Patents by Inventor Kotaro Oka

Kotaro Oka 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).

  • Patent number: 11846472
    Abstract: A heat exchanger includes flat tubes, a header to which the flat tubes are connected, an inflow plate that separates a refrigerant inflow portion and a lower circulation portion, a vertical dividing plate that separates the lower circulation portion and an upper circulation portion, a lower dividing plate that divides the lower circulation portion into a lower ascent path on an internal side and a lower descent path of an external side, and an upper dividing plate that divides the upper circulation portion into an upper ascent path on a leeward side, and an upper descent path on a windward side, wherein the inflow plate includes an ejection hole on a leeward side and an internal side, and the vertical dividing plate includes a first passing port on a leeward side and an internal side, and a second passing port on a windward external side.
    Type: Grant
    Filed: January 31, 2020
    Date of Patent: December 19, 2023
    Assignee: FUJITSU GENERAL LIMITED
    Inventors: Masatoshi Watanabe, Yoshinari Maema, Ryo Takaoka, Kotaro Oka
  • Patent number: 11828544
    Abstract: A heat exchanger includes: a plurality of flat tubes that are stacked in a direction perpendicular to a refrigerant flow direction, and a plurality of fins that have a first flat tube insertion portion into which a first flat tube among the plurality of flat tubes is inserted, and a second flat tube insertion portion into which a second flat tube adjacent to the first flat tube is inserted. A first fin has, formed on the inner periphery of the first flat tube insertion portion, a cut and raised piece for spacing a fin pitch between the first fin and an adjacent second fin. The cut and raised piece has a raised portion of the same length as the fin pitch, and a folded portion that is folded back at the tip of the raised portion and that is in contact with the second fin.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: November 28, 2023
    Assignee: FUJITSU GENERAL LIMITED
    Inventors: Daiki Shimano, Ryo Takaoka, Masatoshi Watanabe, Yoshinari Maema, Shohei Nakata, Kotaro Oka
  • Publication number: 20230133342
    Abstract: A heat exchanger includes a plurality of flat heat transfer tubes and a header, wherein the header includes an inflow plate that divides an interior portion of the header into an inflow portion and a circulation portion located on an upper side of the inflow portion, a first partition member that divides the circulation portion into ascending path to which the flat heat transfer tubes are connected and a descending path, that forms an upper communication path that communicates the ascending path and the descending path on an upper side of the circulation portion, and a lower communication path that communicates the ascending path and the descending path on a lower side of the circulation portion, and the inflow plate includes a first ejection hole that ejects, on the ascending path side and a downwind side, a refrigerant from the inflow portion to the ascending path.
    Type: Application
    Filed: March 1, 2021
    Publication date: May 4, 2023
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Kotaro OKA, Masatoshi WATANABE, Yoshinari MAEMA, Ryo TAKAOKA, Shohei NAKATA, Daiki SHIMANO
  • Publication number: 20230108901
    Abstract: A heat exchanger includes a plurality of flat heat transfer tubes and a header, wherein each of the flat heat transfer tubes internally includes a plurality of windward channels and a plurality of leeward channels that are arranged on a leeward side of the windward channels, the header includes a main body unit having an internal space that is connected to the windward channels and the leeward channels, a partition member that separates the internal space into a windward side space at a side of ends of the windward channels and a leeward side space at a side of ends of the leeward channels, and an inflow portion that supplies a refrigerant to the lower portion of the leeward side space, and an upper side communication path that allows communication between the leeward side space and the windward side space is formed in an upper portion of the partition member.
    Type: Application
    Filed: March 4, 2021
    Publication date: April 6, 2023
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Shohei NAKATA, Yoshinari MAEMA, Kotaro OKA
  • Publication number: 20230094694
    Abstract: A heat exchanger includes a plurality of flat heat transfer tubes and a header, wherein, in an interior portion of each of the plurality of flat heat transfer tubes, a plurality of upwind side channels and a plurality of downwind side channels are formed, the header includes a main body portion in which an interior portion space connected to the plurality of upwind side channels and the plurality of downwind side channels is formed, a partition member that divides the interior portion space into an upwind side space, and a flow inlet/outlet port that supplies a refrigerant to a lower part of the upwind side space, and, at a lower part of the partition member, a lower communication path that communicates the downwind side space and the upwind side space is formed.
    Type: Application
    Filed: March 4, 2021
    Publication date: March 30, 2023
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Shohei NAKATA, Yoshinari MAEMA, Kotaro OKA
  • Publication number: 20230085871
    Abstract: A heat exchanger (5) includes a plurality of flat heat transfer tubes (11) and a header (12), wherein the header (12) includes a first partition member (21) that separates an internal space of a main body unit (20) into a refrigerant inflow portion (24) and an upper portion (25), a second partition member (22) that separates the upper portion (25) into a connected portion (26) connected to the plurality of flat heat transfer tubes (11) and an opposite portion (27), and a third partition member (23) that separates the opposite portion (27) into a windward portion (28) and a leeward portion (29) a plurality of windward communication holes (35) and a plurality of leeward communication holes (36) that allow communication from the windward portion (28) and the leeward portion (29) to the connected portion (26) are arranged the second partition member (22) an adjustment channel (30) that distributes the refrigerant from the refrigerant inflow portion (24) to the windward portion (28) and the leeward portion (29) an
    Type: Application
    Filed: March 5, 2021
    Publication date: March 23, 2023
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Shohei NAKATA, Yoshinari MAEMA, Kotaro OKA
  • Publication number: 20230024558
    Abstract: A heat exchanger includes an inlet header in which a first inlet space and a second inlet space are formed, a plurality of first inlet-side heat exchanger tubes that are connected to the first inlet space, a plurality of second inlet-side heat exchanger tubes that are connected to the second inlet space, a return header in which a plurality of first return spaces connected to the first inlet-side heat exchanger tubes, respectively, and a plurality of second return spaces connected to the second inlet-side heat exchanger tubes, respectively, are formed, and a plurality of outlet-side heat exchanger tubes that are connected to the first and second return spaces, respectively, wherein a communication path that enables a first return space on a bottom side among the first return spaces and a second return space on a top side among the second return spaces to communicate is formed in the return header.
    Type: Application
    Filed: September 30, 2020
    Publication date: January 26, 2023
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Shohei NAKATA, Masatoshi WATANABE, Yoshinari MAEMA, Daiki SHIMANO, Kotaro OKA
  • Publication number: 20220243990
    Abstract: A heat exchanger includes a first-row heat exchange module through which a refrigerant is introduced from the outside, a second-row heat exchange module through which the refrigerant is discharged to the outside, a third-row heat exchange module through which the refrigerant is discharged to the outside, and a flow-splitting module that splits the refrigerant from the first-row heat exchange module into the second-row heat exchange module and the third-row heat exchange module, wherein the refrigerant reciprocates one time in a flow path, the first-row heat exchange module constitutes a forward path of the flow path, and both the second-row heat exchange module and the third-row heat exchange module constitute backward paths of the flow path.
    Type: Application
    Filed: January 29, 2020
    Publication date: August 4, 2022
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Shohei NAKATA, Masatoshi WATANABE, Yoshinari MAEMA, Ryo TAKAOKA, Daiki SHIMANO, Kotaro OKA
  • Publication number: 20220196335
    Abstract: A heat exchanger includes flat tubes, a header to which the flat tubes are connected, an inflow plate that separates a refrigerant inflow portion and a lower circulation portion, a vertical dividing plate that separates the lower circulation portion and an upper circulation portion, a lower dividing plate that divides the lower circulation portion into a lower ascent path on an internal side and a lower descent path of an external side, and an upper dividing plate that divides the upper circulation portion into an upper ascent path on a leeward side, and an upper descent path on a windward side, wherein the inflow plate includes an ejection hole on a leeward side and an internal side, and the vertical dividing plate includes a first passing port on a leeward side and an internal side, and a second passing port on a windward external side.
    Type: Application
    Filed: January 31, 2020
    Publication date: June 23, 2022
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Masatoshi WATANABE, Yoshinari MAEMA, Ryo TAKAOKA, Kotaro OKA
  • Publication number: 20220155029
    Abstract: A heat exchanger includes: a plurality of flat tubes; a fin in which a plurality of notches are arranged side by side in a vertical direction, the fin having a plurality of intermediate portions and a connecting portion connecting the intermediate portions to each other; and a first bulging portion having an upper end edge and a lower end edge provided between a first notch and a second notch, the upper end edge being positioned in the intermediate portion and the lower end edge being positioned in the connecting portion. The upper end edge has a first upper end positioned on an intermediate portion side, and a second upper end positioned on a connecting portion side, the first upper end being positioned to be higher than the second upper end, or the first upper end being positioned at the same height as the second upper end.
    Type: Application
    Filed: March 25, 2020
    Publication date: May 19, 2022
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Daiki SHIMANO, Masatoshi WATANABE, Yoshinari MAEMA, Ryo TAKAOKA, Shohei NAKATA, Kotaro OKA
  • Publication number: 20220128319
    Abstract: A heat exchanger (5) comprises: a plurality of flat tubes that are stacked in a direction perpendicular to a refrigerant flow direction, and a plurality of fins (111) that have a first flat tube among the plurality of flat tubes, a second flat tube adjacent to the first flat tube, a first flat tube insertion portion (113A) into which the first flat tube is inserted, and a second flat tube insertion portion (113B) into which the second flat tube is inserted. A first fin (111) has, formed on the inner periphery of the first flat tube insertion portion (113A), a cut and raised piece (114) for spacing a fin pitch (P) between the first fin (111) and an adjacent second fin (111). The cut and raised piece (114) has a raised portion of the same length as the fin pitch (P), and a folded portion that is folded back at the tip of the raised portion and that is in contact with the second fin (111).
    Type: Application
    Filed: March 25, 2020
    Publication date: April 28, 2022
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Daiki SHIMANO, Ryo TAKAOKA, Masatoshi WATANABE, Yoshinari MAEMA, Shohei NAKATA, Kotaro OKA
  • Publication number: 20220120451
    Abstract: An air conditioner includes a heat exchanger that is arranged in a ventilation flue inside a housing, wherein the heat exchanger includes a plurality of flat tubes, and a fin that includes a plurality of notch portions arranged side by side in a vertical direction, to which the plurality of flat tubes are inserted, and includes intermediate regions each formed between two of the notch portions adjacent to each other in a vertical direction, and a connection region connecting the intermediate regions to each other, first bulging portions that are at least partly positioned on the intermediate regions, and a second bulging portion that overlaps with a gap generated between the first bulging portions and the flat tubes.
    Type: Application
    Filed: January 31, 2020
    Publication date: April 21, 2022
    Applicant: FUJITSU GENERAL LIMITED
    Inventors: Daiki SHIMANO, Masatoshi WATANABE, Yoshinari MAEMA, Ryo TAKAOKA, Shohei NAKATA, Kotaro OKA
  • Patent number: 10751925
    Abstract: An extrusion die includes a die and a core, and the core includes a movable core portion that is movable along an extrusion direction and a fixed core portion. The movable core portion has non-similar cross-sectional shapes at front and rear two positions along the extrusion direction. A first portion of the elongated weather strip is molded in a state where the movable core portion is disposed at an advance position, and a second portion of the elongated weather strip is molded in a state where the movable core portion is disposed at a retreat position. During the molding of the second portion, a supply amount per unit time of a material for the sealing portion to a molding space for the hollow sealing portion that is secured between the core and the die is set to be larger than that during the molding of the first portion.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: August 25, 2020
    Assignee: TOKAI KOGYO CO., LTD.
    Inventors: Keiji Hiroe, Kotaro Oka
  • Patent number: 10611225
    Abstract: The weather strip configured to be attached to the automobile body opening portion is an elongated member having a length configured to correspond to a side portion and a corner portion of the automobile body opening portion and includes a hollow sealing portion. A surface of the sealing portion corresponding to a floor-side side portion and a surface of the sealing portion corresponding to a floor-side corner portion are continuous to each other. A wall thickness of the sealing portion corresponding to the floor-side side portion is set to be smaller than a wall thickness of the sealing portion corresponding to the floor-side corner portion. The sealing portion corresponding to the floor-side side portion includes a portion having a smallest wall thickness among the entire sealing portion.
    Type: Grant
    Filed: September 1, 2016
    Date of Patent: April 7, 2020
    Assignee: TOKAI KOGYO CO., LTD.
    Inventors: Keiji Hiroe, Akito Ueda, Kotaro Oka
  • Publication number: 20190084209
    Abstract: An extrusion die includes a die and a core, and the core includes a movable core portion that is movable along an extrusion direction and a fixed core portion. The movable core portion has non-similar cross-sectional shapes at front and rear two positions along the extrusion direction. A first portion of the elongated weather strip is molded in a state where the movable core portion is disposed at an advance position, and a second portion of the elongated weather strip is molded in a state where the movable core portion is disposed at a retreat position. During the molding of the second portion, a supply amount per unit time of a material for the sealing portion to a molding space for the hollow sealing portion that is secured between the core and the die is set to be larger than that during the molding of the first portion.
    Type: Application
    Filed: September 1, 2016
    Publication date: March 21, 2019
    Applicant: TOKAI KOGYO CO., LTD.
    Inventors: Keiji HIROE, Kotaro OKA
  • Publication number: 20180370343
    Abstract: The weather strip configured to be attached to the automobile body opening portion is an elongated member having a length configured to correspond to a side portion and a corner portion of the automobile body opening portion and includes a hollow sealing portion. A surface of the sealing portion corresponding to a floor-side side portion and a surface of the sealing portion corresponding to a floor-side corner portion are continuous to each other. A wall thickness of the sealing portion corresponding to the floor-side side portion is set to be smaller than a wall thickness of the sealing portion corresponding to the floor-side corner portion. The sealing portion corresponding to the floor-side side portion includes a portion having a smallest wall thickness among the entire sealing portion.
    Type: Application
    Filed: September 1, 2016
    Publication date: December 27, 2018
    Applicant: TOKAI KOGYO CO., LTD.
    Inventors: Keiji HIROE, Akito UEDA, Kotaro OKA
  • Patent number: 7109043
    Abstract: A fluorescent probe for measuring magnesium ion, which can selectively form a complex with magnesium ion in aqueous system is disclosed. The fluorescent probe for measuring magnesium ion according to the present invention has the structure represented by the following Formula [I]: (wherein R1 represents a hydrogen atom, metal atom or an ester-forming group; A represents a group which forms a ring structure together with carbon atom 1 and carbon atom 2; and X is a fluorescent group which may form a condensed ring together with the ring containing the group A).
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: September 19, 2006
    Assignees: Japan Science and Technology Corporation, The Kanagawa Academy of Science and Technology Foundation, Keio University
    Inventors: Koji Suzuki, Yoshio Suzuki, Kotaro Oka
  • Publication number: 20040044228
    Abstract: A fluorescent probe for measuring magnesium ion, which can selectively form a complex with magnesium ion in aqueous system is disclosed.
    Type: Application
    Filed: July 18, 2003
    Publication date: March 4, 2004
    Inventors: Koji Suzuki, Yoshio Suzuki, Kotaro Oka
  • Patent number: 5362325
    Abstract: A material processing apparatus includes a plurality of syringes provided detachable on a base member and containing fluids that are used for processing a material; A processing chamber is provided detachable on the base member for causing the material processing: An actuation mechanism actuates the plurality of syringes to supply the fluids in the syringes to the processing chamber; An interconnection fixture connects the plurality of syringes to the processing chamber for transporting the fluids in the plurality of syringes to the processing chamber. The plurality of syringes are provided detachable with respect to the interconnection fixture, and the processing chamber is provided detachable with respect to the interconnection fixture.
    Type: Grant
    Filed: December 23, 1993
    Date of Patent: November 8, 1994
    Assignee: Fujitsu Limited
    Inventors: Atsushi Shiraishi, Koji Asano, Makoto Gotoh, Kotaro Oka
  • Patent number: 5214288
    Abstract: A method of making a two-dimensional measurement of the concentration of a biological macromolecule aqueous solution and an apparatus for carrying out this method are disclosed. By charging the biological macromolecule aqueous solution and an aqueous crystallizing agent solution into a crystallizing cell, irradiating the crystallizing cell with an ultraviolet light from an ultraviolet light source, two-dimensionally scanning the ultraviolet light transmitted through the crystallizing cell by a linear image sensor to detect the quantity of the transmitted light, and carrying out a conversion of the detected quantity of the transmitted light to the protein concentration, the process of a crystallization of the biological macromolecule from biological macromolecule aqueous solution can be easily and accurately twodimensionally measured.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: May 25, 1993
    Assignee: Fujitsu Limited
    Inventors: Kotaro Oka, Koji Asano, Shozo Fujita