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: 20160002374
    Abstract: According to the invention, a polymerizable compound, a polymerizable composition, and a polymer that have a low melting point at a practical level, exhibit excellent solubility in a general-purpose solvent, can be produced at low cost, and can produce an optical film that exhibits excellent transparency, and achieves uniform conversion of polarized light over a wide wavelength band, and an optically anisotropic article can be provided. In formula (I), Y1 to Y8 are, —O—, —O—C(?O)—, —C(?O)—O—, etc., G1 and G2 are a divalent linear aliphatic group of 1-20 carbon atoms, Z1 and Z2 are an alkenyl group of 2-10 carbon atoms that is substituted with a halogen atom, or unsubstituted, Ax is an organic group of 2-30 carbon atoms that includes at least one aromatic ring, Ay is a hydrogen atom, an alkyl group of 1-20 carbon atoms, etc.
    Type: Application
    Filed: February 12, 2014
    Publication date: January 7, 2016
    Applicant: ZEON CORPORATION
    Inventors: Kei SAKAMOTO, Satoshi KIRIKI, Kumi OKUYAMA, Kanako SANUKI
  • Patent number: 9207362
    Abstract: The present invention relates to: a copolymer comprising repeating units (I) and (II) in its molecule, wherein the content of the repeating units (I) and (II) are 5 to 90 mol % and 95 to 10 mol %, respectively, and a 0.5 g/dl methylene chloride solution of the copolymer having a reduced viscosity (?sp/c) at 20° C. of 0.3 to 2.0 dl/g; an optically anisotropic article comprising one type or two or more types of the copolymer, or a mixture that includes one type or two or more types of the copolymer, and an additional polymer; and an oriented polymer film obtained by stretching the film-like optically anisotropic article.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: December 8, 2015
    Assignee: ZEON CORPORATION
    Inventor: Kei Sakamoto
  • Patent number: 9207360
    Abstract: The present invention relates to a polymerizable compound represented by a formula (I). The present invention provides a polymerizable compound, a polymerizable composition, a polymer, and an optically anisotropic article that are capable of obtaining an optical film having a low melting point, having excellent solubility, capable of being manufactured at low cost, and capable of uniform polarized light conversion across a broad wavelength region. [In formula: Y1 to Y6 are independently a chemical single bond, —O—, —O—C(?O)—, —C(?O)—O— etc.; G1 and G2 are independently a divalent C1-C20 aliphatic group etc.; Z1 and Z2 are independently C2-C10 alkenyl group that is substituted with a halogen atom etc.; Ax is a C2-C30 organic group that includes at least one aromatic ring selected from a group consisting of an aromatic hydrocarbon ring and an aromatic hetero ring; Ay is a hydrogen atom, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C3-C12 cycloalkyl group etc.; A1 is a trivalent aromatic group etc.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: December 8, 2015
    Assignee: ZENO CORPORATION
    Inventors: Kei Sakamoto, Kumi Okuyama
  • Patent number: 9150677
    Abstract: The invention is a polymerizable compound represented by formula (I); a polymerizable composition comprising the polymerizable compound and an initiator; a polymer obtained by polymerizing the polymerizable compound or the polymerizable composition, and an optically anisotropic article comprising the polymer. In the formula, Q1 to Q3 are a hydrogen atom, and the like; X is a C4-12 divalent aromatic group, and the like; Y1 to Y12 are a chemical single bond, —O—, —O—C(?O)—, —C(?O)—O—, and the like; G1 to G4 are a C1-20 divalent aliphatic group, and the like; Z1 to Z4 are a C2-10 alkenyl group, and the like; A1 is a trivalent aromatic group, and the like; A2 to A7 are a C4-30 divalent aromatic group, and the like; and n is 0 or 1.
    Type: Grant
    Filed: June 14, 2012
    Date of Patent: October 6, 2015
    Assignee: ZEON CORPORATION
    Inventors: Kei Sakamoto, Kumi Okuyama
  • Patent number: 9153820
    Abstract: A binder composition for a non-aqueous battery electrode containing a binder and an ether compound represented by the formula (1), and an electrolyte solution composition for a non-aqueous battery containing an ether compound represented by the formula (1), wherein m and n each independently represent 0 or 1, and R1 represents a divalent linear hydrocarbon group which may have in the bond thereof one or more intervening groups selected from the group consisting of an oxygen atom, a sulfur atom, and a carbonyl group.
    Type: Grant
    Filed: June 28, 2011
    Date of Patent: October 6, 2015
    Assignee: ZEON CORPORATION
    Inventors: Kei Sakamoto, Natsuko Nakata, Yasuhiro Wakizaka
  • Publication number: 20150274647
    Abstract: The present invention relates to: a polymerizable compound represented by a formula (I); a polymerizable composition comprising the polymerizable compound and an initiator; a polymer obtained by polymerizing the polymerizable compound or the polymerizable composition; and an optically anisotropic article comprising the polymer [in the formula, Y1 to Y8 are a chemical single bond, —O—, —O—C(?O)—, —C(?O)—O—, or the like; G1 and G2 are a divalent aliphatic group having 1 to 20 carbon atoms, or the like; Z1 and Z2 are an alkenyl group having 2 to 10 carbon atoms, or the like; A1 is a tetravalent aromatic group, or the like; A2 and A3 are a divalent alicyclic hydrocarbon group having 3 to 30 carbon atoms, or the like; A4 and A5 are a divalent aromatic group having 4 to 30 carbon atoms, or the like; Ax1 and Ax2 are an organic group having 2 to 30 carbon atoms that includes an aromatic ring, or the like; Ay1 and Ay2 are a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or the like; Q1 and Q2 are a hydrogen
    Type: Application
    Filed: October 16, 2013
    Publication date: October 1, 2015
    Applicant: ZEON CORPORATION
    Inventors: Kei Sakamoto, Satoshi Kiriki, Kumi Okuyama
  • Publication number: 20150274872
    Abstract: The present invention pertains to: a polymerizable compound represented by a formula (I); a polymerizable composition comprising the polymerizable compound and an initiator; a polymer obtained by polymerizing the polymerizable compound or the polymerizable composition; and an optically anisotropic article comprising the polymer. The present invention provides a polymerizable compound, a polymerizable composition, and a polymer that have a practical low melting point, exhibit excellent solubility in a general-purpose solvent, can be produced at low cost, and can produce an optical film that achieves uniform conversion of polarized light over a wide wavelength band, and also provide an optically anisotropic article. [In the formula: Y1 to Y8 are a chemical single bond, —O—, —O—C(?O)—, —O—C(?O)—O—, etc.; G1 and G2 are a divalent aliphatic group having 1 to 20 carbon atoms, etc.; Z1 and Z2 are an alkenyl group having 2 to 10 carbon atoms that is substituted with a halogen atom, or unsubstituted, etc.
    Type: Application
    Filed: October 16, 2013
    Publication date: October 1, 2015
    Applicant: ZEON CORPORATION
    Inventors: Kei Sakamoto, Satoshi Kiriki, Kumi Okuyama
  • Patent number: 9142288
    Abstract: A semiconductor memory device according to an embodiment includes: a memory cell array including a plurality of first lines, a plurality of second lines, and memory cells disposed at each of intersections of the first lines and the second lines; and a control circuit configured to apply a first voltage to a selected first line, apply a second voltage having a voltage value which is smaller than that of the first voltage to a selected second line, and apply a third voltage and a fourth voltage to a non-selected first line and a non-selected second line, respectively. The control circuit is configured to apply a fifth voltage to one of the non-selected first lines that is adjacent to the selected first line, and apply a sixth voltage to one of the non-selected second lines that is adjacent to the selected second line.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: September 22, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kei Sakamoto, Masaki Kondo, Nobuaki Yasutake, Takayuki Okamura
  • Publication number: 20150232625
    Abstract: The present invention relates to: a copolymer comprising repeating units (I) and (II) in its molecule, wherein the content of the repeating units (I) and (II) are 5 to 90 mol % and 95 to 10 mol %, respectively, and a 0.5 g/dl methylene chloride solution of the copolymer having a reduced viscosity (?sp/c) at 20° C. of 0.3 to 2.0 dl/g; an optically anisotropic article comprising one type or two or more types of the copolymer, or a mixture that includes one type or two or more types of the copolymer, and an additional polymer; and an oriented polymer film obtained by stretching the film-like optically anisotropic article.
    Type: Application
    Filed: October 4, 2013
    Publication date: August 20, 2015
    Applicant: ZEON CORPORATION
    Inventor: Kei Sakamoto
  • Patent number: 9111858
    Abstract: A non-volatile semiconductor memory device includes a cell array layer including a first wire, one or more memory cells stacked on the first wire, and a second wire formed on the memory cell so as to cross the first wire, wherein the memory cell includes a current rectifying element and a variable resistance element, and an atomic composition ratio of nitrogen is higher than that of oxygen in a part of a sidewall of the current rectifying element.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: August 18, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Jun Nishimura, Nobuaki Yasutake, Kei Sakamoto, Takayuki Okamura
  • Publication number: 20150183902
    Abstract: The present invention relates to: a polymerizable compound (I), wherein Y1 to Y6 are a chemical single bond, —O—C(?O)—, —C(?O)—O— or the like, G1 and G2 are a divalent aliphatic group, Z1 and Z2 are an alkenyl group, Ax is a fused ring group represented by a formula (II), wherein X is —NR3—, an oxygen atom, a sulfur atom or the like, R3 is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and D is a substituted or unsubstituted ring having 1 to 20 carbon atoms that includes at least one nitrogen atom, Ay is a hydrogen atom, an alkyl group, A1 is a trivalent aromatic group or the like, A2 and A3 are a divalent aromatic group having 6 to 30 carbon atoms or the like, and Q1 is a hydrogen atom, or an alkyl group having 1 to 6 carbon atoms.
    Type: Application
    Filed: May 30, 2013
    Publication date: July 2, 2015
    Inventors: Kei Sakamoto, Kumi Okuyama
  • Publication number: 20150175564
    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. A carbonyl compound is useful as a raw material for producing the polymerizable compound. (In the formula (I), Y1 to Y8 represent —C(?O)—O—, G1 and G2 represent a C1-20 divalent linear aliphatic group, Z1 and Z2 represent a C2-10 alkenyl group that is unsubstituted, or substituted with a halogen atom, Ax represents a C2-30 organic group with at least one aromatic ring, Ay represents a hydrogen atom or C1-20 alkyl group, A1 represents a trivalent aromatic group, A2 and A3 represent a C3-30 divalent alicyclic hydrocarbon group, A4 and A5 represent a C6-30 divalent aromatic group or the like, and Q1 represents a hydrogen atom.
    Type: Application
    Filed: May 30, 2013
    Publication date: June 25, 2015
    Inventors: Kei Sakamoto, Satoshi Kiriki, Kumi Okuyama, Kanako Taira
  • Patent number: 9029490
    Abstract: The present invention provides a polymerizable compound represented by the following formula (I), a polymerizable composition that includes the polymerizable compound and an initiator, a polymer obtained by polymerizing the polymerizable compound or the polymerizable composition, and an optically anisotropic article that includes the polymer. The polymerizable compound, polymerizable composition, and polymer have a practical low melting point, exhibit an excellent solubility in a general-purpose solvent, can be produced at low cost, and may produce an optical film that achieves uniform conversion of polarized light over a wide wavelength band, and an optically anisotropic article.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: May 12, 2015
    Assignee: Zeon Corporation
    Inventors: Kei Sakamoto, Kumi Okuyama
  • Publication number: 20150124516
    Abstract: A semiconductor memory device according to an embodiment includes a memory cell array including memory cells, the memory cells each configured having a current rectifier element and a variable resistance element connected in series therein. Each of the memory cells has formed on a side surface thereof: a first insulating film provided on a side surface of the current rectifier element and the variable resistance element and having a composition ratio of a non-silicon element to silicon which is a first value; a silicon oxide film provided on a side surface of the first insulating film; and a second insulating film provided on a side surface of the silicon oxide film and having a composition ratio of a non-silicon element to silicon which is a second value. The first value is smaller than the second value.
    Type: Application
    Filed: December 22, 2014
    Publication date: May 7, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kei SAKAMOTO, Takayuki OKAMURA, Nobuaki YASUTAKE, Jun NISHIMURA
  • Publication number: 20150092473
    Abstract: A semiconductor memory device according to an embodiment includes: a memory cell array including a plurality of first lines, a plurality of second lines, and memory cells disposed at each of intersections of the first lines and the second lines; and a control circuit configured to apply a first voltage to a selected first line, apply a second voltage having a voltage value which is smaller than that of the first voltage to a selected second line, and apply a third voltage and a fourth voltage to a non-selected first line and a non-selected second line, respectively. The control circuit is configured to apply a fifth voltage to one of the non-selected first lines that is adjacent to the selected first line, and apply a sixth voltage to one of the non-selected second lines that is adjacent to the selected second line.
    Type: Application
    Filed: December 8, 2014
    Publication date: April 2, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kei SAKAMOTO, Masaki KONDO, Nobuaki YASUTAKE, Takayuki OKAMURA
  • Publication number: 20150087754
    Abstract: A condensed heterocyclic compound which is shown by the following formula (I) and a composition containing an (a) organic material and (b) at least one type of the condensed heterocyclic compound are provided. (Y indicates a chemical single bond, —S(?O)—, or —SO2—. Ra and Rb indicate substitutable C1 to C30 organic groups. Za and Zb indicate chemical single bonds or —SO2—. X1 and X2 indicate hydrogen atoms etc. n and m respectively independently indicate integers of 0 to 2, where one of n and m is not 0).
    Type: Application
    Filed: December 4, 2014
    Publication date: March 26, 2015
    Applicant: ZEON CORPORATION
    Inventors: Kei SAKAMOTO, Satoshi KIRIKI, Tomonori OGAWA, Masanobu SHINOHARA
  • Patent number: 8937830
    Abstract: A semiconductor memory device according to an embodiment includes a memory cell array including memory cells, the memory cells each configured having a current rectifier element and a variable resistance element connected in series therein. Each of the memory cells has formed on aside surface thereof: a first insulating film provided on aside surface of the current rectifier element and the variable resistance element and having a composition ratio of a non-silicon element to silicon which is a first value; a silicon oxide film provided on a side surface of the first insulating film; and a second insulating film provided on aside surface of the silicon oxide film and having a composition ratio of a non-silicon element to silicon which is a second value. The first value is smaller than the second value.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: January 20, 2015
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kei Sakamoto, Takayuki Okamura, Nobuaki Yasutake, Jun Nishimura
  • Patent number: 8937121
    Abstract: A condensed heterocyclic compound which is shown by the following formula (I) and a composition containing an (a) organic material and (b) at least one type of the condensed heterocyclic compound are provided. (Y indicates a chemical single bond, —S(?O)—, or —SO2—. Ra and Rb indicate substitutable C1 to C30 organic groups. Za and Zb indicate chemical single bonds or —SO2—. X1 and X2 indicate hydrogen atoms etc. n and m respectively independently indicate integers of 0 to 2, where one of n and m is not 0).
    Type: Grant
    Filed: January 28, 2011
    Date of Patent: January 20, 2015
    Assignee: Zeon Corporation
    Inventors: Kei Sakamoto, Satoshi Kiriki, Tomonori Ogawa, Masanobu Shinohara
  • Patent number: 8923031
    Abstract: A semiconductor memory device according to an embodiment includes: a memory cell array including a plurality of first lines, a plurality of second lines, and memory cells disposed at each of intersections of the first lines and the second lines; and a control circuit configured to apply a first voltage to a selected first line, apply a second voltage having a voltage value which is smaller than that of the first voltage to a selected second line, and apply a third voltage and a fourth voltage to a non-selected first line and a non-selected second line, respectively. The control circuit is configured to apply a fifth voltage to one of the non-selected first lines that is adjacent to the selected first line, and apply a sixth voltage to one of the non-selected second lines that is adjacent to the selected second line.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: December 30, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kei Sakamoto, Masaki Kondo, Nobuaki Yasutake, Takayuki Okamura
  • Patent number: 8917538
    Abstract: A nonvolatile semiconductor memory device includes a memory cell array including memory cells having a variable resistance element provided at intersections of crossing first and second lines, the memory cell array including third lines, fourth and fifth lines, and first and second diodes; and a control circuit which, when the memory cells include a selected memory cell, a selected first line connected to the selected memory cell and an unselected first line, and a selected second line connected to the selected memory cell and an unselected second line, supplies a first voltage to the selected first line, and supplies a second voltage to the unselected first line, and when the third lines include a selected third line electrically connected to the selected second line via one of the fourth line and a first diode, supplies a third voltage to the selected fourth line.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: December 23, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kei Sakamoto