Patents by Inventor Akito Tanaka

Akito Tanaka 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).

  • Publication number: 20240128887
    Abstract: A first voltage control circuitry controls a first representative value, i.e., an average-value corresponding value of DC capacitor voltages of all converter cells to follow an overall voltage command value. A phase balance control circuitry controls second representative values, i.e., average-value corresponding values of DC capacitor voltages of the converter cells in leg circuits for respective phases to follow the first representative value. A positive-negative balance control circuitry controls deviations of third representative values, i.e., average-value corresponding values of the DC capacitor voltages of the converter cells in the positive and negative arms of the leg circuits for respective phases to become zero between the positive and negative arms. An individual balance control circuitry controls DC capacitor voltages of all the converter cells to follow the third representative values.
    Type: Application
    Filed: April 5, 2021
    Publication date: April 18, 2024
    Applicant: Mitsubishi Electric Corporation
    Inventors: Miwako TANAKA, Toshiyuki FUJII, Takuya KAJIYAMA, Akito NAKAYAMA
  • Patent number: 11070142
    Abstract: A power conversion device includes a single-phase full-wave rectifying unit, an electrolytic capacitor, a plurality of chopper circuits that are arranged between the single-phase full-wave rectifying unit and the electrolytic capacitor, each of the chopper circuits including a reactor, a first MOSFET connected in parallel with the single-phase full-wave rectifying unit, and a second MOSFET connected to a positive terminal of the electrolytic capacitor at one end and to the reactor and the first MOSFET at the other end, a first current detecting unit to bidirectionally detect a current flowing through the reactor, and a control unit to control an operation of the first MOSFET by using the detection result from the first current detecting unit.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: July 20, 2021
    Assignee: Mitsubishi Electric Corporation
    Inventors: Satoru Ichiki, Akito Tanaka, Shunsuke Kubota
  • Publication number: 20200403526
    Abstract: A power conversion device includes a single-phase full-wave rectifying unit, an electrolytic capacitor, a plurality of chopper circuits that are arranged between the single-phase full-wave rectifying unit and the electrolytic capacitor, each of the chopper circuits including a reactor, a first MOSFET connected in parallel with the single-phase full-wave rectifying unit, and a second MOSFET connected to a positive terminal of the electrolytic capacitor at one end and to the reactor and the first MOSFET at the other end, a first current detecting unit to bidirectionally detect a current flowing through the reactor, and a control unit to control an operation of the first MOSFET by using the detection result from the first current detecting unit.
    Type: Application
    Filed: November 15, 2017
    Publication date: December 24, 2020
    Inventors: Satoru ICHIKI, Akito TANAKA, Shunsuke KUBOTA
  • Patent number: 10734900
    Abstract: A converter device includes a rectifier circuit to rectify an AC voltage output from an AC power supply, a booster circuit including a plurality of reactors, a plurality of switching elements, and a plurality of backflow prevention elements to boost an output voltage of the rectifier circuit, a smoothing capacitor to smooth an output voltage of the booster circuit, a bus-current detection circuit to detect a value of a current that flows between the rectifier circuit and the booster circuit, a first filter circuit having a first filter time constant, a second filter circuit having a second filter time constant shorter than the first filter time constant, and a control unit to control an operation of the switching elements as a current value detected by the bus-current detection circuit is input to the control unit via the first filter circuit and the second filter circuit.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: August 4, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akito Tanaka, Satoru Ichiki, Tomohiro Kutsuki, Daisuke Suzuki, Akira Sakai
  • Patent number: 10693377
    Abstract: The converter device includes a rectification circuit that receives, as an input, AC power from an AC power supply, and performs full-wave rectification on the AC power received, a booster circuit that boosts an output voltage from the rectification circuit, a smoothing capacitor that smooths an output voltage from the booster circuit, and outputs a voltage smoothed, to the load, and a controller that controls the booster circuit. The booster circuit includes a plurality of booster sections each of which includes a reactor, a switching element, and a reverse-blocking diode. The controller maintains, in an ON state, the switching element included in at least one of the plurality of booster sections for a predetermined time period to determine the presence or absence of a fault of the booster section.
    Type: Grant
    Filed: February 24, 2016
    Date of Patent: June 23, 2020
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomohiro Kutsuki, Akira Sakai, Daisuke Suzuki, Satoru Ichiki, Akito Tanaka
  • Publication number: 20190312510
    Abstract: A converter device includes a rectifier circuit to rectify an AC voltage output from an AC power supply, a booster circuit including a plurality of reactors, a plurality of switching elements, and a plurality of backflow prevention elements to boost an output voltage of the rectifier circuit, a smoothing capacitor to smooth an output voltage of the booster circuit, a bus-current detection circuit to detect a value of a current that flows between the rectifier circuit and the booster circuit, a first filter circuit having a first filter time constant, a second filter circuit having a second filter time constant shorter than the first filter time constant, and a control unit to control an operation of the switching elements as a current value detected by the bus-current detection circuit is input to the control unit via the first filter circuit and the second filter circuit.
    Type: Application
    Filed: December 28, 2016
    Publication date: October 10, 2019
    Inventors: Akito TANAKA, Satoru ICHIKI, Tomohiro KUTSUKI, Daisuke SUZUKI, Akira SAKAI
  • Publication number: 20190173384
    Abstract: The converter device includes a rectification circuit that receives, as an input, AC power from an AC power supply, and performs full-wave rectification on the AC power received, a booster circuit that boosts an output voltage from the rectification circuit, a smoothing capacitor that smooths an output voltage from the booster circuit, and outputs a voltage smoothed, to the load, and a controller that controls the booster circuit. The booster circuit includes a plurality of booster sections each of which includes a reactor, a switching element, and a reverse-blocking diode. The controller maintains, in an ON state, the switching element included in at least one of the plurality of booster sections for a predetermined time period to determine the presence or absence of a fault of the booster section.
    Type: Application
    Filed: February 24, 2016
    Publication date: June 6, 2019
    Inventors: Tomohiro KUTSUKI, Akira SAKAI, Daisuke SUZUKI, Satoru ICHIKI, Akito TANAKA
  • Patent number: 10084383
    Abstract: A booster device includes a shunt resistor with one end thereof being connected to a common bus on a low potential side and a plurality of booster circuits that are connected to one another in parallel and are connected between the other end of the shunt resistor and an input bus on a high potential side. The booster device can suppress its cost and mounting area.
    Type: Grant
    Filed: March 27, 2015
    Date of Patent: September 25, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventor: Akito Tanaka
  • Patent number: 9987208
    Abstract: 8-[2-(2-Pentyl-cyclopropylmethyl)-cyclopropyl]-octanoic acid (DCP-LA) has an action to promote synthesis and regeneration of elastin, and is useful as an agent for the prophylaxis or improvement of wrinkles, and an anti-aging drug.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: June 5, 2018
    Assignee: Nishizaki Bioinformation Research Institute
    Inventors: Tomoyuki Nishizaki, Akito Tanaka
  • Publication number: 20170353109
    Abstract: A booster device includes a shunt resistor with one end thereof being connected to a common bus on a low potential side and a plurality of booster circuits that are connected to one another in parallel and are connected between the other end of the shunt resistor and an input bus on a high potential side. The booster device can suppress its cost and mounting area.
    Type: Application
    Filed: March 27, 2015
    Publication date: December 7, 2017
    Inventor: Akito TANAKA
  • Patent number: 9603821
    Abstract: 8-[2-(2-pentyl-cyclopropylmethyl)-cyclopropyl]-octanoic acid has a protein tyrosine phosphatase 1B (PTP1B) inhibitory action, an Akt activating action, a GSK-3? phosphorylation promoting action, and a suppressive action on ? protein phosphorylation induced by A?1-42, and is useful as a therapeutic drug for Alzheimer-type dementia, an antidepressant and/or an anti-aging drug.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: March 28, 2017
    Assignee: Nishizaki Bioinformation Research Institute
    Inventors: Tomoyuki Nishizaki, Akito Tanaka
  • Patent number: 9512152
    Abstract: The invention provides a phospholipid compound containing unsaturated fatty acid having a cyclopropane ring such as 8-[2-(2-pentyl-cyclopropylmethyl)-cyclopropyl]-octanoic acid (DCP-LA) and 8-(2-octylcyclopropyl)octanoic acid (DCP-OA) and the like, particularly 1,2-o-bis-[8-{2-(2-pentyl-cyclopropylmethyl)-cyclopropyl}-octanoyl]-sn-glycero-3-phosphatidylethanolamine (diDCP-LA-PE), which has a cognitive function improving effect and an anti-diabetes action, and which is useful as a medicine such as a therapeutic drug for dementia, a therapeutic drug for diabetes and the like.
    Type: Grant
    Filed: February 14, 2014
    Date of Patent: December 6, 2016
    Assignee: Nishizaki Bioinformation Research Institute
    Inventors: Tomoyuki Nishizaki, Akito Tanaka
  • Publication number: 20160120888
    Abstract: An anti-cancer agent and a cancer cell death inducing agent, containing an inositol phospholipid compound, particularly 1,2-O-bis-[8-{2-(2-pentyl-cyclopropylmethyl)-cyclopropyl}-octanoyl]-sn-glycerol-3-phosphatidyl-inositol, as an active ingredient.
    Type: Application
    Filed: June 6, 2014
    Publication date: May 5, 2016
    Inventors: Tomoyuki NISHIZAKI, Takashi NAKANO, Akito TANAKA, Tadashi SHIMIZU, Takeshi KANNO
  • Publication number: 20160089352
    Abstract: Provided is a cellular membrane trafficking promoter for a 5-HT1A serotonin receptor and the like. A cellular membrane trafficking promoter for a 5-HT1A serotonin receptor containing 8-[2-(2-pentyl-cyclopropylmethyl)-cyclopropyl]-octanoic acid as an active ingredient, and the like.
    Type: Application
    Filed: May 15, 2014
    Publication date: March 31, 2016
    Inventors: Tomoyuki Nishizaki, Akito Tanaka
  • Patent number: 9272980
    Abstract: The present invention aims to provide a compound having an anticancer action comparable or superior to that of naftopidil. A compound represented by the formula (I) wherein each symbol is as defined in the SPECIFICATION, or a pharmaceutically acceptable salt thereof, particularly 1-((2-((2-methoxyphenyl)amino)ethyl)amino)-3-(1-naphthyloxy)propan-2-ol, or a pharmaceutically acceptable salt thereof. The compound shows a cell proliferation suppressive action on a wide range of cancer cells, is useful as an anti-cancer agent, and is useful for the prophylaxis and/or treatment of cancer.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: March 1, 2016
    Assignee: KTN BioTec, Inc.
    Inventors: Takeshi Kanno, Akito Tanaka, Tadashi Shimizu, Takashi Nakano, Tomoyuki Nishizaki
  • Publication number: 20160045415
    Abstract: 8-[2-(2-Pentyl-cyclopropylmethyl)-cyclopropyl]-octanoic acid (DCP-LA) has an action to promote synthesis and regeneration of elastin, and is useful as an agent for the prophylaxis or improvement of wrinkles, and an anti-aging drug.
    Type: Application
    Filed: April 4, 2014
    Publication date: February 18, 2016
    Inventors: Tomoyuki NISHIZAKI, Akito TANAKA
  • Publication number: 20160008308
    Abstract: 8-[2-(2-pentyl-cyclopropylmethyl)-cyclopropyl]-octanoic acid has a protein tyrosine phosphatase 1B (PTP1B) inhibitory action, an Akt activating action, a GSK-3? phosphorylation promoting action, and a suppressive action on ? protein phosphorylation induced by A?1-42, and is useful as a therapeutic drug for Alzheimer-type dementia, an antidepressant and/or an anti-aging drug.
    Type: Application
    Filed: February 21, 2014
    Publication date: January 14, 2016
    Applicant: NISHIZAKI BIOINFORMATION RESEARCH INSTITUTE
    Inventors: Tomoyuki NISHIZAKI, Akito TANAKA
  • Publication number: 20150376213
    Abstract: The invention provides a phospholipid compound containing unsaturated fatty acid having a cyclopropane ring such as 8-[2-(2-pentyl-cyclopropylmethyl)-cyclopropyl]-octanoic acid (DCP-LA) and 8-(2-octylcyclopropyl)octanoic acid (DCP-OA) and the like, particularly 1,2-o-bis-[8-{2-(2-pentyl-cyclopropylmethyl)-cyclopropyl}-octanoyl]-sn-glycero-3-phosphatidylethanolamine (diDCP-LA-PE), which has a cognitive function improving effect and an anti-diabetes action, and which is useful as a medicine such as a therapeutic drug for dementia, a therapeutic drug for diabetes and the like.
    Type: Application
    Filed: February 14, 2014
    Publication date: December 31, 2015
    Inventors: Tomoyuki NISHIZAKI, Akito TANAKA
  • Patent number: 9212169
    Abstract: The present invention aims to provide a compound capable of inhibiting PCA-1 that can be a target for a novel treatment method of various diseases, and pharmaceutical use of the compound. A compound represented by the formula (I): wherein each symbol is as defined in the DESCRIPTION, or a pharmaceutically acceptable salt thereof.
    Type: Grant
    Filed: March 1, 2013
    Date of Patent: December 15, 2015
    Assignees: HYOGO COLLEGE OF MEDICINE, KAGOSHIMA UNIVERSITY, OSAKA UNIVERSITY
    Inventors: Kazutake Tsujikawa, Akito Tanaka, Shunji Aoki, Hiroaki Mizuno, Miyuki Tokoro, Tatsuhiko Furukawa
  • Publication number: 20150353473
    Abstract: The present invention aims to provide a compound having an anticancer action comparable or superior to that of naftopidil. A compound represented by the formula (I) wherein each symbol is as defined in the SPECIFICATION, or a pharmaceutically acceptable salt thereof, particularly 1-((2-((2-methoxyphenyl)amino)ethyl)amino)-3-(1-naphthyloxy)propan-2-ol, or a pharmaceutically acceptable salt thereof. The compound shows a cell proliferation suppressive action on a wide range of cancer cells, is useful as an anti-cancer agent, and is useful for the prophylaxis and/or treatment of cancer.
    Type: Application
    Filed: June 6, 2014
    Publication date: December 10, 2015
    Inventors: Takeshi KANNO, Akito TANAKA, Tadashi SHIMIZU, Takashi NAKANO, Tomoyuki NISHIZAKI