Patents by Inventor Hideki Yagyu
Hideki Yagyu 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: 6552099Abstract: A fluororesin heated at a temperature at or above the melting point of the resin is exposed in an inert gas atmosphere having an oxygen concentration of not more than 10 Torr to an ionizing radiation at a radiation dose of 0.1 kGy to 10 MGy to prepare a crosslinked fluororesin. The crosslinked fluororesin is exposed to an ionizing radiation at a radiation dose of 10 kGy to 5 MGy, and is then brought into contact with a functional group-containing organic compound to cause a graft reaction. By virtue of this constitution, a modified fluororesin is provided which has satisfactory mechanical strength and, at the same time, has, imparted thereto, for example, ion-exchange capacity, hydrophilicity, adhesive property, or abrasion resistance.Type: GrantFiled: June 8, 2001Date of Patent: April 22, 2003Assignee: Hitachi Cable, LtdInventors: Yasuaki Yamamoto, Hiroo Kusano, Hideki Yagyu, Hajime Nishi
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Publication number: 20030008935Abstract: A fluororesin heated at a temperature at or above the melting point of the resin is exposed in an inert gas atmosphere having an oxygen concentration of not more than 10 Torr to an ionizing radiation at a radiation dose of 0.1 kGy to 10 MGy to prepare a crosslinked fluororesin. The crosslinked fluororesin is exposed to an ionizing radiation at a radiation dose of 10 kGy to 5 MGy, and is then brought into contact with a functional group-containing organic compound to cause a graft reaction. By virtue of this constitution, a modified fluororesin is provided which has satisfactory mechanical strength and, at the same time, has, imparted thereto, for example, ion-exchange capacity, hydrophilicity, adhesive property, or abrasion resistance.Type: ApplicationFiled: June 8, 2001Publication date: January 9, 2003Inventors: Yasuaki Yamamoto, Hiroo Kusano, Hideki Yagyu, Hajime Nishi
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Patent number: 6465575Abstract: A fluoroplastic-based product having reduced friction and improved abrasion resistance having excellent abrasion resistance as well as good characteristics being inherent to fluoroplastics comprises a fluoroplastic molded material containing a modified fluoroplastic prepared by applying ionizing radiation to a fluoroplastic (I) heated at the melting point or a higher temperature under an inert gas atmosphere having 10 torr or less oxygen concentration within a range of irradiation doses of from 1 KGy to 10 MGy; and an unmodified fluoroplastic (II).Type: GrantFiled: October 20, 1999Date of Patent: October 15, 2002Assignee: Hitachi Cable, Ltd.Inventors: Hiroo Kusano, Yasuaki Yamamoto, Hideki Yagyu
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Patent number: 6316846Abstract: In order to provide a cord switch which can securely catch the ON/OFF operations, can cancel an erroneous operation by preventing the contact between electrodes caused by bending of the cord switch, and have a positive sensibility for the pressurization in all directions and a high reliability, at least two wire electrodes are spirally arranged along the inner surface of an insulator which is hollowed in the cross section and comprises a restorative rubber or plastic material in the longitudinal direction in a situation where the wire electrodes are not electrically contacted each other, and the wire electrodes are fixed to the hollowed insulator in a state where the wire electrodes are projected from the insulator.Type: GrantFiled: November 19, 1999Date of Patent: November 13, 2001Assignees: Hitachi Cable, Ltd., Asmo Co., Ltd.Inventors: Shigeru Kashiwazaki, Hideki Yagyu, Koji Horii, Hidenori Ishihara, Tomoyuki Kikuta, Takeshi Tanaka
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Patent number: 6078014Abstract: In order to provide a cord switch which can reliably carry ON/OFF operations, can cancel an erroneous operation by preventing contact between electrodes caused by bending of the cord switch, and have a positive sensitivity for pressurization in all directions and high reliability, at least two wire electrodes are spirally arranged along the inner surface of an insulator which is hollowed in cross section and comprises a restorative rubber or plastic material in the longitudinal direction. The wire electrodes are not electrically contacting each other, and the wire electrodes are fixed to the hollowed insulator such that the wire electrodes are projected from the insulator.Type: GrantFiled: January 16, 1998Date of Patent: June 20, 2000Assignees: Hitachi Cable, Ltd., Asmo Co., Ltd.Inventors: Shigeru Kashiwazaki, Hideki Yagyu, Koji Horii, Hidenori Ishihara, Tomoyuki Kikuta, Takeshi Tanaka
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Patent number: 5985949Abstract: A product having reduced friction and improved abrasion resistance comprises a formed resin containing at least one fluorine-containing polymer which is exposed to an ionizing radiation. The formed resin may include from 1 to 100 weight percent of the fluorine-containing polymer in the form of powder, and from 99 to 0 percent of a high molecule polymer which is not exposed to the ionizing radiation. The fluorine-containing polymer is preferably exposed to the ionizing radiation for a total dose of from 1 KGy to 10 MGy in the absence of oxygen at a temperature not lower than the melting point of a starting fluorine-containing polymer.Type: GrantFiled: April 10, 1997Date of Patent: November 16, 1999Assignees: Japan Atomic Energy Research Institute, Hitachi Cable, Ltd., Raytech Corporation, Asahi Glass Co., Ltd.Inventors: Tadao Seguchi, Noboru Kasai, Akinari Nakayama, Hideki Yagyu, Yoneho Tabata, Kazushige Otsuhata, Shigetoshi Ikeda, Akihiro Ohshima, Mitsuharu Morozumi, Masumi Nomura
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Patent number: 5948865Abstract: In order to provide a crosslinking formed body having a low hardness and superior tensile characteristics and rubber properties, an ethylene-.alpha. olefin copolymer, polypropylene, and an organosilane compound are graft polymerized in the presence of a free radical generating agent to form a reaction product, the reaction product is formed into a desired shape formed body, and the formed body is crosslinked by being exposed to moisture in the presence of a silanol catalyst.Type: GrantFiled: October 8, 1997Date of Patent: September 7, 1999Assignee: Hitachi Cable, Ltd.Inventors: Yukio Shimazaki, Hideki Yagyu, Masahiro Suzuki, Norio Tanioka, Kenji Hirose
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Patent number: 5597981Abstract: In an unshielded twisted pair cable, a predetermined number of pairs which are twisted by a predetermined lay-length are covered by a protective sheath. Insulations for insulating conductors for the pairs and the protective sheath are wholly or partially of halogen free polymer having a low dielectric loss tangent and flame-retarding properties. The insulations have a dielectric loss tangent of less than 1.times.10.sup.-2 at 150 MHz and a 2% modulus of at least 0.3 kgf/mm.sup.2.Type: GrantFiled: March 3, 1995Date of Patent: January 28, 1997Assignee: Hitachi Cable, Ltd.Inventors: Shinji Hinoshita, Akinari Nakayama, Kiyoshi Watanabe, Hideki Yagyu, Shinya Ishi, Shigeru Iwata
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Patent number: 5420185Abstract: A bow-tie tree resistant electrical insulating composition comprises 100 parts by weight of at least one polymer selected from polyolefins and ethylene copolymers, 0.005-1.0 part by weight of a metal salt of a fatty acid containing a hydroxyl group in the molecule, and 0.005-1.0 part by weight of a fatty acid or a derivative thereof.Type: GrantFiled: September 14, 1994Date of Patent: May 30, 1995Assignee: Hitachi Cable Ltd.Inventors: Kiyoshi Watanabe, Takanori Yamazaki, Hideki Yagyu, Mamoru Kanaoka, Katsutoshi Hanawa, Chuki Ikeda
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Patent number: 5174160Abstract: This invention relates to a method or apparatus by which comparatively low-voltage electric wires and cables laid at power stations and other locations can be diagnosed for deterioration of their polymer-insulation in a non-destructive way. The method or apparatus comprises applying a torsional force to the electric wire or cable, detecting the resulting repulsion as a torque, and estimating the degree of deterioration of the polymer-insulation in the electric wire or cable on the basis of the detected value of torque.Type: GrantFiled: September 18, 1990Date of Patent: December 29, 1992Assignees: Japan Atomic Energy Research Institute, Hitachi Cable Ltd.Inventors: Yousuke Morita, Toshiaki Yagi, Waichiro Kawakami, Seiji Kamimura, Hideki Yagyu, Osamu Mochizuki, Takao Onishi
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Patent number: 4933107Abstract: An easily peelable semiconductive resin composition comprising 100 parts by weight of ethylene-vinyl acetate copolymer-based component, 1 to 20 parts by weight of waxy aliphatic hydrocarbon, and 50 parts by weight or more of furnace carbon black having an arithmetic means particle size of 25 to 40 m.mu., iodine adsorption of 4 to 60 mg/g, and DBP oil absorption (by JIS A method) of 120 to 150 ml/100 g.Type: GrantFiled: September 30, 1988Date of Patent: June 12, 1990Assignee: Hitachi Cable Ltd.Inventors: Kiyoshi Watanabe, Takanori Yamazaki, Hideki Yagyu
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Patent number: 4909960Abstract: A semiconductive resin composition comprising 100 parts by weight of a polymer component comprising an ethylene-based copolymer, an ethylene-propylene rubber, and a low molecular weight polyethylene having an average molecular weight of 1,000 to 4,000 and 40 parts by weight or more of electroconductive carbon black.Type: GrantFiled: September 27, 1988Date of Patent: March 20, 1990Assignee: Hitachi Cable Ltd.Inventors: Kiyoshi Watanabe, Toshio Shiina, Yukio Shimazaki, Hideki Yagyu, Katsutoshi Hanawa, Moritada Marumo
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Patent number: 4780695Abstract: A fire resistant refractory leakage coaxial cable assembly formed by placing a sheet of heat resistant organic film between the internal conductor and the external conductor of a leakage coaxial cable. The seam formed by the two edges of the film is positioned upwardly, so that molten insulated material will be contained by the film without flowing through the seam.Type: GrantFiled: February 11, 1987Date of Patent: October 25, 1988Assignee: Hitachi Cable Ltd.Inventors: Toru Watari, Hideaki Saito, Hideki Yagyu, Takashi Namekawa
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Patent number: 4770937Abstract: A fluorine-containing elastomeric electric insulating material is disclosed. The material is a vulcanized product of a composition comprising 100 parts by weight of a fluorine-containing elastomeric copolymer having a number average molecular weight of from 20,000 to 60,000, containing as major components a unit based on tetrafluoroethylene and a unit based on an .alpha.-olefin having 2 to 4 carbon atoms and exhibiting rubber elasticity at room temperature, 0.1 to 5 parts by weight of an organic peroxide and 0.1 to 20 parts by weight of a polyallyl compound.Type: GrantFiled: June 15, 1987Date of Patent: September 13, 1988Assignees: Hitachi Cable, Ltd., Asahi Glass Co., Ltd.Inventors: Hideki Yagyu, Ikuo Seki, Mituharu Morozumi, Yasumichi Ito, Rikichi Koike