Patents by Inventor Shiyoshi Yokoyama

Shiyoshi Yokoyama 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: 11061297
    Abstract: A nonlinear optically active copolymer having satisfactory orientation characteristics and able to allow for reduction in heat-induced orientation relaxation of a nonlinear optical material, and a nonlinear optical material obtained using the copolymer. The copolymer including at least a repeating unit A having adamantyl group and a repeating unit B having a nonlinear optically active moiety in one molecule, and an organic nonlinear optical material including the copolymer as a component.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: July 13, 2021
    Assignees: KYUSHU UNIVERSITY, NISSAN CHEMICAL INDUSTRIES, LTD.
    Inventors: Shiyoshi Yokoyama, Hiroki Miura, Daisuke Maeda, Kei Yasui, Tsubasa Kashino, Masaaki Ozawa
  • Patent number: 10754064
    Abstract: Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore. Solution: a chromophore comprising a donor structure D, a ?-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: August 25, 2020
    Assignees: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, SUMITOMO ELECTRIC INDUSTRIES, LTD., KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION
    Inventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
  • Publication number: 20190085199
    Abstract: A nonlinear optically active copolymer having satisfactory orientation characteristics and able to allow for reduction in heat-induced orientation relaxation of a nonlinear optical material, and a nonlinear optical material obtained using the copolymer. The copolymer including at least a repeating unit A having adamantyl group and a repeating unit B having a nonlinear optically active moiety in one molecule, and an organic nonlinear optical material including the copolymer as a component.
    Type: Application
    Filed: March 16, 2017
    Publication date: March 21, 2019
    Applicants: KYUSHU UNIVERSITY, NISSAN CHEMICAL INDUSTRIES, LTD.
    Inventors: Shiyoshi YOKOYAMA, Hiroki MIURA, Daisuke MAEDA, Kei YASUI, Tsubasa KASHINO, Masaaki OZAWA
  • Publication number: 20180224577
    Abstract: Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore. Solution: a chromophore comprising a donor structure D, a ?-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
    Type: Application
    Filed: April 3, 2018
    Publication date: August 9, 2018
    Applicants: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, SUMITOMO ELECTRIC INDUSTRIES, LTD., KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION
    Inventors: Akira OTOMO, Isao AOKI, Hideki MIKI, Hidehisa TAZAWA, Shiyoshi YOKOYAMA
  • Patent number: 9977150
    Abstract: Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore. Solution: a chromophore comprising a donor structure D, a ?-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: May 22, 2018
    Assignees: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, SUMITOMO ELECTRIC INDUSTRIES, LTD., KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION
    Inventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
  • Publication number: 20170242189
    Abstract: An optical waveguide which has sufficient orientation characteristics and its manufacturing processes are simple to be suitable for the manufacture of electro-optic elements and that can be reduced the power consumption by its large electro-optic characteristics and further can be thinned and stacked, and the material thereof. This material is characterized in a polymer compound that includes an oxazoline structure in a side chain, and an acid generator or a polyvalent carboxylic acid.
    Type: Application
    Filed: September 2, 2015
    Publication date: August 24, 2017
    Applicants: KYUSHU UNIVERSITY, NISSAN CHEMICAL INDUSTRIES, LTD.
    Inventors: Shiyoshi YOKOYAMA, Kazuhiro YAMAMOTO, Hiromu SATO, Daisuke MAEDA, Masaaki OZAWA, Kei YASUI
  • Patent number: 9594189
    Abstract: There is provided an optical waveguide which has appropriate orientation properties, a production process of which is simple so as to be suitable for producing an electro-optical element, and is able to reduce power consumption of the element due to excellent electro-optical properties, and further can be formed into a thin film and be layered; and a material for the optical waveguide. A cladding material of an optical waveguide, characterized by comprising a polymer compound including a triarylamine structure, and a nonlinear optical compound; and an optical waveguide produced by using the cladding material.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: March 14, 2017
    Assignees: NISSAN CHEMICAL INDUSTRIES, LTD., KYUSHU UNIVERSITY
    Inventors: Shiyoshi Yokoyama, Kazuhiro Yamamoto, Kei Yasui, Masaaki Ozawa, Keisuke Odoi
  • Patent number: 9488755
    Abstract: Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore. Solution: a chromophore comprising a donor structure D, a ?-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: November 8, 2016
    Assignees: National Institute of Information and Communications Technology, Sumitomo Electric Industries, Ltd., Kyushu University, National University Corporation
    Inventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
  • Publication number: 20160318889
    Abstract: Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore. Solution: a chromophore comprising a donor structure D, a ?-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
    Type: Application
    Filed: July 13, 2016
    Publication date: November 3, 2016
    Inventors: Akira OTOMO, Isao AOKI, Hideki MIKI, Hidehisa TAZAWA, Shiyoshi YOKOYAMA
  • Publication number: 20160313579
    Abstract: The present invention provides an electro-optic element including an optical waveguide that is constituted of a core layer made of an inorganic compound and a first clad layer and a second clad layer which are laminated so as to sandwich the core layer therebetween and are made of a dielectric material, and a first electrode layer and a second electrode layer that are formed so as to sandwich the core layer therebetween, the first clad layer, and the second clad layer, in which at least one of the first clad layer and the second clad layer contains an organic dielectric material having an electro-optic effect, and refractive indices of the first clad layer and the second clad layer are lower than a refractive index of the core layer.
    Type: Application
    Filed: December 11, 2014
    Publication date: October 27, 2016
    Inventors: Shiyoshi YOKOYAMA, Feng QIU, Junichiro ICHIKAWA, Satoshi OIKAWA, Youichi HOSOKAWA, Daisuke MAEDA
  • Publication number: 20150133588
    Abstract: There is provided a polymer matrix that can suppress the orientational relaxation of an organic nonlinear optical compound, and a composition containing this polymer matrix and an organic nonlinear optical compound, and an optical material obtained by using the composition. A composition including: a norbornene imide polymer having a structural unit of Formula [1]; and an organic nonlinear optical compound: (where R1 is a C1-12 alkyl group optionally having a substituent or a C6-10 aryl group optionally having a substituent).
    Type: Application
    Filed: May 14, 2013
    Publication date: May 14, 2015
    Inventors: Shiyoshi Yokoyama, Kazuhiro Yamamoto, Andrew Mark Spring, Daisuke Maeda, Masaaki Ozawa, Keisuke Odoi
  • Publication number: 20150048284
    Abstract: Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore. Solution: a chromophore comprising a donor structure D, a ?-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
    Type: Application
    Filed: June 27, 2014
    Publication date: February 19, 2015
    Inventors: Akira OTOMO, Isao AOKI, Hideki MIKI, Hidehisa TAZAWA, Shiyoshi YOKOYAMA
  • Patent number: 8846955
    Abstract: Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore. Solution: a chromophore comprising a donor structure D, a ?-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: September 30, 2014
    Assignees: National Institute of Information and Communications Technology, Sumitomo Electric Industries, Ltd., Kyushu University, National University Corporation
    Inventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
  • Publication number: 20140199038
    Abstract: There is provided an optical waveguide which has appropriate orientation properties, a production process of which is simple so as to be suitable for producing an electro-optical element, and is able to reduce power consumption of the element due to excellent electro-optical properties, and further can be formed into a thin film and be layered; and a material for the optical waveguide. A cladding material of an optical waveguide, characterized by comprising a polymer compound including a triarylamine structure, and a nonlinear optical compound; and an optical waveguide produced by using the cladding material.
    Type: Application
    Filed: August 13, 2012
    Publication date: July 17, 2014
    Applicants: KYUSHU UNIVERSITY, NISSAN CHEMICAL INDUSTRIES, LTD.
    Inventors: Shiyoshi Yokoyama, Kazuhiro Yamamoto, Kei Yasui, Masaaki Ozawa, Keisuke Odoi
  • Publication number: 20120172599
    Abstract: Problem to Be Solved: to provide a chromophore having a far superior nonlinear optical activity to conventional chromophores and to provide a nonlinear optical element comprising said chromophore. Solution: a chromophore comprising a donor structure D, a ?-conjugated bridge structure B, and an acceptor structure A, the donor structure D comprising an aryl group substituted with a substituted oxy group; and a nonlinear optical element comprising said chromophore.
    Type: Application
    Filed: August 24, 2010
    Publication date: July 5, 2012
    Inventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
  • Publication number: 20110318554
    Abstract: There is provided a polymer having a high refractive index without forming a complex with inorganic fine particles, being excellent in the solubility in an organic solvent and the coating properties during film formation, and having a high transparency, and further being capable of dispersing optically homogeneously a functional dye such as a nonlinear dye in a high concentration. A hyperbranched polymer containing a thioester group of Formula (1) below [where R1 is a hydrogen atom or a methyl group; Ar1 and Ar2 are independently an aromatic ring group constituted of 5 to 18 ring atoms that is optionally substituted with a C1-6 alkyl group, a C1-6 alkoxy group, a C1-6 alkylthio group, or a halogen atom, the aromatic ring group optionally contains a hetero atom, or is optionally an aromatic ring group formed by two or more fused rings; A? is a structure of Formula (2) or Formula (3) below; and n is the number of repeating unit structures and is an integer of 2 to 100,000].
    Type: Application
    Filed: January 27, 2010
    Publication date: December 29, 2011
    Applicants: NISSAN CHEMICAL INDUSTRIES, LTD., KYUSHU UNIVERSITY
    Inventors: Hideo Nagashima, Shiyoshi Yokoyama, Shin-ichiro Inoue, Azusa Inoue, Keisuke Kojima
  • Patent number: 7205428
    Abstract: The present invention is directed to novel thioether dendritic molecules which respond immediately by emission of light when stimulated with light or electric energy.
    Type: Grant
    Filed: January 17, 2003
    Date of Patent: April 17, 2007
    Assignee: National Institute of Information and Communications Technology, Incorporated Administrative Agency
    Inventors: Hideki Miki, Tatsuo Nakahama, Shiyoshi Yokoyama, Shinro Mashiko
  • Patent number: 6630578
    Abstract: Novel dendritic molecules are provided which respond immediately by emission of light when stimulated with light or electric energy, and are useful, for example, as switching material of memory. The dendritic molecules have a core, a branch structure composed of Unit 1 represented by the following formula: wherein, ring A stands for a homo or heterocyclic six membered ring, optionally other branched structures, and surface functional groups as essential constituents.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: October 7, 2003
    Assignee: Communications Research Laboratory, Independent Administrative Institution
    Inventors: Hideki Miki, Tatsuo Nakahama, Shiyoshi Yokoyama, Shinro Mashiko
  • Publication number: 20030171507
    Abstract: Purpose
    Type: Application
    Filed: January 17, 2003
    Publication date: September 11, 2003
    Inventors: Hideki Miki, Tatsuo Nakahama, Shiyoshi Yokoyama, Shinro Mashiko
  • Publication number: 20020072583
    Abstract: The object of the present invention is to provide novel dendritic molecules which respond immediately by emission of light when stimulated with light or electric energy, and are useful, for example, as switching material of memory.
    Type: Application
    Filed: November 20, 2001
    Publication date: June 13, 2002
    Inventors: Hideki Miki, Tatsuo Nakahama, Shiyoshi Yokoyama, Shinro Mashiko