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).
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Patent number: 11061297Abstract: 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: GrantFiled: March 16, 2017Date of Patent: July 13, 2021Assignees: KYUSHU UNIVERSITY, NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Shiyoshi Yokoyama, Hiroki Miura, Daisuke Maeda, Kei Yasui, Tsubasa Kashino, Masaaki Ozawa
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Patent number: 10754064Abstract: 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: GrantFiled: April 3, 2018Date of Patent: August 25, 2020Assignees: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, SUMITOMO ELECTRIC INDUSTRIES, LTD., KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATIONInventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
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Publication number: 20190085199Abstract: 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: ApplicationFiled: March 16, 2017Publication date: March 21, 2019Applicants: KYUSHU UNIVERSITY, NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Shiyoshi YOKOYAMA, Hiroki MIURA, Daisuke MAEDA, Kei YASUI, Tsubasa KASHINO, Masaaki OZAWA
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Publication number: 20180224577Abstract: 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: ApplicationFiled: April 3, 2018Publication date: August 9, 2018Applicants: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, SUMITOMO ELECTRIC INDUSTRIES, LTD., KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATIONInventors: Akira OTOMO, Isao AOKI, Hideki MIKI, Hidehisa TAZAWA, Shiyoshi YOKOYAMA
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Patent number: 9977150Abstract: 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: GrantFiled: July 13, 2016Date of Patent: May 22, 2018Assignees: NATIONAL INSTITUTE OF INFORMATION AND COMMUNICATIONS TECHNOLOGY, SUMITOMO ELECTRIC INDUSTRIES, LTD., KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATIONInventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
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Publication number: 20170242189Abstract: 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: ApplicationFiled: September 2, 2015Publication date: August 24, 2017Applicants: KYUSHU UNIVERSITY, NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Shiyoshi YOKOYAMA, Kazuhiro YAMAMOTO, Hiromu SATO, Daisuke MAEDA, Masaaki OZAWA, Kei YASUI
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Patent number: 9594189Abstract: 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: GrantFiled: August 13, 2012Date of Patent: March 14, 2017Assignees: NISSAN CHEMICAL INDUSTRIES, LTD., KYUSHU UNIVERSITYInventors: Shiyoshi Yokoyama, Kazuhiro Yamamoto, Kei Yasui, Masaaki Ozawa, Keisuke Odoi
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Patent number: 9488755Abstract: 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: GrantFiled: June 27, 2014Date of Patent: November 8, 2016Assignees: National Institute of Information and Communications Technology, Sumitomo Electric Industries, Ltd., Kyushu University, National University CorporationInventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
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Publication number: 20160318889Abstract: 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: ApplicationFiled: July 13, 2016Publication date: November 3, 2016Inventors: Akira OTOMO, Isao AOKI, Hideki MIKI, Hidehisa TAZAWA, Shiyoshi YOKOYAMA
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Publication number: 20160313579Abstract: 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: ApplicationFiled: December 11, 2014Publication date: October 27, 2016Inventors: Shiyoshi YOKOYAMA, Feng QIU, Junichiro ICHIKAWA, Satoshi OIKAWA, Youichi HOSOKAWA, Daisuke MAEDA
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Publication number: 20150133588Abstract: 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: ApplicationFiled: May 14, 2013Publication date: May 14, 2015Inventors: Shiyoshi Yokoyama, Kazuhiro Yamamoto, Andrew Mark Spring, Daisuke Maeda, Masaaki Ozawa, Keisuke Odoi
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Publication number: 20150048284Abstract: 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: ApplicationFiled: June 27, 2014Publication date: February 19, 2015Inventors: Akira OTOMO, Isao AOKI, Hideki MIKI, Hidehisa TAZAWA, Shiyoshi YOKOYAMA
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Patent number: 8846955Abstract: 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: GrantFiled: August 24, 2010Date of Patent: September 30, 2014Assignees: National Institute of Information and Communications Technology, Sumitomo Electric Industries, Ltd., Kyushu University, National University CorporationInventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
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Publication number: 20140199038Abstract: 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: ApplicationFiled: August 13, 2012Publication date: July 17, 2014Applicants: KYUSHU UNIVERSITY, NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Shiyoshi Yokoyama, Kazuhiro Yamamoto, Kei Yasui, Masaaki Ozawa, Keisuke Odoi
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Publication number: 20120172599Abstract: 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: ApplicationFiled: August 24, 2010Publication date: July 5, 2012Inventors: Akira Otomo, Isao Aoki, Hideki Miki, Hidehisa Tazawa, Shiyoshi Yokoyama
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Publication number: 20110318554Abstract: 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: ApplicationFiled: January 27, 2010Publication date: December 29, 2011Applicants: NISSAN CHEMICAL INDUSTRIES, LTD., KYUSHU UNIVERSITYInventors: Hideo Nagashima, Shiyoshi Yokoyama, Shin-ichiro Inoue, Azusa Inoue, Keisuke Kojima
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Patent number: 7205428Abstract: 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: GrantFiled: January 17, 2003Date of Patent: April 17, 2007Assignee: National Institute of Information and Communications Technology, Incorporated Administrative AgencyInventors: Hideki Miki, Tatsuo Nakahama, Shiyoshi Yokoyama, Shinro Mashiko
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Patent number: 6630578Abstract: 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: GrantFiled: November 20, 2001Date of Patent: October 7, 2003Assignee: Communications Research Laboratory, Independent Administrative InstitutionInventors: Hideki Miki, Tatsuo Nakahama, Shiyoshi Yokoyama, Shinro Mashiko
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Publication number: 20030171507Abstract: PurposeType: ApplicationFiled: January 17, 2003Publication date: September 11, 2003Inventors: Hideki Miki, Tatsuo Nakahama, Shiyoshi Yokoyama, Shinro Mashiko
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Publication number: 20020072583Abstract: 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: ApplicationFiled: November 20, 2001Publication date: June 13, 2002Inventors: Hideki Miki, Tatsuo Nakahama, Shiyoshi Yokoyama, Shinro Mashiko