Patents by Inventor Hisashi Izumita
Hisashi Izumita 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: 11947175Abstract: The present disclosure intends to facilitate tearing a metal sheath even in a case where the metal sheath is incorporated in an optical fiber cable. The optical fiber cable of the present disclosure includes a cable core arranged at a central portion and accommodating a plurality of optical fibers gathered together, an inner layer sheath arranged on an outer circumference of the cable core and sheathing the cable core, a metal sheath arranged on an outer circumference of the inner layer sheath and wound around the inner layer sheath, an outer layer sheath arranged on an outer circumference of the metal sheath and sheathing the metal sheath, and at least one outer sheath tearing string arranged in a longitudinal direction inside the metal sheath.Type: GrantFiled: January 31, 2020Date of Patent: April 2, 2024Assignee: Nippon Telegraph and Telephone CorporationInventors: Yuta Maruo, Hiroaki Tanioka, Hisashi Izumita, Yusuke Yamada, Shigekatsu Tetsutani, Yohei Endo
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Patent number: 11846819Abstract: An object is to provide a closure with a structure having a drainage function to eliminate water immersion into a coated optical fiber against temporary flooding and to prevent water from continuously contacting the coated optical fiber. Another object is to provide a closure with improved workability for opening and closing. A closure according to the present invention protects a connection part that connects a coated optical fiber enclosed in a optical fiber cable with a coated optical fiber enclosed in a optical fiber cable. The closure includes a coated optical fiber housing that divides an interior of the closure into a first space that is on a side of a road and has a main body cable insertion hole for inserting the optical fiber cables from an exterior and a second space that is on an opposite side of the road and includes the connection part.Type: GrantFiled: June 1, 2020Date of Patent: December 19, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akira Sakurai, Hiroaki Tanioka, Hisashi Izumita, Shigekatsu Tetsutani, Yusuke Yamada, Yuta Maruo
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Publication number: 20230213724Abstract: An object is to provide a closure with a structure having a drainage function to eliminate water immersion into a coated optical fiber against temporary flooding and to prevent water from continuously contacting the coated optical fiber. Another object is to provide a closure with improved workability for opening and closing. A closure according to the present invention protects a connection part that connects a coated optical fiber enclosed in a optical fiber cable with a coated optical fiber enclosed in a optical fiber cable. The closure includes a coated optical fiber housing that divides an interior of the closure into a first space that is on a side of a road and has a main body cable insertion hole for inserting the optical fiber cables from an exterior and a second space that is on an opposite side of the road and includes the connection part.Type: ApplicationFiled: June 1, 2020Publication date: July 6, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akira SAKURAI, Hiroaki TANIOKA, Hisashi IZUMITA, Shigekatsu TETSUTANI, Yusuke YAMADA, Yuta MARUO
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Publication number: 20230204896Abstract: An object of the present disclosure is to provide a method of laying an optical cable that is capable of laying and removing the optical cable in a stable place without civil engineering works. To achieve the above-mentioned object, a method of laying an optical cable according to the present disclosure includes laying the optical cable and two laying strips on a road surface or a wall surface so that the optical cable is sandwiched between side surfaces of the two laying strips.Type: ApplicationFiled: June 3, 2020Publication date: June 29, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yuta MARUO, Hiroaki TANIOKA, Hisashi IZUMITA, Shigekatsu TETSUTANI, Yusuke YAMADA, Akira SAKURAI
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Publication number: 20230073123Abstract: A method of laying an optical cable according to the present disclosure includes: installing a laying strip, in which the optical cable is to be embedded, on a road surface or a wall surface; forming a cut line, for embedding the optical cable, on the installed laying strip; and embedding the optical cable in the formed cut line.Type: ApplicationFiled: March 2, 2020Publication date: March 9, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yusuke YAMADA, Akira SAKURAI, Yuta MARUO, Shigekatsu TETSUTANI, Hisashi IZUMITA, Hiroaki TANIOKA
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Publication number: 20230076354Abstract: To surely fix an optical fiber cable including a nonmetallic tension member in a closure without damaging the tension member and a core. An optical fiber cable holding device according to the present disclosure includes: a thin plate portion configured, by bending a rectangular thin plate in a length direction thereof into a shape of a rough circle, to hold an outer periphery of an optical fiber cable; a binding mechanism portion fixed on one end of the thin plate portion and configured to bind and fix the thin plate portion wound around the optical fiber cable; protrusion fitting holes provided on the other end of the thin plate portion wound around the optical fiber cable; and a band-diameter adjuster fixed to the binding mechanism portion, including a protrusion to fittable into each of the protrusion fitting holes, and configured to adjust a diameter of the rough circle by changing from one hole to another hole of the protrusion fitting holes to be fitted onto the protrusion.Type: ApplicationFiled: February 28, 2020Publication date: March 9, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Akira SAKURAI, Hiroaki TANIOKA, Hisashi IZUMITA, Yusuke YAMADA, Yuta MARUO
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Patent number: 11422301Abstract: An optical fiber cable 100 includes at least one optical fiber core 140 and a sheath containing the optical fiber core. The optical fiber core 140 includes optical fibers 130. A total length of the optical fiber core 140 is longer than that of the sheath 160. The optical fiber core 140 is contained in the sheath 160 so that bending occurs in the optical fibers 130.Type: GrantFiled: June 20, 2019Date of Patent: August 23, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yusuke Yamada, Masashi Kikuchi, Hisashi Izumita, Junichi Kawataka, Kazunori Katayama
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Patent number: 11360281Abstract: An intermittent tape core wire (140) of an optical fiber cable is assembled into a cable core so that in a k core wire, an l core wire, and an m core wire composed of a multi-core optical fibers continuously adjacent in the width direction of the intermittent tape core wire (140), a difference ? between a core wire twisting direction D2km of the k core wire at a bonding portion (142) connecting the k core wire and the l core wire and a core wire twisting direction D2kl of the k core wire at a bonding portion (142) connecting the k core wire and the m core wire is different from when manufactured.Type: GrantFiled: July 2, 2019Date of Patent: June 14, 2022Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masashi Kikuchi, Yusuke Yamada, Hisashi Izumita, Junichi Kawataka, Kazunori Katayama
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Publication number: 20220155547Abstract: The present disclosure intends to facilitate tearing of a metal sheath even in a case where the metal sheath is incorporated in an optical fiber cable. The optical fiber cable of the present disclosure includes a cable core arranged at a central portion and accommodating a plurality of optical fibers gathered together, an inner layer sheath arranged on an outer circumference of the cable core and sheathing the cable core, a metal sheath arranged on an outer circumference of the inner layer sheath and wound around the inner layer sheath, an outer layer sheath arranged on an outer circumference of the metal sheath and sheathing the metal sheath, and at least one outer sheath tearing string arranged in a longitudinal direction inside the metal sheath.Type: ApplicationFiled: January 31, 2020Publication date: May 19, 2022Inventors: Yuta Maruo, Hiroaki Tanioka, Hisashi Izumita, Yusuke Yamada, Shigekatsu Tetsutani, Yohei Endo
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Publication number: 20210132314Abstract: An intermittent tape core wire (140) of an optical fiber cable is assembled into a cable core so that in a k core wire, an l core wire, and an m core wire composed of a multi-core optical fibers continuously adjacent in the width direction of the intermittent tape core wire (140), a difference ? between a core wire twisting direction D2km of the k core wire at a bonding portion (142) connecting the k core wire and the l core wire and a core wire twisting direction D2kl of the k core wire at a bonding portion (142) connecting the k core wire and the m core wire is different from when manufactured.Type: ApplicationFiled: July 2, 2019Publication date: May 6, 2021Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masashi KIKUCHI, Yusuke YAMADA, Hisashi IZUMITA, Junichi KAWATAKA, Kazunori KATAYAMA
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Publication number: 20210124113Abstract: An optical fiber cable 100 includes at least one optical fiber core 140 and a sheath containing the optical fiber core. The optical fiber core 140 includes optical fibers 130. A total length of the optical fiber core 140 is longer than that of the sheath 160. The optical fiber core 140 is contained in the sheath 160 so that bending occurs in the optical fibers 130.Type: ApplicationFiled: June 20, 2019Publication date: April 29, 2021Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yusuke YAMADA, Masashi KIKUCHI, Hisashi IZUMITA, Junichi KAWATAKA, Kazunori KATAYAMA
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Patent number: 7153570Abstract: An optical fiber cord which is a single core optical fiber cord having an outer diameter of 1.2 mm or less, and has a structure in which an optical fiber core wire having a resin coating is provided at the center, a tensile-strength-fiber layer is provided around the outer periphery of the optical fiber core wire, and a coating layer is further provided around the outer periphery of the tensile-strength-fiber layer, wherein the coating layer is composed of a non-halogen fire-retardant resin, is disclosed. This optical fiber cord has excellent fire retardant, mechanical and handling properties, although the outer diameter thereof is made smaller.Type: GrantFiled: November 15, 2004Date of Patent: December 26, 2006Assignee: The Furukawa Electric Co., Ltd.Inventors: Fuminori Nakajima, Nobuhisa Ishii, Masao Tachikura, Shigenori Uruno, Hisashi Izumita, Hitoshi Ishimaru, Kuniaki Yamaguchi
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Patent number: 7086789Abstract: An optical element module is equipped with a casing, an optical element provided inside the casing, a pipe which communicates the inside of the casing to the outside, and a primary coated optical fiber which is inserted through the pipe and connected to the optical element.Type: GrantFiled: August 26, 2003Date of Patent: August 8, 2006Assignee: NTT Electronics CorporationInventors: Nobuo Tomita, Fumiaki Hanawa, Norio Takato, Satoru Konno, Yuichi Kikuchi, Jyunko Katoh, Yoshitaka Enomoto, Akira Miyashita, Hisashi Izumita
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Patent number: 6893719Abstract: A single core optical fiber cord having an outer diameter of 1.2 mm or less, and having a structure in which an optical fiber core wire having a resin coating provided at the center, a tensile-strength-fiber layer around the periphery of the optical fiber core wire, and a coating layer around the outer periphery of the tensile-strength-fiber layer is provided. The coating layer can be composed of a non-halogen fire-retardant resin. The optical fiber cord has excellent fire retardant, mechanical and handling properties, although the outer diameter thereof is 1.2 mm or less.Type: GrantFiled: June 28, 2000Date of Patent: May 17, 2005Assignees: The Furukawa Electric Co., Ltd., Nippon Telegraph and Telephone Corporation, Okano Electric Wire Co., Ltd.Inventors: Fuminori Nakajima, Nobuhisa Ishii, Masao Tachikura, Shigenori Uruno, Hisashi Izumita, Hitoshi Ishimaru, Kuniaki Yamaguchi
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Publication number: 20050069273Abstract: An optical fiber cord which is a single core optical fiber cord having an outer diameter of 1.2 mm or less, and has a structure in which an optical fiber core wire having a resin coating is provided at the center, a tensile-strength-fiber layer is provided around the outer periphery of the optical fiber core wire, and a coating layer is further provided around the outer periphery of the tensile-strength-fiber layer, wherein the coating layer is composed of a non-halogen fire-retardant resin, is disclosed. This optical fiber cord has excellent fire retardant, mechanical and handling properties, although the outer diameter thereof is made smaller.Type: ApplicationFiled: November 15, 2004Publication date: March 31, 2005Inventors: Fuminori Nakajima, Nobuhisa Ishii, Masao Tachikura, Shigenori Uruno, Hisashi Izumita, Hitoshi Ishimaru, Kuniaki Yamaguchi
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Publication number: 20040202434Abstract: An optical element module is equipped with a casing, an optical element provided inside the casing, a pipe which communicates the inside of the casing to the outside, and a primary coated optical fiber which is inserted through the pipe and connected to the optical element.Type: ApplicationFiled: August 26, 2003Publication date: October 14, 2004Inventors: Nobuo Tomita, Fumiaki Hanawa, Norio Takato, Satoru Konno, Yuichi Kikuchi, Jyunko Katoh, Yoshitaka Enomoto, Akira Miyashita, Hisashi Izumita
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Patent number: 6256443Abstract: An optical fiber distribution module having a connection board, optical connector adaptors and a storage section is provided. An array of the optical connector adaptors forms the connection board, where the optical connectors connect in-use optical fibers. The storage section, located in a separate section of the module, stores optical fibers which are not-in use. The optical fiber distribution module also includes a plurality of cord sorting boards having a plurality of fiber cord passageways. The fiber cord passageways are configured to accommodate and retain at least one optical fiber such that the optical fiber is arranged between the connection board and the storage section. In addition, both the in-use and not-in use optical fibers insert into the fiber cord passageway.Type: GrantFiled: July 20, 1999Date of Patent: July 3, 2001Assignee: Nippon Telegraph and Telephone CorporationInventors: Shigenori Uruno, Masao Tachikura, Hisashi Izumita, Koji Mine, Yoshitaka Enomoto, Naoki Nakao, Nobuo Tomita, Akira Hirooka, Hajime Takemoto