Patents by Inventor Kei Sakamoto

Kei Sakamoto 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: 20200012026
    Abstract: A phase difference plate including a layer of a liquid crystal material oriented in an in-plane direction, wherein an in-plane retardation Re(?) at a wavelength ? nm of the phase difference plate satisfes the following formulae (e1) and (e2): {Re(400)-Re(550)}/{Re(550)-Re(700)}<2.90 (e1), and Re(400)/Re(700) >1.13 (e2); as well as a multilayer phase difference plate including the same, a polarizing plate including the same, and an image display device including the same.
    Type: Application
    Filed: March 16, 2018
    Publication date: January 9, 2020
    Applicant: ZEON CORPORATION
    Inventors: Masakazu SAITO, Kazuhiro OSATO, Masashi AIMATSU, Kei SAKAMOTO
  • Patent number: 10508072
    Abstract: The present disclosure provides a method for producing an acid halide solution that is useful as a production intermediate or the like that allows industrially advantageous production of a polymerizable liquid crystal compound. The method for producing an acid halide solution of the present disclosure includes a step ? of reacting a halogenating agent and a dicarboxylic acid compound in a water-immiscible organic solvent in the presence of a tetraalkylammonium salt to obtain a water-immiscible organic solvent solution including an acid halide, and a step ? of concentrating the obtained water-immiscible organic solvent solution.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: December 17, 2019
    Assignee: ZEON CORPORATION
    Inventors: Kumi Okuyama, Kei Sakamoto, Kanako Sanuki, Hiroki Iwaki
  • Publication number: 20190360074
    Abstract: A covered electrical wire comprising a conductor and an insulating covering layer provided outside the conductor, the conductor being a stranded wire composed of a strand of a plurality of copper alloy wires: composed of a copper alloy containing Fe in an amount of 0.2% by mass or more and 1.5% by mass or less, P in an amount of 0.05% by mass or more and 0.7% by mass or less, Mg in an amount of 0.01% by mass or more and 0.5% by mass or less, and one or more elements selected from C, Si and Mn in an amount of 10 ppm by mass or more and 500 ppm by mass or less in total, with the balance being Cu and impurities; and having a wire diameter of 0.5 mm or less.
    Type: Application
    Filed: November 2, 2017
    Publication date: November 28, 2019
    Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., AUTONETWORKS TECHNOLOGIES, LTD., SUMITOMO WIRING SYSTEMS, LTD.
    Inventors: Kei Sakamoto, Akiko Inoue, Tetsuya Kuwabara, Yoshihiro Nakai, Kazuhiro Nanjo, Kiyotaka Utsunomiya, Taichiro Nishikawa, Minoru Nakamoto, Yusuke Oshima, Yasuyuki Otsuka, Kinji Taguchi, Hiroyuki Kobayashi
  • Publication number: 20190359890
    Abstract: Provided is a compound represented by the following formula: Y1 to Y8 each represent a chemical single bond, —O—, —S—, —O—C(?O)—, —C(?O)—O—, —O—C(?O)—O—, —NR1—C(?O)—, —C(?O)—NR1—, —O—C(?O)—NR1—, —NR1—C(?O)—O—, —NR1—C(?O)—NR1—, —O—NR1—, or —NR1—O—, R1 being a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. G1 and G2 each represent a divalent linear aliphatic group having 1 to 20 carbon atoms. that optionally includes —O—, —S—, —O—C(?O)—, —C(?O)—O—, —O—C(?O)—O—, —NR3—C(?O)—, —C(?O—NR3—, —NR3—, or —C(?O)—. Z1 and Z2 each represent an alkenyl group having 2 to 10 carbon atoms. A1 represents a trivalent aromatic group. A2 and A3 each represent a divalent alicyclic hydrocarbon group having 3 to 30 carbon atoms. A4 and A5 each represents a divalent aromatic group having 6 to 30 carbon atoms. Q1 represents a alkyl group having 1 to 6 carbon atoms, an organic group having 2 to 30 carbon atoms that includes at least one of an aromatic hydrocarbon ring and a heteroaromatic ring, or a hydrogen atom.
    Type: Application
    Filed: July 16, 2019
    Publication date: November 28, 2019
    Applicant: ZEON CORPORATION
    Inventors: Kei SAKAMOTO, Kumi OKUYAMA
  • Patent number: 10487065
    Abstract: A polymerizable compound has a practical low melting point, excellent solubility in a general-purpose solvent, and can produce an optical film at low cost, exhibits low reflected luminance, and achieves uniform conversion of polarized light over a wide wavelength band, an optically anisotropic article.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: November 26, 2019
    Assignee: ZEON CORPORATION
    Inventors: Kei Sakamoto, Satoshi Kiriki, Kumi Okuyama, Kanako Taira
  • Publication number: 20190355489
    Abstract: A covered electrical wire comprising a conductor and an insulating covering layer provided outside the conductor, the conductor being a stranded wire composed of a strand of a plurality of copper alloy wires: composed of a copper alloy containing Fe in an amount of 0.1% by mass or more and 1.6% by mass or less, Pin an amount of 0.05% by mass or more and 0.7% by mass or less, and Sn in an amount of 0.05% by mass or more and 0.7% by mass or less, with the balance being Cu and impurities; and having a wire diameter of 0.5 mm or less, the copper alloy wire having a tensile strength of 385 MPa or more and a work-hardening exponent of 0.1 or more.
    Type: Application
    Filed: June 21, 2017
    Publication date: November 21, 2019
    Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., AUTONETWORKS TECHNOLOGIES, LTD., SUMITOMO WIRING SYSTEMS, LTD.
    Inventors: Kei SAKAMOTO, Akiko INOUE, Tetsuya KUWABARA, Minoru NAKAMOTO, Yusuke OSHIMA, Yoshihiro NAKAI, Kazuhiro NANJO, Taichiro NISHIKAWA, Kiyotaka UTSUNOMIYA, Yasuyuki OOTSUKA, Kinji TAGUCHI, Hiroyuki KOBAYASHI
  • Patent number: 10470644
    Abstract: A plug as an optical connector is configured to connect mechanically and optically with a receptacle, wherein part of an optical fiber for transmitting an optical signal is disposed internally. The plug includes a tubular plug-side first outer wall into which the optical fiber is inserted, configured to cover an optical signal-emitting end of the optical fiber. An end side of the plug-side first outer wall to be connected to the receptacle is sealed by a plug-side cover member translucent to an optical signal. In the optical connector intrusion of liquid and foreign substances can be suppressed, and reliability of optical communication can be ensured.
    Type: Grant
    Filed: May 15, 2015
    Date of Patent: November 12, 2019
    Assignees: SONY CORPORATION, SONY OLYMPUS MEDICAL SOLUTIONS INC.
    Inventors: Masahiro Hagihara, Kei Tomatsu, Kenji Sakamoto
  • Publication number: 20190341164
    Abstract: A covered electrical wire comprises a conductor and an insulating covering layer provided outside the conductor, the conductor being a stranded wire composed of a strand of a plurality of copper alloy wires: composed of a copper alloy containing Fe in an amount of 0.2% by mass or more and 1.6% by mass or less, P in an amount of 0.05% by mass or more and 0.4% by mass or less, and Sn in an amount of 0.05% by mass or more and 0.7% by mass or less, with the balance being Cu and impurities, and having a mass ratio of Fe/P of 4.0 or more; and having a wire diameter of 0.5 mm or less.
    Type: Application
    Filed: December 28, 2016
    Publication date: November 7, 2019
    Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., AUTONETWORKS TECHNOLOGIES, LTD., SUMITOMO WIRING SYSTEMS, LTD.
    Inventors: Kei Sakamoto, Akiko Inoue, Tetsuya Kuwabara, Minoru Nakamoto, Yusuke Oshima, Yoshihiro Nakai, Kazuhiro Nanjyo, Taichiro Nishikawa, Kiyotaka Utsunomiya, Yasuyuki Ootsuka, Kinji Taguchi, Hiroyuki Kobayashi
  • Publication number: 20190330399
    Abstract: The objective is to enable production of an optical film having good reverse wavelength dispersion. A mixture contains polymerizable compounds indicated by formulae (I) and (V), shown below. In the formulae: Ar1 and Ar2 are each a prescribed heterocyclic group; A1 to A4 and B1 to B4 are each an optionally substituted alicyclic group or aromatic group; Y1 to Y4, L1 to L4, and Z1 to Z4 are each a prescribed group such as —O—, —CO—O—, or —O—CO—; R1 to R6 are each a hydrogen atom, a methyl group, or a chlorine atom; one of e and f is an integer of 1 to 3 and the other of e and f is an integer of 0 to 3; c, d, i, and j are each an integer of 1 to 20; and a, b, g, and h are each 0 or 1.
    Type: Application
    Filed: November 10, 2017
    Publication date: October 31, 2019
    Applicant: ZEON CORPORATION
    Inventors: Kei SAKAMOTO, Kumi OKUYAMA
  • Publication number: 20190322872
    Abstract: A polymerizable compound indicated by the following formula (I). In formula (I): Ar represents an optionally substituted aromatic hydrocarbon cyclic group/aromatic heterocyclic group; D represents an organic group having a carbon number of 1 to 67 and including an aromatic ring; Z1, Z2, and Y0 to Y4 each represent atomic bonding; L1 and L2 each represent a chain group; G represents an optionally substituted alicyclic group/aromatic group/alkylene group; A1, A2, B1, and B2 each represent an alicyclic group or an aromatic group; P1 and P2 each represent a hydrogen atom or a polymerizable group; and p and q are each, independently of one another, an integer of 0 to 2, with a proviso that cases in which p=0 and q=1 and in which p=1 and q=2 are excluded.
    Type: Application
    Filed: November 9, 2017
    Publication date: October 24, 2019
    Applicant: ZEON CORPORATION
    Inventors: Kei SAKAMOTO, Kumi OKUYAMA, Takanori MIMA
  • Publication number: 20190322936
    Abstract: Provided is a polymerizable compound that is useful in production of a polymer with which an optical film or the like having good reverse wavelength dispersion at long wavelengths can be produced. The polymerizable compound is indicated by formula (I-1), shown below. [In formula (I-1), Ar0 represents an aromatic hydrocarbon cyclic group having at least D0 as a substituent or an aromatic heterocyclic group having at least D0 as a substituent, and Ar1 represents an aromatic hydrocarbon cyclic group having at least D1 as a substituent or an aromatic heterocyclic group having at least D1 as a substituent, where D0 and D1 each represent, independently of one another, an organic group having a carbon number of 1 to 67 and including at least one aromatic ring selected from the group consisting of an aromatic hydrocarbon ring and an aromatic heterocyclic ring.
    Type: Application
    Filed: December 13, 2017
    Publication date: October 24, 2019
    Applicant: ZEON CORPORATION
    Inventors: Kei SAKAMOTO, Kumi OKUYAMA, Takanori MIMA
  • Publication number: 20190315893
    Abstract: Provided is a polymerizable compound usable in the preparation of an optical film, etc. having favorable reverse wavelength dispersibility.
    Type: Application
    Filed: December 14, 2017
    Publication date: October 17, 2019
    Applicant: ZEON CORPORATION
    Inventors: Kei SAKAMOTO, Kumi OKUYAMA
  • Publication number: 20190308248
    Abstract: In order to provide a method for producing silver nanowires in which a local maximum of optical absorption in the plasmon absorption band can be shifted toward the short wavelength side without making the wire diameter smaller, a method for producing silver nanowires includes a step of heating a mixed liquid of a dispersion of silver nanowires and metal ions of a transition metal that is different from silver, and reducing the metal ions, thereby intermittently precipitating clumps of the transition metal on a surface of the silver nanowires. The thus produced silver nanowires have metal clumps intermittently along the length direction, and a local maximum of optical absorption in the plasmon absorption band of the silver nanowires has been shifted toward the short wavelength side.
    Type: Application
    Filed: November 8, 2017
    Publication date: October 10, 2019
    Applicant: Microwave Chemical Co., Ltd.
    Inventors: Tomohisa YAMAUCHI, Kei SAKAMOTO
  • Publication number: 20190276634
    Abstract: Provided is an acrylic polymer composition comprising an acrylic polymer and a polyfunctional organic compound having a urea group, wherein the acrylic polymer composition has less than 50% decrease in molecular weight of the acrylic polymer when heated under conditions of 190° C. and 144 hours in air.
    Type: Application
    Filed: March 22, 2017
    Publication date: September 12, 2019
    Applicant: ZEON CORPORATION
    Inventors: Mitsuru SUGAWARA, Satoshi KIRIKI, Kei SAKAMOTO, Kazuhiro EJIRI
  • Patent number: 10400170
    Abstract: This polymerizable compound is represented by a formula (I), this polymerizable composition contains said polymerizable compound and a polymerization initiator, this polymer is obtained by polymerizing the polymerizable compound or polymerizable composition, and this optically anisotropic product is comprised from the polymer. In the formula, each of Y1 to Y8 represents —O—, —S—, —O—C(?O)—, —C(?O)—O—, etc., Ya represents —O—, —S—, —O—C(?O)—, —C(?O)—O—, etc., each of G1 and G2 represents a divalent linear aliphatic group having 1 to 20 carbon atoms, etc., each of Z1 and Z2 represents an alkenyl group having 2 to 10 carbon atoms, etc., Ax represents an organic group having an aromatic ring and 2 to 30 carbon atoms, A1 represents a trivalent aromatic group, etc., each of A2 and A3 represents a divalent alicyclic hydrocarbon group having 3 to 30 carbon atoms, each of A4 and A5 represents a divalent aromatic group having 4 to 30 carbon atoms, etc., Q1 represents an alkyl group having 1 to 6 carbon atoms, etc.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: September 3, 2019
    Assignee: ZEON CORPORATION
    Inventors: Kei Sakamoto, Kumi Okuyama
  • Publication number: 20190264107
    Abstract: Disclosed is a mixture containing polymerizable compounds having Formulas (III) and (IV) wherein Ar1 and Ar2 are divalent aromatic hydrocarbon or heteroaromatic ring group having D1 or D2 as a substituent; D1 and D2 are C1-C20 organic group having at least one aromatic ring selected from the group consisting of aromatic hydrocarbon ring and heteroaromatic ring; A11-A22 and B11-B22 are alicyclic or aromatic group which may have a substituent, Y11-Y22 and L11-L22 are single bond, —O—, —CO—, —CO—O—, —O—CO—, —NR21—CO—, —CO—NR22—, —O—CO—O—, —NR23—CO—O—, —O—CO—NR24— or —NR25—CO—NR26— where R21-R26 are hydrogen or C1-C6 alkyl group; R4-R9 are hydrogen, methyl group or chlorine; one of f and k is integer of 1 to 3 with the other being integer of 0 to 3; g, j, m and q are integer of 1 to 20; and h, i, n and p are 0 or 1.
    Type: Application
    Filed: May 13, 2019
    Publication date: August 29, 2019
    Applicant: ZEON CORPORATION
    Inventors: Kei SAKAMOTO, Kumi OKUYAMA, Satoshi KIRIKI
  • Patent number: 10396091
    Abstract: According to an embodiment, a semiconductor memory device comprises control gate electrodes, a first semiconductor layer, a gate insulating layer, a first contact, a second semiconductor layer, a second contact, and a first conductive layer. The control gate electrodes are stacked above a substrate. The first semiconductor layer faces the control gate electrodes. The gate insulating layer is provided between the control gate electrode and the first semiconductor layer. The first contact is connected to an upper end of the first semiconductor layer. The second contact is connected to a lower end of the first semiconductor layer via the second semiconductor layer. The first conductive layer is provided above the second contact. Moreover, an end of the first conductive layer closest to the first contact is closer to the first contact than an end of the second contact closest to the first contact.
    Type: Grant
    Filed: September 12, 2016
    Date of Patent: August 27, 2019
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventor: Kei Sakamoto
  • Patent number: 10392343
    Abstract: The present invention is a polymerizable compound represented by a general formula (I), a polymerazable composition, a polymer, and an optically anisotropic product.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: August 27, 2019
    Assignee: ZEON CORPORATION
    Inventors: Kei Sakamoto, Kumi Okuyama
  • Publication number: 20190259508
    Abstract: A connector terminal wire contains 0.1% by mass or more and 1.5% by mass or less of Fe, 0.02% by mass or more and 0.7% by mass or less of P, and 0% by mass or more and 0.7% by mass or less, in total, of at least one of Sn and Mg, with the balance being Cu and impurities.
    Type: Application
    Filed: September 12, 2017
    Publication date: August 22, 2019
    Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO ELECTRIC TOYAMA CO., LTD.
    Inventors: Akiko Inoue, Kei Sakamoto, Tetsuya Kuwabara, Taichiro Nishikawa, Kiyotaka Utsunomiya, Minoru Nakamoto, Yusuke Oshima, Yoshihiro Nakai, Kazuhiro Nanjo, Hitoshi Tsuchida, Dai Kamogawa
  • Publication number: 20190202948
    Abstract: The present invention relates to: a polymerizable compound represented by a formula (I), wherein each of Y1 to Y8 independently represents —O—, —O—C(?O)—, —C(?O)—O— or the like; each of A2, A3, G1, and G2 independently represents a divalent linear aliphatic group having 1 to 20 carbon atoms or the like; each of Z1 and Z2 independently represents an alkenyl group having 2 to 10 carbon atoms or the like; Ax represents an organic group having 2 to 30 carbon atoms that includes at least one aromatic ring; Ay represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms or the like; A1 represents a trivalent aromatic group or the like; each of A4 and A5 independently represents a divalent aromatic group having 6 to 30 carbon atoms or the like; and Q1 represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or the like; and others.
    Type: Application
    Filed: March 11, 2019
    Publication date: July 4, 2019
    Applicant: ZEON CORPORATION
    Inventor: Kei SAKAMOTO