Patents by Inventor Keiji Takeda

Keiji Takeda 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: 11837915
    Abstract: The R-T-B-based magnet contains one or more kinds of rare earth elements (R), a transition metal element (T) including iron or iron and Co as an essential element, B, an element M that is Ga or Ga and Al, and C. When ratios of the number of atoms of R, T, B, M, and C are set as a, b, c, d, and e, respectively, relationships of 14%?a?20%, 70%?b?82%, 4%?c?7%, 0.009?d/b?0.035, and 0.025?e/b?0.055 are satisfied. The R-T-B-based magnet includes main phase crystal grains having an R2T14B-type tetragonal structure, and a grain boundary phase including an R-T-M-C phase. When ratios of R, T, M, and C in the main phase crystal grains are set as RMP, TMP, MMP, and CMP, and ratios of R, T, M, and C in the R-T-M-C phase are set as RRC, TRC, MRC, and CRC, relationships of RRC>RMP, TRC<TMP, MRC>MMP, and CRC>CMP are satisfied, and a relationship of 0.07?MRC/TRC?0.65 is satisfied.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: December 5, 2023
    Assignee: TDK CORPORATION
    Inventors: Tomohiro Kajita, Shota Miyazaki, Keiji Takeda
  • Patent number: 11798717
    Abstract: An R-T-B-based rare earth permanent magnet in which the composition formula is represented by (R11-x-ySmxR2y)aTbBcMd, wherein: R1 is one or more rare earth elements not including Sm and Y; R2 is one or more rare earth elements from among Y, Ce, and La; T is Fe, etc.; M is Ga, etc.; x and y are in the region indicated in FIG. 1; the relationships 0.16?a/b?0.28, 0.050?c/b?0.075, and 0.005?d/b?0.028 are satisfied; the R-T-B-based rare earth permanent magnet includes a grain boundary phase and a main phase comprising an R2T14B compound; the average crystal grain diameter of the main-phase crystal grains is D50?4.00 ?m; the granularity distribution is (D90?D10)/D50?1.60; and the coverage of the grain boundary phase is at least 70.0%.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: October 24, 2023
    Assignee: TDK CORPORATION
    Inventors: Keiji Takeda, Shota Miyazaki
  • Publication number: 20220018043
    Abstract: The present invention relates to a fiber structure including an elastic polyurethane yarn. The elastic polyurethane yarn contains: 0.5 to 10 mass % of a cationic high-molecular-weight compound A having a number-average molecular weight of 2000 or more; and an inorganic chlorine deterioration inhibitor B. The mass ratio of the cationic high-molecular-weight compound A to the inorganic chlorine deterioration inhibitor B ranges from 0.3 to 3, and a silicone oil is applied to the elastic polyurethane yarn. The fiber structure is treated with water repellent finishing. The fiber structure preferably includes an elastic polyurethane yarn whose ratio of fluorine (F) to carbon (C) on the elastic polyurethane yarn is 0.030 or more in an elemental mass concentration according to scanning electron microscope-energy dispersive X-ray spectroscopy (SEM-EDX). Thereby, it is possible to provide a fiber structure having high water repellency and keeping a low water retention rate when immersed in water for an extended time.
    Type: Application
    Filed: September 30, 2021
    Publication date: January 20, 2022
    Inventors: Chika KIMURA, Keiji TAKEDA, Keiko KASAHARA
  • Patent number: 11120931
    Abstract: An object of the present invention is to provide an R-T-B based permanent magnet having a low coercive force and a low magnetizing field, and having a high residual magnetic flux density and a high minor curve flatness even in the low magnetizing field. Provided is an R-T-B based permanent magnet including a main phase crystal grain including a compound having an R2T14B type tetragonal structure and a grain boundary phase existing between the main phase crystal grains, in which R is at least one rare earth element including scandium and yttrium, T is at least one transition metal element including iron, or at least two transition metal elements including iron and cobalt, an average diameter D50 of the main phase crystal grain is 1.00 ?m or less, and a content of carbon included in the R-T-B based permanent magnet is 3,000 ppm or more.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: September 14, 2021
    Assignee: TDK CORPORATION
    Inventors: Shota Miyazaki, Keiji Takeda
  • Publication number: 20210242727
    Abstract: The R-T-B-based magnet contains one or more kinds of rare earth elements (R), a transition metal element (T) including iron or iron and Co as an essential element, B, an element M that is Ga or Ga and Al, and C. When ratios of the number of atoms of R, T, B, M, and C are set as a, b, c, d, and e, respectively, relationships of 14%?a?20%, 70%?b?82%, 4%?c?7%, 0.009?d/b?0.035, and 0.025?e/b?0.055 are satisfied. The R-T-B-based magnet includes main phase crystal grains having an R2T14B-type tetragonal structure, and a grain boundary phase including an R-T-M-C phase. When ratios of R, T, M, and C in the main phase crystal grains are set as RMP, TMP, MMP, and CMP, and ratios of R, T, M, and C in the R-T-M-C phase are set as RRC, TRC, MRC, and CRC, relationships of RRC>RMP, TRC<TMP, MRC>MMP, and CRC>CMP are satisfied, and a relationship of 0.07?MRC/TRC?0.65 is satisfied.
    Type: Application
    Filed: May 17, 2019
    Publication date: August 5, 2021
    Applicant: TDK CORPORATION
    Inventors: Tomohiro KAJITA, Shota MIYAZAKI, Keiji TAKEDA
  • Patent number: 10966656
    Abstract: An electric conductive fiber structure includes an electric conductive resin containing electric conductive polymer(s), the electric conductive resin being filled in gaps between single fibers included in a fiber structure, the electric conductive fiber structure having 15% or more area ratio of the electric conductive resin present in an area of 15 to 30 ?m from a surface when a cross section in a thickness direction of the fiber structure is observed.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: April 6, 2021
    Assignees: Toray Industries, Inc., Nagase ChemteX Corporation
    Inventors: Noriko Nagai, Keiji Takeda, Jun Kawakami, Hiroshi Nagata, Tatsuya Ohori
  • Patent number: 10918334
    Abstract: A wearable electrode includes: a garment including an outer member and a backing member configured to cover at least a part of an inner surface of the outer member; and an electrode unit configured to come into contact with a living body clothed in the garment to acquire a biological signal emitted by the living body and attached to an opposite side of the backing member from the outer member. The outer member and the backing member are connected to each other in a part other than a part of the backing member, to which the electrode unit is attached.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: February 16, 2021
    Assignees: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, TORAY INDUSTRIES, INC.
    Inventors: Shingo Tsukada, Nahoko Kasai, Koji Sumitomo, Hiroshi Nakashima, Masanobu Sato, Toru Arakane, Yuri Hamano, Keiji Takeda, Noriko Nagai, Takashi Teshigawara
  • Publication number: 20210043343
    Abstract: An R-T-B-based rare earth permanent magnet in which the composition formula is represented by (R11-x-ySmXR2y)aTbBcMd, wherein: R1 is one or more rare earth elements not including Sm and Y; R2 is one or more rare earth elements from among Y, Ce, and La; T is Fe, etc.; M is Ga, etc.; x and y are in the region indicated in FIG. 1; the relationships 0.16?a/b?0.28, 0.050?c/b?0.075, and 0.005?d/b?0.028 are satisfied; the R-T-B-based rare earth permanent magnet includes a grain boundary phase and a main phase comprising an R2T14B compound; the average crystal grain diameter of the main-phase crystal grains is D50?4.00 ?m; the granularity distribution is (D90?D10)/D50?1.60; and the coverage of the grain boundary phase is at least 70.0%.
    Type: Application
    Filed: January 29, 2019
    Publication date: February 11, 2021
    Applicant: TDK CORPORATION
    Inventors: Keiji TAKEDA, Shota MIYAZAKI
  • Patent number: 10799136
    Abstract: A bioelectrode includes a fitting member (1106) formed by an electrically insulating member fixed on a surface of a garment (1100) that comes in contact with a living body (1000), an electrode part (1101a) formed by a conductive member fixed on a surface of the fitting member (1106) that comes in contact with the living body (1000), a connector (1102a) fixed to the fitting member (1106) and configured to connect a bioelectric signal measurement device, a wiring line (1103a) fixed to the fitting member (1106) and configured to electrically connect the connector (1102a) and the electrode part (1101a), and an electrically-insulating insulating member (1105) configured to cover a portion within the surface of the wiring line (1103a) that comes in contact with the living body (1000).
    Type: Grant
    Filed: December 7, 2015
    Date of Patent: October 13, 2020
    Assignees: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, TORAY INDUSTRIES, INC.
    Inventors: Kazuhiko Takagahara, Ryusuke Kawano, Takako Ishihara, Michiko Seyama, Ryoichi Kasahara, Yasuhiro Sato, Atsushi Horiuchi, Masanobu Sato, Emiko Ishikawa, Keiji Takeda, Noriko Nagai
  • Patent number: 10784029
    Abstract: An object of the present invention is to provide an R-T-B based permanent magnet having a low coercive force and a low magnetizing field, and having a high residual magnetic flux density and a high minor curve flatness even in the low magnetizing field. Provided is an R-T-B based permanent magnet including a main phase including a compound having an R2T14B type tetragonal structure and a grain boundary phase existing between the main phases, in which R is at least one rare earth element including scandium and yttrium, T is at least one transition metal element including iron, or at least two transition metal elements including iron and cobalt, the grain boundary includes an R-T-B—C based compound having a higher R concentration, B concentration and C concentration than that of the main phase and having a lower T concentration than that of the main phase.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: September 22, 2020
    Assignee: TDK CORPORATION
    Inventors: Keiji Takeda, Shota Miyazaki
  • Patent number: 10772524
    Abstract: A biomedical electrode which is detachably attached to a garment and includes: an electrode coming into contact with a living body clothed in the garment to acquire a biological signal emitted by the living body; and a locked section which is conductive, is electrically connected to the electrode, is detachably locked to a locking section which is conductive and is provided in the garment, and is electrically connected to the locking section when locked to the locking section.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: September 15, 2020
    Assignees: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, TORAY INDUSTRIES, INC.
    Inventors: Shingo Tsukada, Nahoko Kasai, Koji Sumitomo, Hiroshi Nakashima, Masanobu Sato, Toru Arakane, Yuri Hamano, Keiji Takeda, Noriko Nagai, Takashi Teshigawara
  • Publication number: 20200283949
    Abstract: Provided is a fiber structure having high adhesion suppressibility against aqueous soil and oily soil and soil removability in washing. A soil resistant fiber structure includes a resin film on at least a part of a fiber surface, the resin film containing polyvinyl alcohol and a fluorine-based oil-repellent resin having a hydrophilic component, the fiber structure having a water repellency degree of 2 or less as measured by a spray test in accordance with JIS L-1092, and an oil repellency degree of 2 or more as measured in accordance with AATCC 118 method. The fluorine-based oil-repellent resin is preferably a fluorine-based oil-repellent resin containing a polyoxyalkylene group. The polyvinyl alcohol preferably has an average polymerization degree of 200 to 1500.
    Type: Application
    Filed: October 4, 2018
    Publication date: September 10, 2020
    Applicant: Toray Industries, Inc.
    Inventors: Shota Takeshita, Keiji Takeda
  • Patent number: 10736530
    Abstract: A biomedical electrode which is detachably attached to a garment and includes: an electrode coming into contact with a living body clothed in the garment to acquire a biological signal emitted by the living body; and a locked section which is conductive, is electrically connected to the electrode, is detachably locked to a locking section which is conductive and is provided in the garment, and is electrically connected to the locking section when locked to the locking section.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: August 11, 2020
    Assignees: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, TORAY INDUSTRIES, INC.
    Inventors: Shingo Tsukada, Nahoko Kasai, Koji Sumitomo, Hiroshi Nakashima, Masanobu Sato, Toru Arakane, Yuri Hamano, Keiji Takeda, Noriko Nagai, Takashi Teshigawara
  • Patent number: 10614937
    Abstract: An R-T-B based rare earth permanent magnet is expressed by formula: (R11-x(Y1-y-z Cey Laz)x)aTbBcMd in which, R1 is one or more kinds of rare earth element not including Y, Ce and La, “T” is one or more kinds of transition metal, and includes Fe or Fe and Co as an essential component, “M” is an element having Ga or Ga and one or more of Sn, Bi and Si, 0.4?x?0.7, 0.00?y+z?0.20, 0.16?a/b?0.28, 0.050?c/b?0.070, 0.005?d/b?0.028, 0.25?(a-2c)/(b-14c)?2.00 and 0.025?d/(b-14c)?0.500. The magnet has a structure having a main phase, having a compound having a R2T14B type tetragonal structure, and a grain boundary phase, on an arbitrary cross sectional area, an area ratio of R-T-M, T-rich and R-rich phases, with respect to a total grain boundary phase area is 10.0% or more, 60.0% or less and 70.0% or less, respectively, and the coating rate of the grain boundary phase is 70.0% or more.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: April 7, 2020
    Assignee: TDK CORPORATION
    Inventors: Shota Miyazaki, Keiji Takeda
  • Patent number: 10566117
    Abstract: An R-T-B based rare earth permanent magnet is expressed by a compositional formula: (R11?x(Y1?y?z Cey Laz)x)aTbBcMd in which R1 is one or more kinds of rare earth element not including Y, Ce and La, “T” is one or more kinds of transition metal, and includes Fe or Fe and Co as an essential component, “M” is an element having Ga or Ga and one or more kinds selected from Sn, Bi and Si, and 0.4?x?0.7, 0.00?y+z?0.20, 0.16?a/b?0.28, 0.050?c/b?0.075 and 0.005?d/b?0.028. The magnet includes a main phase, including a compound having a R2T14B type tetragonal structure, and a grain boundary phase. D10, D50, D90 of crystal grain diameter according to the main phase crystal grains satisfies the following formula: D50?4.00 ?m and (D90?D10)/D50?1.60. A coating rate of the grain boundary is 70.0% or more.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: February 18, 2020
    Assignee: TDK CORPORATION
    Inventors: Keiji Takeda, Shota Miyazaki
  • Patent number: 10529474
    Abstract: To provide a permanent magnet which uses Ce of an abundant resource and has a great magnetic anisotropy in rare earth permanent magnets. To obtain a permanent magnet having a high magnetic anisotropy due to the trivalent Ce state by setting the abundance ratio C3/(C3+C4) in the main phase grains to be 0.1?C3/(C3+C4)?0.5 where C3 denotes the number of trivalent Ce atoms and C4 denotes the number of tetravalent Ce atoms.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: January 7, 2020
    Assignee: TDK CORPORATION
    Inventors: Shogo Kadota, Kenichi Suzuki, Yuji Umeda, Ryuji Hashimoto, Keiji Takeda
  • Patent number: 10513820
    Abstract: A soil resistant fiber structure, including a fiber and a soil resistant resin fixed to at least a part of a surface of the fiber, wherein the resin has, in at least a part inside the resin, one or more regions dyed with osmium oxide as observed with a transmission electron microscope, at least one of the regions is circular, the regions have a maximum diameter of 100 nm or more and 500 nm or less, and the soil resistant fiber structure has a mass concentration ratio of oxygen atoms to fluorine atoms (O/F) of 3 or more as obtained by measuring the surface of the fiber with an energy dispersive X-ray analyzer. The present invention provides a fiber structure having high anti-adhesion property against aqueous soils and oily soils as well as soil release property by washing.
    Type: Grant
    Filed: July 1, 2016
    Date of Patent: December 24, 2019
    Assignee: Toray Industries, Inc.
    Inventors: Azuki Otsuka, Shinya Komori, Rumi Karasawa, Keiji Takeda
  • Publication number: 20190343083
    Abstract: An easy-to-fit measuring instrument is provided. A measuring instrument (10) includes: a main wearable unit (1) to be fitted either to a neck of an animal on which measurement is to be made or close to the neck; and an electrode belt (5) including an electrode (6) to be fitted, for measurement of biological information, in such a manner that the electrode is in contact with at least either one of left and right axillae of the animal, wherein the electrode belt has a first end that is connected to the main wearable unit and a second end that is to be connected to the main wearable unit in a location that is closer to a back of the animal than the first end is close to the back of the animal.
    Type: Application
    Filed: February 5, 2018
    Publication date: November 14, 2019
    Inventors: Azusa NAKANO, Hiroshi SAKAYA, Tetsuya HAYASHI, Keiji TAKEDA
  • Publication number: 20190217286
    Abstract: The present invention relates to an ion exchange fiber including: a core fiber; and an ion exchange layer that is disposed at a vicinity of the core fiber and includes a crosslinked polymer compound having an ion exchange group, in which, in a cross section perpendicular to a longitudinal direction of the ion exchange fiber, an area of the ion exchange layer occupies 50% or more and 90% or less of a total cross sectional area, and the ion exchange fiber has a swelling ratio of 50% or less.
    Type: Application
    Filed: August 29, 2017
    Publication date: July 18, 2019
    Applicant: TORAY INDUSTRIES, INC.
    Inventors: Ryoma MIYAMOTO, Keisuke YONEDA, Ryuichiro HIRANABE, Satoko KANAMORI, Keiji TAKEDA, Noriko NAGAI, Naoki ASAI
  • Publication number: 20190144644
    Abstract: A rubber composition for tires is disclosed, which is capable of improving fuel efficiency, wear resistance, wet grip performance, and snow braking performance, and also a pneumatic tire using the same. A rubber composition for tires, including a rubber component containing at least a natural rubber and a butadiene rubber, an inorganic filler, a thermoplastic elastomer containing a functional group that reacts or interacts with a surface functional group of the inorganic filler and having a specific gravity of 1.00 or less, and a phosphate having a coagulation point of ?55° C.
    Type: Application
    Filed: October 24, 2018
    Publication date: May 16, 2019
    Applicant: Toyo Tire & Rubber Co., Ltd.
    Inventor: Keiji Takeda