Patents by Inventor Nobuhisa Ishii
Nobuhisa Ishii 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: 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: 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: 20030152350Abstract: An optical fiber unit has a core optical fiber that has a first coating layer formed on a circumference thereof, and a second coating layer formed on a circumference of the first coating layer, the first coating layer being composed of a thermoplastic elastomer, and the second coating layer being composed of a thermoplastic resin.Type: ApplicationFiled: January 14, 2002Publication date: August 14, 2003Applicant: The Furukawa Electric Co., LtdInventors: Eiji Konda, Yasuhiro Watanabe, Nobuhisa Ishii
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Patent number: 5845032Abstract: An optical fiber cable comprises a slender base body having spiral grooves formed on the outer circumferential surface, and at least one optical fiber tape housed within each of said grooves, said tape including a plurality of insulated optical fibers and a resin coating layer covering said optical fibers. The base body is formed of a mixture of at least two materials differing from each other in the molecular weight distribution. The particular construction permits markedly suppressing an increase of transmission loss derived from micro-bend occurring in the optical fiber tape arranged within the base body, and also permits arranging optical fiber tapes within the base body at a higher density.Type: GrantFiled: September 2, 1997Date of Patent: December 1, 1998Assignee: The Furukawa Electric Co., Ltd.Inventors: Eiji Konda, Nobuhisa Ishii, Ryuichi Matsuoka
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Patent number: 5751881Abstract: An optical fiber cable comprises a slender base body having spiral grooves formed on the outer circumferential surface, and at least one optical fiber tape housed within each of said grooves, said tape including a plurality of insulated optical fibers and a resin coating layer covering said optical fibers. The base body is formed of a mixture of at least two materials differing from each other in the molecular weight distribution. The particular construction permits markedly suppressing an increase of transmission loss derived from micro-bend occurring in the optical fiber tape arranged within the base body, and also permits arranging optical fiber tapes within the base body at a higher density.Type: GrantFiled: January 27, 1997Date of Patent: May 12, 1998Assignee: Furukawa Electric Co., Ltd.Inventors: Eiji Konda, Nobuhisa Ishii, Ryuichi Matsuoka
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Patent number: 5204928Abstract: In a flame-retardant coated optical fiber, which comprises an optical fiber, a primary coating layer covering the optical fiber, and a secondary coating layer covering the primary coating layer, the primary coating layer is made of an ultraviolet-curing resin, and the secondary coating layer is made of a resin composition containing 20 to 70 parts by weight of ethylene-bis-tetrabromophthalimide and 5 to 40 parts by weight of antimony trioxide, based on 100 parts by weight of thermoplastic polyester elastomer. The secondary coating layer of the coated optical fiber has high flame retardancy which is in conformity to the UL standard, and the bonding strength between the primary and secondary coating layers is high enough. Thus, a projection of the optical fiber during actual use is too small to damage a light source.Type: GrantFiled: May 26, 1992Date of Patent: April 20, 1993Assignee: The Furukawa Electric Co., Ltd.Inventors: Eizi Konda, Nobuhisa Ishii, Toru Wakita