Patents by Inventor Mina Ogawa

Mina Ogawa 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: 20220233605
    Abstract: Provided herein are methods of making and using a number of different types of liver cells.
    Type: Application
    Filed: June 3, 2020
    Publication date: July 28, 2022
    Inventors: Shinichiro Ogawa, Mina Ogawa, Gordon Keller
  • Patent number: 11323059
    Abstract: A power conversion device comprising: a three-phase conversion circuit in which each of upper arm elements which are switching elements in an upper arm and each of lower arm elements which are switching elements in a lower arm are provided for each of three phases; and a switching control unit which alternately switches between an upper arm period of holding one of the upper arm elements ON and a lower arm period of holding one of the lower arm elements ON, wherein the switching control unit switches between the upper arm period and the lower arm period, based on an integrated value of power which is calculated by integrating a power pattern which is set beforehand.
    Type: Grant
    Filed: May 29, 2020
    Date of Patent: May 3, 2022
    Assignee: FUJIFILM HEALTHCARE CORPORATION
    Inventors: Yuki Kawaguchi, Syoutarou Shindou, Takayuki Masaki, Mina Ogawa
  • Publication number: 20210184617
    Abstract: For reducing a difference in heat generation between multiple switching elements even when power that is supplied to a load varies greatly or power is supplied in a non-periodic manner, there is disclosed a power conversion device including a three-phase conversion circuit in which each of upper arm elements which are switching elements in an upper arm and each of lower arm elements which are switching elements in a lower arm are provided for each of three phases, and a switching control unit which alternately switches between an upper arm period of holding one of the upper arm elements ON and a lower arm period of holding one of the lower arm elements ON. The switching control unit switches between the upper arm period and the lower arm period, based on an integrated value of power which is calculated by integrating a power pattern which is set beforehand.
    Type: Application
    Filed: May 29, 2020
    Publication date: June 17, 2021
    Applicant: Hitachi, Ltd.
    Inventors: Yuki Kawaguchi, Syoutarou Shindou, Takayuki Masaki, Mina Ogawa
  • Publication number: 20200157494
    Abstract: Methods for producing hepatocyte and/or cholangiocyte lineage cells from pluripotent stem cells, the method comprising (a) specifying the extended nodal agonist treated induced endodermal cell population to obtain a cell population comprising hepatocyte and/or cholangiocyte progenitors by contacting the extended nodal agonist treated induced endodermal cell population with specification media comprising a FGF agonist and a BMP4 agonist and/or active conjugates and/or fragments thereof; (b) inducing maturation, and optionally further lineage specification and/or expansion of the hepatocyte and/or cholangiocyte progenitors of the cell population to obtain a population comprising hepatocyte lineage cells such as hepatoblasts, hepatocytes and/or cholangiocytes, the inducing maturation step comprising generating aggregates of the cell population. Optionally, the method also comprises activating the cAMP pathway within the aggregates and forming co-aggregates.
    Type: Application
    Filed: August 22, 2018
    Publication date: May 21, 2020
    Applicants: UNIVERSITY HEALTH NETWORK, THE HOSPITAL FOR SICK CHILDREN
    Inventors: Gordon KELLER, Shinichiro OGAWA, Anand GHANEKAR, Christine BEAR, Binita M. KAMATH, Mina OGAWA, James SURAPISITCHAT
  • Publication number: 20200137862
    Abstract: A highly efficient high voltage generating device comprises a switching circuit 2 comprising plural switching elements S1˜S4 and connected with a direct current power source circuit 1, a rectifying circuit 4, a primary winding N1 connected with the switching circuit 2, a secondary winding N2 connected with the rectifying circuit 4 and a control circuit 5 to control the switching circuit 2. The control device 5 is configured to perform a current circulation function of passing a current to circulate between the switching circuit 2 and the transformer 3 to reverse polarity of a voltage VCp2 over the secondary winding N2, while keeping on at least one of the switching elements S1˜S4.
    Type: Application
    Filed: October 11, 2019
    Publication date: April 30, 2020
    Applicant: HITACHI, LTD.
    Inventors: Yuki KAWAGUCHI, Shotaro SHINDO, Satoru HATSUMI, Mina OGAWA
  • Publication number: 20160286636
    Abstract: In order to provide a high-voltage generator having a high-voltage transformer miniaturized while insulation between secondary windings and an iron core is maintained, the present invention is characterized by that the high-voltage transformer having a primary winding, the secondary windings, and the iron core as well as a high-voltage rectifier rectifying an alternating current voltage to be output from the high-voltage transformer into a direct current voltage are comprised, that the secondary windings and the iron core are divided in the direction of a magnetic flux generated by applying an alternating current to the primary winding, that the respective divided secondary windings are wound around the respective divided iron cores correspondingly, and that dielectrics are disposed between the respective divided iron cores.
    Type: Application
    Filed: November 13, 2014
    Publication date: September 29, 2016
    Applicant: HITACHI, LTD.
    Inventors: Mina OGAWA, Hiroshi TAKANO
  • Publication number: 20160002595
    Abstract: Methods for producing hepatocyte and/or cholangiocyte lineage cells from pluripotent stem cells, the method comprising (a) specifying the extended nodal agonist treated induced endodermal cell population to obtain a cell population comprising hepatocyte and/or cholangiocyte progenitors by contacting the extended nodal agonist treated induced endodermal cell population with specification media comprising a FGF agonist and a BMP4 agonist and/or active conjugates and/or fragments thereof; (b) inducing maturation, and optionally further lineage specification and/or expansion of the hepatocyte and/or cholangiocyte progenitors of the cell population to obtain a population comprising hepatocyte lineage cells such as hepatoblasts, hepatocytes and/or cholangiocytes, the inducing maturation step comprising generating aggregates of the cell population. Optionally, the method also comprises activating the cAMP pathway within the aggregates and forming co-aggregates.
    Type: Application
    Filed: February 18, 2014
    Publication date: January 7, 2016
    Inventors: Gordon KELLER, Shinichiro OGAWA, Anand GHANEKAR, Christine BEAR, Binita M. KAMATH, Mina OGAWA, James SURAPISITCHAT
  • Patent number: 8588371
    Abstract: An inverter circuit allowing a single drive circuit to perform both tracking control for tracking resonance frequency fluctuations caused by load fluctuations, and power control, thereby reducing switching loss. An inverter drive circuit part obtains a phase difference between output current and output voltage directed to a load circuit connected to a midpoint of two arm circuits of the inverter circuit, and controls a phase of the driving signal directed to each semiconductor switch such that the phase difference becomes zero or a predetermined value, enabling an operating frequency of the inverter circuit part to track a resonance frequency of the load circuit, and enabling a current phase to be delayed with respect to a voltage phase, thereby achieving ZCS. Since the phase difference is used, an auxiliary circuit is not necessary for measuring a current value in proximity to the semiconductor switches.
    Type: Grant
    Filed: November 5, 2009
    Date of Patent: November 19, 2013
    Assignees: Hitachi Medical Corporation, Institute of National College of Technology, National University Cooperation Nagaoka University of Technology
    Inventors: Mina Ogawa, Itaru Ando, Kiyoshi Ohishi, Shoutaro Shindo
  • Publication number: 20110222651
    Abstract: There is provided an inverter circuit which allows a single drive circuit to carry out both the tracking control for tracking resonance frequency fluctuations caused by load fluctuations, and the power control, thereby reducing switching loss. An inverter drive circuit part obtains a phase difference between output current and output voltage directed to a load circuit which is connected to a midpoint of two arm circuits of the inverter circuit, and controls a phase of the driving signal directed to each of the semiconductor switches in such a manner that the phase difference becomes zero or a predetermined value. This allows an operating frequency of the inverter circuit part to track a resonance frequency of the load circuit. In addition, this enables a current phase to be delayed with respect to a voltage phase, thereby achieving ZCS.
    Type: Application
    Filed: November 5, 2009
    Publication date: September 15, 2011
    Applicants: HITACHI MEDICAL CORPORATION, Institute of National Colleges of Technology, Japan, National University Corporation Nagaoka University of Technology
    Inventors: Mina Ogawa, Itaru Ando, Kiyoshi Ohishi, Shoutaro Shindo