Patents by Inventor Katumi Hiramatu

Katumi Hiramatu 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).

  • Method of sealing air holes in an optical fiber
    Patent number: 8800323
    Abstract: An optical fiber which, at an optical fiber connecting end having a plurality of voids around the periphery of a core, has a light-permeable substance, such as a resin or glass whose refractive index is lower than that of quartz type substances, filled in the voids adjacent to the connecting end. An optical fiber connecting section where an optical fiber having a plurality of voids in a clad around the periphery of a core is connected to another optical fiber, wherein the optical fiber is connected end-to-end to aforesaid another optical fiber through a refractive index matching agent whose refractive index at the minimum temperature in actual use is lower than that of the core.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: August 12, 2014
    Assignees: Hitachi Metals, Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Yoshinori Kurosawa, Bing Yao, Kazumasa Ohsono, Masao Tachikura, Hisanori Nakai, Toshio Kurashima, Eiji Araki, Katumi Hiramatu
  • Optical fiber, optical fiber connecting method, and optical connector
    Patent number: 7658550
    Abstract: An optical fiber which, at an optical fiber connecting end having a plurality of voids around the periphery of a core, has a light-permeable substance, such as a resin or glass whose refractive index is lower than that of quartz type substances, filled in the voids adjacent to the connecting end. An optical fiber connecting section where an optical fiber having a plurality of voids in a clad around the periphery of a core is connected to another optical fiber, wherein the optical fiber is connected end-to-end to aforesaid another optical fiber through a refractive index matching agent whose refractive index at the minimum temperature in actual use is lower than that of the core.
    Type: Grant
    Filed: March 5, 2008
    Date of Patent: February 9, 2010
    Assignees: Hitachi Cable Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Yoshinori Kurosawa, Bing Yao, Kazumasa Ohsono, Masao Tachikura, Hisanori Nakai, Toshio Kurashima, Eiji Araki, Katumi Hiramatu
  • Optical fiber, optical fiber connecting method, and optical connector
    Publication number: 20080253726
    Abstract: An optical fiber which, at an optical fiber connecting end having a plurality of voids around the periphery of a core, has a light-permeable substance, such as a resin or glass whose refractive index is lower than that of quartz type substances, filled in the voids adjacent to the connecting end. An optical fiber connecting section where an optical fiber having a plurality of voids in a clad around the periphery of a core is connected to another optical fiber, wherein the optical fiber is connected end-to-end to aforesaid another optical fiber through a refractive index matching agent whose refractive index at the minimum temperature in actual use is lower than that of the core.
    Type: Application
    Filed: March 5, 2008
    Publication date: October 16, 2008
    Applicants: HITACHI CABLE, LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoshinori Kurosawa, Bing Yao, Kazumasa Ohsono, Masao Tachikura, Hisanori Nakai, Toshio Kurashima, Eiji Araki, Katumi Hiramatu
  • Optical fiber, optical fiber connecting method, and optical connector
    Publication number: 20080250816
    Abstract: An optical fiber which, at an optical fiber connecting end having a plurality of voids around the periphery of a core, has a light-permeable substance, such as a resin or glass whose refractive index is lower than that of quartz type substances, filled in the voids adjacent to the connecting end. An optical fiber connecting section where an optical fiber having a plurality of voids in a clad around the periphery of a core is connected to another optical fiber, wherein the optical fiber is connected end-to-end to aforesaid another optical fiber through a refractive index matching agent whose refractive index at the minimum temperature in actual use is lower than that of the core.
    Type: Application
    Filed: March 5, 2008
    Publication date: October 16, 2008
    Applicants: HITACHI CABLE, LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Yoshinori Kurosawa, Bing Yao, Kazumasa Ohsono, Masao Tachikura, Hisanori Nakai, Toshio Kurashima, Eiji Araki, Katumi Hiramatu
  • Optical fiber, optical fiber connecting method, and optical connector
    Patent number: 7376315
    Abstract: An optical fiber which, at an optical fiber connecting end having a plurality of voids around the periphery of a core, has a light-permeable substance, such as a resin or glass whose refractive index is lower than that of quartz type substances, filled in the voids adjacent to the connecting end. An optical fiber connecting section where an optical fiber having a plurality of voids in a clad around the periphery of a core is connected to another optical fiber, wherein the optical fiber is connected end-to-end to aforesaid another optical fiber through a refractive index matching agent whose refractive index at the minimum temperature in actual use is lower than that of the core.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: May 20, 2008
    Assignees: Hitachi Cable, Ltd., Nippon Telegraph and Telephone Corp.
    Inventors: Yoshinori Kurosawa, Bing Yao, Kazumasa Ohsono, Masao Tachikura, Hisanori Nakai, Toshio Kurashima, Eiji Araki, Katumi Hiramatu
  • Optical fiber coiled cord
    Patent number: 7349610
    Abstract: An optical fiber coiled cord having a coil construction in which an optical fiber cord is spirally bent to obtain lengthwise stretchability, wherein the fiber coiled cord is provided with a stretch length control member which restricts lengthwise elongation.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: March 25, 2008
    Assignees: Hitachi Cable, Ltd., Nippon Telegraph and Telephone Corporation
    Inventors: Kazumasa Ohsono, Masao Tachikura, Yoshinori Kurosawa, Yoshikazu Namekawa, Kenji Kawase, Toshio Kurashima, Eiji Araki, Katumi Hiramatu
  • Optical fiber coiled cord
    Publication number: 20060257086
    Abstract: An optical fiber coiled cord having a coil construction in which an optical fiber cord is spirally bent to obtain lengthwise stretchability, wherein the fiber coiled cord is provided with a stretch length control member which restricts lengthwise elongation.
    Type: Application
    Filed: June 30, 2004
    Publication date: November 16, 2006
    Applicants: HITACHI CABLE, LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kazumasa Ohsono, Masao Tachikura, Yoshinori Kurosawa, Yoshikazu Namekawa, Kenji Kawase, Toshio Kurashima, Eiji Araki, Katumi Hiramatu
  • Optical fiber, optical fiber connecting method, and optical connector
    Publication number: 20060204195
    Abstract: An optical fiber which, at an optical fiber connecting end having a plurality of voids around the periphery of a core, has a light-permeable substance, such as a resin or glass whose refractive index is lower than that of quartz type substances, filled in the voids adjacent to the connecting end. An optical fiber connecting section where an optical fiber having a plurality of voids in a clad around the periphery of a core is connected to another optical fiber, wherein the optical fiber is connected end-to-end to aforesaid another optical fiber through a refractive index matching agent whose refractive index at the minimum temperature in actual use is lower than that of the core.
    Type: Application
    Filed: June 30, 2004
    Publication date: September 14, 2006
    Inventors: Yoshinori Kurosawa, Bing Yao, Kazumasa Ohsono, Masao Tachikura, Hisanori Nakai, Toshio Kurashima, Eiji Araki, Katumi Hiramatu