Patents by Inventor Tetsuya Yasutomi
Tetsuya Yasutomi 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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Publication number: 20240085654Abstract: An optical fiber ribbon includes a plurality of colored single fibers that are arranged side by side, and the adjacent single fibers are coupled by coupling resin. The single fibers are disposed leaving a gap between the single fibers. The adjacent single fibers are bonded to each other intermittently by coupling parts at predetermined intervals in a longitudinal direction. That is, the coupling parts between the adjacent single fibers are disposed intermittently with regard to the longitudinal direction of the single fibers. The coupling parts are formed of opaque coupling resin. A haze value of the coupling resin according to JIS K 7136 is preferably between 1.5% and 3%, for example.Type: ApplicationFiled: November 14, 2023Publication date: March 14, 2024Inventor: Tetsuya Yasutomi
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Publication number: 20230123198Abstract: An optical fiber ribbon is configured by arranging in parallel and coupling a plurality of single-core optical fibers. The optical fibers adjacent to each other are intermittently bonded by coupling parts at predetermined intervals in the longitudinal direction of the optical fiber ribbon. The coupling parts adjacent to each other in the width direction are disposed to be displaced from each other in the longitudinal direction of the optical fiber ribbon. In the optical fiber ribbon, the adjacent optical fibers are intermittently coupled by the coupling parts in the longitudinal direction, and the amounts of resin of the coupling parts are not uniform in the longitudinal direction of the optical fibers. Moreover, the Young's modulus of resin constituting the coupling part is preferably 130 MPa or less, and more preferably 80 MPa or less.Type: ApplicationFiled: December 15, 2022Publication date: April 20, 2023Inventor: Tetsuya Yasutomi
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Patent number: 11513302Abstract: A jacket is provided to the outer circumference of a cable core, a rip cord, and a tension member. The cable core, the rip cord, and the tension member are collectively covered by the jacket. A wrapping tape is longitudinally placed on the outer circumference of a core part so as to be wound therearound. Thus, immediately after the wrapping tape is longitudinally placed and wound, a wrap part thereof is formed so as to lie substantially straight in the axial direction of an optical fiber cable. In contrast, in an optical fiber cable, the cable core is obtained by combining and intertwining the core part and the wrapping tape. Because of this configuration, the wrap part of the wrapping tape is helically disposed in the longitudinal direction.Type: GrantFiled: June 25, 2021Date of Patent: November 29, 2022Assignee: FURUKAWA ELECTRIC CO., LTD.Inventor: Tetsuya Yasutomi
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Publication number: 20220373753Abstract: This optical fiber cable is a central-core-type cable in which slotted rods are not used, and is composed of a core, a wrapper, a tension member, a ripcord, a sheath, and the like. The core is formed by twisting together a plurality of optical fiber units without back-twisting. The optical fiber units are formed by twisting together a plurality of intermittently-fixed optical fiber ribbons. A direction in which the optical fiber ribbons are twisted together is same as a direction in which the optical fiber units are twisted together.Type: ApplicationFiled: August 2, 2022Publication date: November 24, 2022Inventor: Tetsuya Yasutomi
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Publication number: 20210325620Abstract: A jacket is provided to the outer circumference of a cable core, a rip cord, and a tension member. The cable core, the rip cord, and the tension member are collectively covered by the jacket. A wrapping tape is longitudinally placed on the outer circumference of a core part so as to be wound therearound. Thus, immediately after the wrapping tape is longitudinally placed and wound, a wrap part thereof is formed so as to lie substantially straight in the axial direction of an optical fiber cable. In contrast, in an optical fiber cable, the cable core is obtained by combining and intertwining the core part and the wrapping tape. Because of this configuration, the wrap part of the wrapping tape is helically disposed in the longitudinal direction.Type: ApplicationFiled: June 25, 2021Publication date: October 21, 2021Inventor: Tetsuya Yasutomi
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Patent number: 9604742Abstract: Provided is a method for packing a cable having a static friction coefficient of 0.15 or more and 0.50 or less, a dynamic friction coefficient of 0.10 or more and 0.40 or less and a bending rigidity of 60 gf or more and 350 gf or less. The method includes the steps of: (1) winding the cable into a figure-of-eight shape to form a cylindrical cable bundle, (2) winding a wrapping film as a restraining member, which restrains the cable bundle, around an outer circumferential portion of the cable bundle, (3) winding a wrapping film as a closing member which closes openings on both ends of the cable bundle, and (4) housing the cable bundle being wound with the restraining member and the closing member in a housing container.Type: GrantFiled: April 28, 2014Date of Patent: March 28, 2017Assignees: FURUKAWA ELECTRIC CO., LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tetsuya Yasutomi, Masayoshi Tsukamoto, Noboru Okada, Shigeo Kimura, Shigeo Kihara, Keiichiro Sugimoto, Shinichi Niwa
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Publication number: 20140230375Abstract: Provided is a method for packing a cable having a static friction coefficient of 0.15 or more and 0.50 or less, a dynamic friction coefficient of 0.10 or more and 0.40 or less and a bending rigidity of 60 gf or more and 350 gf or less. The method includes the steps of: (1) winding the cable into a figure-of-eight shape to form a cylindrical cable bundle, (2) winding a wrapping film as a restraining member, which restrains the cable bundle, around an outer circumferential portion of the cable bundle, (3) winding a wrapping film as a closing member which closes openings on both ends of the cable bundle, and (4) housing the cable bundle being wound with the restraining member and the closing member in a housing container.Type: ApplicationFiled: April 28, 2014Publication date: August 21, 2014Applicants: Furukawa Electric Co., Ltd., Nippon Telegraph and Telephone Corp.Inventors: Tetsuya YASUTOMI, Masayoshi TSUKAMOTO, Noboru OKADA, Shigeo KIMURA, Shigeo KIHARA, Keiichiro SUGIMOTO, Shinichi NIWA
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Patent number: 8412011Abstract: It is an object of the present invention to provide an optical fiber cable which can reliably prevent increased transmission loss due to damage of the optical fiber as a result of the egg-laying behavior of cicadas. The cable includes at least an optical fiber 1, tension members 6 and a sheath 3. The sheath 3 has a shore D hardness of 55 or more and a minimum distance L from a surface of the optical fiber 1 to an outer surface of the sheath 3 of greater than 0.3 mm. Further, in the cable, the surface of sheath 3 has a coefficient of friction of 0.45 or less and the sheath 3 has a shore D hardness of 57 or more. In addition, the cable is made by using a specific flame retardant composition (P) as the sheath material.Type: GrantFiled: August 6, 2010Date of Patent: April 2, 2013Assignee: The Furukawa Electric Co., Ltd.Inventors: Tetsuya Yasutomi, Masayoshi Tsukamoto, Mitsuru Iwano, Yoshihisa Rintsu, Masanobu Aragaki, Masaki Nishiguchi
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Publication number: 20110132786Abstract: A packing configuration of a cable hardly collapsing the cylindrical shape of a cable bundle and hardly producing a bending tendency and a knot on the cable. The packing configuration includes the cylindrical cable bundle formed by coiling the cable in an 8-shape, a binding member which is disposed on the outer peripheral part of the cable bundle and which binds the cable bundle, and a storage container for storing the cable bundle and the binding member.Type: ApplicationFiled: August 6, 2009Publication date: June 9, 2011Inventors: Tetsuya Yasutomi, Masayoshi Tsukamoto, Noboru Okada, Shigeo Kimura, Shigeo Kihara, Keiichiro Sugimoto, Shinichi Niwa
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Publication number: 20100322573Abstract: It is an object of the present invention to provide an optical fiber cable which can reliably prevent increased transmission loss due to damage of the optical fiber as a result of the egg-laying behavior of cicadas. The cable includes at least an optical fiber 1, tension members 6 and a sheath 3. The sheath 3 has a shore D hardness of 55 or more and a minimum distance L from a surface of the optical fiber 1 to an outer surface of the sheath 3 of greater than 0.3 mm. Further, in the cable, the surface of sheath 3 has a coefficient of friction of 0.45 or less and the sheath 3 has a shore D hardness of 57 or more. In addition, the cable is made by using a specific flame retardant composition (P) as the sheath material.Type: ApplicationFiled: August 6, 2010Publication date: December 23, 2010Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Tetsuya YASUTOMI, Masayoshi Tsukamoto, Mitsuru Iwano, Yoshihisa Rintsu, Masanobu Aragaki, Masaki Nishiguchi
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Patent number: 7813606Abstract: It is an object of the present invention to provide an optical fiber cable which can reliably prevent increased transmission loss due to damage of the optical fiber as a result of the egg-laying behavior of cicadas. The cable includes at least an optical fiber 1, tension members 6 and a sheath 3. The sheath 3 has a shore D hardness of 55 or more and a minimum distance L from a surface of the optical fiber 1 to an outer surface of the sheath 3 of greater than 0.3 mm. Further, in the cable, the surface of sheath 3 has a coefficient of friction of 0.45 or less and the sheath 3 has a shore D hardness of 57 or more. In addition, the cable is made by using a specific flame retardant composition (P) as the sheath material.Type: GrantFiled: October 9, 2008Date of Patent: October 12, 2010Assignee: The Furukawa Electric Co., Ltd.Inventors: Tetsuya Yasutomi, Masayoshi Tsukamoto, Mitsuru Iwano, Yoshihisa Rintsu, Masanobu Aragaki, Masaki Nishiguchi
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Publication number: 20090034922Abstract: It is an object of the present invention to provide an optical fiber cable which can reliably prevent increased transmission loss due to damage of the optical fiber as a result of the egg-laying behavior of cicadas. The cable includes at least an optical fiber 1, tension members 6 and a sheath 3. The sheath 3 has a shore D hardness of 55 or more and a minimum distance L from a surface of the optical fiber 1 to an outer surface of the sheath 3 of greater than 0.3 mm. Further, in the cable, the surface of sheath 3 has a coefficient of friction of 0.45 or less and the sheath 3 has a shore D hardness of 57 or more. In addition, the cable is made by using a specific flame retardant composition (P) as the sheath material.Type: ApplicationFiled: October 9, 2008Publication date: February 5, 2009Applicant: THE FURUKAWA ELECTRIC CO., LTD.Inventors: Tetsuya YASUTOMI, Masayoshi Tsukamoto, Mitsuru Iwano, Yoshihisa Rintsu, Masanobu Aragaki, Masaki Nishiguchi
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Patent number: 6785452Abstract: An optical fiber cable that has a cable core formed by covering an external circumference of a coated optical fiber or a collective coated optical fiber with a cushioning member, a tension member, and a thermoplastic resin sheath for collectively covering the cable core and the tension member, wherein the cushioning member contains a blended fiber composed of a non-water absorbent fiber and a water absorbent fiber.Type: GrantFiled: June 18, 2002Date of Patent: August 31, 2004Assignee: The Furukawa Electric Co., Ltd.Inventor: Tetsuya Yasutomi
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Patent number: 6694078Abstract: An optical fiber cable capable of absorbing water and resisting any undesirable increase of transmission loss caused by temperature variations. It has a core assembly formed by surrounding a stack of cores (1) in e.g. ribbon form by a shock absorbing member (2), at least one member (3) of high tensile strength and a sheath (4) formed from e.g. a thermoplastic resin and enclosing the core assembly and the high-tensile member (3). The shock absorbing member (2) is a strand of e.g. yarn not absorbing water, but carrying a water-absorbing resin.Type: GrantFiled: September 27, 2001Date of Patent: February 17, 2004Assignee: The Furukawa Electric Co., Ltd.Inventors: Tetsuya Yasutomi, Ichiro Kobayashi
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Publication number: 20030002829Abstract: An optical fiber cable that has a cable core formed by covering an external circumference of a coated optical fiber or a collective coated optical fiber with a cushioning member, a tension member, and a thermoplastic resin sheath for collectively covering the cable core and the tension member, wherein the cushioning member contains a blended fiber composed of a non-water absorbent fiber and a water absorbent fiber.Type: ApplicationFiled: June 18, 2002Publication date: January 2, 2003Inventor: Tetsuya Yasutomi
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Publication number: 20020031314Abstract: An optical fiber cable capable of absorbing water and resisting any undesirable increase of transmission loss caused by temperature variations. It has a core assembly formed by surrounding a stack of cores (1) in e.g. ribbon form by a shock absorbing member (2), at least one member (3) of high tensile strength and a sheath (4) formed from e.g. a thermoplastic resin and enclosing the core assembly and the high-tensile member (3). The shock absorbing member (2) is a strand of e.g. yarn not absorbing water, but carrying a water-absorbing resin.Type: ApplicationFiled: September 27, 2001Publication date: March 14, 2002Applicant: The Furukawa Electric Co., Ltd.Inventors: Tetsuya Yasutomi, Ichiro Kobayashi