORPORATIONInventor: Ryotaro HARADA
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Publication number: 20150194903Abstract: A controller (2), when activating a power converter (1), outputs a gate signal to close a switch (SW1) for a set conduction time, and while the power converter (1) is active, outputs a gate signal to alternately close switches (SW1, SW2) for the conduction time. The controller (2), when stopping the power converter (1), outputs a gate signal to open the switches (SW1, SW2) after the switch (SW2) that was not closed upon the activation is closed for the conduction time without closing the switch (SW1) that was closed upon the activation.Type: ApplicationFiled: July 18, 2012Publication date: July 9, 2015Applicant: Mitsubishi Electric CorporationInventor: Ryotaro Harada
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Publication number: 20140346861Abstract: A vehicle auxiliary power supply device includes a resonant inverter circuit that converts DC input into a desired AC voltage and outputs the AC voltage and a control unit. The control unit includes a resonance-time managing unit managing resonance time of current flowing in the resonant inverter circuit, a gate-off-command generating unit detecting overcurrent flowing in the resonant inverter circuit based on detected current of a current detector, and, when the overcurrent is detected, generating, based on detected current of the current detector and resonance time managed by the resonance-time managing unit, a gate-off command to turn off switching elements included in the resonant inverter circuit after the elapse of time after which current flowing in the switching elements becomes zero for the first time, and a gate-signal generating unit generating a gate signal that controls the switching elements to be turned off when the gate-off command is input.Type: ApplicationFiled: November 28, 2011Publication date: November 27, 2014Applicant: Mitsubishi Electric CorporationInventors: Masato Achihara, Ryotaro Harada
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Publication number: 20140327302Abstract: An auxiliary power source device for a vehicle is incorporated in an electric vehicle and includes a three-phase inverter that converts an input DC voltage into a desired three-phase AC voltage and applies the three-phase AC voltage to a load. The auxiliary power source device further includes a filter reactor that is connected to respective output terminals of a three-phase inverter, a filter capacitor that is connected in a Y-shape at an end on a load side of the filter reactor and is not grounded at a neutral point, and a three-phase transformer that includes primary windings that are connected in a Y-shape at the end on the load side of the filter reactor and is grounded at a neutral point and secondary windings that are connected in a delta shape.Type: ApplicationFiled: November 24, 2011Publication date: November 6, 2014Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Ryotaro Harada, Takeshi Tanaka
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Patent number: 8599554Abstract: A power converter is installed in a casing attached beneath the floor of an electric vehicle. The power converter includes a capacitor unit and a power semiconductor module housed in a hermetically sealed part of the casing closed by a cover for closing an access port, and a cooler installed in an exposed part, the cooler cooling heat generated from the power semiconductor module. The power converter includes a bus bar that electrically connects the power semiconductor module and the capacitor unit, and a conductive bar that electrically connects the capacitor unit and the bus bar. The conductive bar is drawn from the upper surface of the capacitor unit, and is bent into a crank.Type: GrantFiled: July 6, 2009Date of Patent: December 3, 2013Assignee: Mitsubishi Electric CorporationInventors: Ryotaro Harada, Tetsuya Takahashi
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Publication number: 20120044640Abstract: A power converter is installed in a casing attached beneath the floor of an electric vehicle. The power converter includes a capacitor unit and a power semiconductor module housed in a hermetically sealed part of the casing closed by a cover for closing an access port, and a cooler installed in an exposed part, the cooler cooling heat generated from the power semiconductor module. The power converter includes a bus bar that electrically connects the power semiconductor module and the capacitor unit, and a conductive bar that electrically connects the capacitor unit and the bus bar. The conductive bar is drawn from the upper surface of the capacitor unit, and is bent into a crank.Type: ApplicationFiled: July 6, 2009Publication date: February 23, 2012Applicant: Mitsubishi Electric CorporationInventors: Ryotaro Harada, Tetsuya Takahashi
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Patent number: 8010271Abstract: A brake control device for an electric vehicle includes an instruction controller, a pattern generator, and comparators. The instruction controller generates an instruction signal for instructing a motor about electric brake force. The pattern generator generates a first pattern signal for changing over electric brake force to machine brake force and a second pattern signal obtained by shifting the first pattern signal by a predetermined frequency. One of the comparators outputs, as an electric-brake force pattern, smaller one of the instruction signal and the first pattern signal. The other of the comparators outputs, as a notification signal, a signal output when the second pattern signal becomes equal to or smaller than the instruction signal.Type: GrantFiled: May 30, 2007Date of Patent: August 30, 2011Assignee: Mitsubishi Electric CorporationInventor: Ryotaro Harada
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Publication number: 20100049416Abstract: A brake control device for an electric vehicle includes an instruction controller, a pattern generator, and comparators. The instruction controller generates an instruction signal for instructing a motor about electric brake force. The pattern generator generates a first pattern signal for changing over electric brake force to machine brake force and a second pattern signal obtained by shifting the first pattern signal by a predetermined frequency. One of the comparators outputs an electric-brake force pattern, which is the smaller one of the instruction signal and the first pattern signal. The other of the comparators outputs a notification signal when the second pattern signal becomes equal to or smaller than the instruction signal.Type: ApplicationFiled: May 30, 2007Publication date: February 25, 2010Inventor: Ryotaro Harada