Patents by Inventor Keizo Takahama
Keizo Takahama 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: 8699841Abstract: A photosensitive resin composition which includes (A) a cyclic olefin; (B) at least either one of a monomer having a cyclic ether group and an oligomer having a cyclic ether group, having a refractive index different from that of the component (A); and (C) a photoacid generator, is provided.Type: GrantFiled: February 9, 2010Date of Patent: April 15, 2014Assignee: Sumitomo Bakelite Co., Ltd.Inventors: Tetsuya Mori, Keizo Takahama
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Patent number: 8420293Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.Type: GrantFiled: August 10, 2011Date of Patent: April 16, 2013Assignees: Sumitomo Bakelite Co., Ltd., Promerus, LLCInventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Patent number: 8208769Abstract: A substrate on which an optical element is mounted is provided, including: an optical element; an optical circuit substrate which is formed by an optical waveguide layer having a core portion and cladding portions; and an electrical circuit substrate on which is provided a mounting portion that is used for mounting the optical element, wherein the optical element is mounted on the electrical circuit substrate via the optical circuit substrate and wherein the optical circuit substrate has an optical element mounted thereon and is provided with a receptor structure having a conductive portion that conducts electricity between an electrode of the optical element and an electrode of the electrical circuit substrate.Type: GrantFiled: May 21, 2010Date of Patent: June 26, 2012Assignee: Sumitomo Bakelite Co., Ltd.Inventors: Koji Choki, Mutsuhiro Matsuyama, Kenji Miyao, Keizo Takahama, Tetsuya Mori, Kei Watanabe, Hiroshi Owari, Yoji Shirato
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Patent number: 8200058Abstract: An optical waveguide structure has excellent heat resistance and a low water absorbing property and can be manufactured with a low material cost. Such an optical waveguide structure includes: an optical waveguide having two surfaces, a core layer including core portions and cladding portions each having a refractive index lower than that of each of the core portions, the core layer having two surfaces, and cladding layers provided so as to make contact with the two surfaces of the core layer and having a refractive index lower than that of each of the core portions; and conductor layers provided on the two surfaces of the optical waveguide. In the optical waveguide structure, each of the cladding layers is formed of a norbornene-based polymer as a major component thereof.Type: GrantFiled: November 16, 2006Date of Patent: June 12, 2012Assignee: Sumitomo Bakelite Company, Ltd.Inventors: Koji Choki, Tetsuya Mori, Keizo Takahama, Makoto Fujiwara, Kei Watanabe, Hiroshi Owari
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Publication number: 20120064458Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.Type: ApplicationFiled: August 10, 2011Publication date: March 15, 2012Applicants: PROMERUS, LLC, SUMITOMO BAKELITE COMPANY LIMITEDInventors: Koji CHOKI, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Publication number: 20110286713Abstract: A photosensitive resin composition which includes (A) a cyclic olefin; (B) at least either one of a monomer having a cyclic ether group and an oligomer having a cyclic ether group, having a refractive index different from that of the component (A); and (C) a photoacid generator, is provided.Type: ApplicationFiled: February 9, 2010Publication date: November 24, 2011Applicant: Sumitomo Bakelite Co., Ltd.Inventors: Tetsuya Mori, Keizo Takahama
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Patent number: 8053166Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.Type: GrantFiled: September 3, 2009Date of Patent: November 8, 2011Assignees: Sumitomo Bakelite Co. Ltd., Promerus, LLC.Inventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Patent number: 8021825Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.Type: GrantFiled: September 3, 2009Date of Patent: September 20, 2011Assignees: Sumitomo Bakelite Co., Ltd., Promerus, LLC.Inventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Patent number: 7869670Abstract: A substrate on which an optical element is mounted is provided, including: an optical element; an optical circuit substrate which is formed by an optical waveguide layer having a core portion and cladding portions; and an electrical circuit substrate on which is provided a mounting portion that is used for mounting the optical element, wherein the optical element is mounted on the electrical circuit substrate via the optical circuit substrate and wherein the optical circuit substrate has an optical element mounted thereon and is provided with a receptor structure having a conductive portion that conducts electricity between an electrode of the optical element and an electrode of the electrical circuit substrate.Type: GrantFiled: May 30, 2007Date of Patent: January 11, 2011Assignee: Sumitomo Bakelite Co., Ltd.Inventors: Koji Choki, Mutsuhiro Matsuyama, Kenji Miyao, Keizo Takahama, Tetsuya Mori, Kei Watanabe, Hiroshi Owari, Yoji Shirato
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Patent number: 7820356Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.Type: GrantFiled: November 22, 2004Date of Patent: October 26, 2010Assignees: Sumitomo Bakelite Co. Ltd., Promerus, LLCInventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Publication number: 20100226606Abstract: A substrate on which an optical element is mounted is provided, including: an optical element; an optical circuit substrate which is formed by an optical waveguide layer having a core portion and cladding portions; and an electrical circuit substrate on which is provided a mounting portion that is used for mounting the optical element, wherein the optical element is mounted on the electrical circuit substrate via the optical circuit substrate and wherein the optical circuit substrate has an optical element mounted thereon and is provided with a receptor structure having a conductive portion that conducts electricity between an electrode of the optical element and an electrode of the electrical circuit substrate.Type: ApplicationFiled: May 21, 2010Publication date: September 9, 2010Applicant: SUMITOMO BAKELITE CO., LTD.Inventors: Koji CHOKI, Mutsuhiro Matsuyama, Kenji Miyao, Keizo Takahama, Tetsuya Mori, Kei Watanabe, Hiroshi Owari, Yoji Shirato
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Publication number: 20100067861Abstract: An optical waveguide structure has excellent heat resistance and a low water absorbing property and can be manufactured with a low material cost. Such an optical waveguide structure includes: an optical waveguide having two surfaces, a core layer including core portions and cladding portions each having a refractive index lower than that of each of the core portions, the core layer having two surfaces, and cladding layers provided so as to make contact with the two surfaces of the core layer and having a refractive index lower than that of each of the core portions; and conductor layers provided on the two surfaces of the optical waveguide. In the optical waveguide structure, each of the cladding layers is formed of a norbornene-based polymer as a major component thereof.Type: ApplicationFiled: November 16, 2006Publication date: March 18, 2010Applicant: SUMITOMO BAKELITE COMPANY LIMITEDInventors: Koji Choki, Tetsuya Mori, Keizo Takahama, Makoto Fujiwara, Kei Watanabe, Hiroshi Owari
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Publication number: 20100061688Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.Type: ApplicationFiled: September 3, 2009Publication date: March 11, 2010Applicants: SUMITOMO BAKELITE CO., LTD., PROMERUS, LLCInventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Publication number: 20100062378Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.Type: ApplicationFiled: September 3, 2009Publication date: March 11, 2010Applicants: SUMITOMO BAKELITE CO., LTD., PROMERUS, LLCInventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Publication number: 20090245720Abstract: A substrate on which an optical element is mounted is provided, including: an optical element; an optical circuit substrate which is formed by an optical waveguide layer having a core portion and cladding portions; and an electrical circuit substrate on which is provided a mounting portion that is used for mounting the optical element, wherein the optical element is mounted on the electrical circuit substrate via the optical circuit substrate and wherein the optical circuit substrate has an optical element mounted thereon and is provided with a receptor structure having a conductive portion that conducts electricity between an electrode of the optical element and an electrode of the electrical circuit substrate.Type: ApplicationFiled: May 30, 2007Publication date: October 1, 2009Applicant: SUMITOMO BAKELITE CO.,LTD.Inventors: Koji Choki, Mutsuhiro Matsuyama, Kenji Miyao, Keizo Takahama, Tetsuya Mori, Kei Watanabe, Hiroshi Owari, Yoji Shirato
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Publication number: 20070148566Abstract: Embodiments in accordance with the present invention provide waveguide structures and methods of forming such structures where core and laterally adjacent cladding regions are defined. Some embodiments of the present invention provide waveguide structures where core regions are collectively surrounded by laterally adjacent cladding regions and cladding layers and methods of forming such structures.Type: ApplicationFiled: November 22, 2004Publication date: June 28, 2007Applicant: SUMITOMO BAKELITE CO., LTD.Inventors: Koji Choki, Tetsuya Mori, Ramakrishna Ravikiran, Makoto Fujiwara, Keizo Takahama, Kei Watanabe, Hirotaka Nonaka, Yumiko Otake, Andrew Bell, Larry Rhodes, Dino Amoroso, Mutsuhiro Matsuyama
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Patent number: 5773509Abstract: A heat resistant resin composition comprising, as the main components,(A) 100 parts by weight of an organic solvent-soluble polyimide resin having a glass transition temperature of 350.degree. C. or less,(B) 5 to 100 parts by weight of an epoxy compound having at least two epoxy groups in one molecule, and(C) 0.1 to 20 parts by weight of a compound having an active hydrogen group which can react with the epoxy compound (B),a heat resistant film adhesive comprising, as the main components, the above components (A), (B) and (C), and a process for producing a heat resistant film adhesive by casting a solution of the above heat resistant resin composition on one side or both sides of a support.Type: GrantFiled: March 7, 1995Date of Patent: June 30, 1998Assignee: Sumitomo Bakelite Company LimitedInventors: Tatsuhiro Yoshida, Keizo Takahama, Syusaku Okamyo