Semiconducting Patents (Class 174/120SC)
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Patent number: 6165387Abstract: A composition for electric cables is described. The composition comprises an ethylene copolymer which includes a (poly)alkylene glycol mono(meth)acrylate of formula (I) wherein R.sub.1 =H or CH.sub.3 ; R.sub.2 =H or CH.sub.3 ; n=1-20. The composition may be used as an insulating layer or a semiconducting layer of an electric cable.Type: GrantFiled: August 2, 1999Date of Patent: December 26, 2000Assignee: Borealis A/SInventors: Bill Gustafsson, Jan-Ove Bostrom
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Patent number: 6130495Abstract: A supporting element or core stack for an electric winding, in particular for a stator of a turbogenerator, includes a supporting surface to which an electric conductor can be attached. The supporting surface is provided with a coating for corona shielding. A turbogenerator has the supporting element. A method of producing a corona shield for an electric winding disposed on a supporting element, includes providing the supporting element with a coating for corona shielding.Type: GrantFiled: November 16, 1998Date of Patent: October 10, 2000Assignee: Siemens AktiengesellschaftInventors: Michael Schulten, Ingo Thiemann
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Patent number: 6069430Abstract: The high thermoconductive insulating film 11 was formed around the outer periphery of the wound conductors 10, using the high thermoconductive insulating tape 1 comprising the mica layer 3, the reinforcement layer 5, and the high thermoconductive filler layer 7, wherein the resin content in each layer of the mica layer 3 and the high thermoconductive filler layer 7 is specified to the range of 10-25% by weight of the total weight of the material.Type: GrantFiled: February 25, 1999Date of Patent: May 30, 2000Assignee: Hitachi, Ltd.Inventors: Tomoya Tsunoda, Keiichi Morikawa, Mitsuru Onoda, Shigeo Amagi, Tatsuo Honda
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Patent number: 5917155Abstract: Electrical conductor coated with a corona-resistant, multilayer insulation system comprising first, second, and third insulation layers. The first insulation layer is disposed peripherally around the electrical conductor, the second layer is disposed peripherally around the first layer, and the third layer is disposed peripherally around the second layer. The second layer is sandwiched between the first and second layers and comprises 10 to 50 parts by weight of alumina particles dispersed in 100 parts by weight of a polymeric binder.Type: GrantFiled: February 2, 1998Date of Patent: June 29, 1999Assignee: REA Magnet Wire Company, Inc.Inventors: John E. Hake, David A. Metzler
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Patent number: 5824958Abstract: A noise-suppressing, coil-type, electrical cable which is resistant to high voltage includes an elongated core and a helically wound resistance wire. An insulation layer is provided over the resistance wire on the core. The wire has a tensile strength of at least 100 grams force, an elongation to break of at least 15%, a diameter between about 45 and 70 .mu.m, and a resistivity of approximately 10 to 50 .mu..OMEGA..multidot.cm. There are at least 7,000 turns per meter of the wire wound around the core, and the cable has a resistance value of approximately 2 to 4 .OMEGA.k/m. Cables of the foregoing type provide reduced resistance and maintain their ability to suppress noise.Type: GrantFiled: September 25, 1996Date of Patent: October 20, 1998Assignee: Sumitomo Wiring Systems, Ltd.Inventors: Makoto Higashikozono, Hiroshi Inoue
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Patent number: 5661266Abstract: An engine ignition cable includes a stretching resistant central core over which an intermediate layer made of a mixture of silicone with ferric oxide powders with a ratio of 4:1 is fit. A high conductivity wire is then wrapped around the intermediate layer, preferably in a helix form, to provide a low impedance current path having an impedance of 0.8 k.OMEGA. per meter length. An insulation outer layer or sheath which may be made of silicone or rubber, is then used to enclose the cable. The use of the high conductivity wire causes a strong electro-magnetic radiation when in operation which can be counteracted, at least partially, by the magnetic field established by the intermediate layer that consists of ferric oxide powders.Type: GrantFiled: April 28, 1995Date of Patent: August 26, 1997Inventor: Po-Wen Chang
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Patent number: 5612510Abstract: The present invention features a high-voltage, high-temperature cable article for use with electric motors, coils, transformers, generators and power supplies. The cable article has a conductive core member overlaid with an intermediate, semiconductive layer and an outer, insulative jacket layer. The intermediate, semiconductive layer can be a carbon-impregnated polymer such as a carbon-impregnated polyethylene; a carbon-impregnated, ethylene-propylene-diene terpolymer (EPDM); semiconductive nylon tape; semiconductive PTFE (polytetrafluoroethylene) tape; semiconductive fabric tape; or a semiconductive extruded fluorocarbon. The temperature rating of the cable article is at least approximately 150.degree. C.; the voltage rating can be in a range of approximately between 1,000 to 15,000 volts. The wall thickness of the semiconductive layer can range from approximately 2 to 20 mils. The outer, insulative jacket layer can be a cross-linked polyolefin, an elastomeric or a thermoplastic elastomer material.Type: GrantFiled: October 11, 1994Date of Patent: March 18, 1997Assignee: Champlain Cable CorporationInventor: Nelson Hildreth
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Patent number: 5576514Abstract: In order to provide a coil type high-voltage resistive wire having a lower resistance than and a noise preventing performance similar to a prior art resistive wire while maintaining an inductance level without increasing a diameter and a winding pitch of a resistance wire, a core (3) consists essentially of a center reinforcing core (1) which is obtained by twisting three aramid fibers of 1000 denier and a ferrite core (2) having an outer diameter of 1.3 mm or smaller which is obtained by extruding a mixture of resin or rubber base and ferrite powder around the center reinforcing core (1). A resistance wire 5 made of a copper-nickel alloy wire having a diameter of 35 to 55 .mu.m and an electrical resistivity of 5 to 35 .mu..OMEGA..cm is wound around the core 3 at a pitch of 10000 winds/m or larger in a direction normal to the longitudinal axis of the core (3), so that the resistance value of the resistance wire (5) as a conductor can be set at 4 to 7 k.OMEGA./m.Type: GrantFiled: April 11, 1995Date of Patent: November 19, 1996Assignee: Sumitomo Wiring Systems, Ltd.Inventors: Terutsugu Fujimoto, Makoto Higashikozono, Hiroshi Inoue
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Patent number: 5556697Abstract: Vulcanizable semiconductive shield compositions contain a linear, single-site catalyzed polymer formed by polymerizing ethylene with at least one comonomer selected from C.sub.3 to C.sub.20 alpha-olefins; a carbon black selected from furnace carbon blacks that contain ash and sulfur in amounts of 50 ppm or less and have crystal dimensions L.sub.a and L.sub.c of 30 .ANG. or less, acetylene carbon blacks, and furnace carbon blacks having an ASTM grade of N-351; and a crosslinking agent. The compositions may be used to manufacture semiconductive shields for electrical conductors, such as power cables. The semiconductive shields exhibit improved processability, low water vapor transmission and low shrinkback, without abrading or corroding extrusion equipment.Type: GrantFiled: March 24, 1994Date of Patent: September 17, 1996Assignee: BICC Cables CorporationInventor: Cindy L. Flenniken
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Patent number: 5545853Abstract: The present invention features a surge-protected cable for use in the wire leads and wire-wound stators of electrical motors. The cable of the invention is of the "filter line" type. This invention reduces failures in the stator windings of variable frequency drive (VFD) motors by attenuating peak voltages and transient voltage spikes. The "filter line" type of cable insulation prevents "dirty" power from unabated travel along the axis. This invention's type of filter line cable features a core member of one or more strands of conductive material overlaid with a primary insulation layer containing ferrites and/or magnetites; this layer is then further overlaid with a flame-retardant insulation jacket layer made of high-temperature material. Both the primary insulation and the outer jacket layer are cross-linked.Type: GrantFiled: July 19, 1993Date of Patent: August 13, 1996Assignee: Champlain Cable CorporationInventor: Nelson Hildreth
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Patent number: 5530206Abstract: A coaxial cable intended to be used in the field of telecommunications comprises a metal core surrounded by at least two layers one of which is a dielectric material layer and the other of which, disposed between the core and the dielectric material layer over at least part of the length of the cable, is a semiconductor composite material layer comprising an insulative matrix and an undoped polymeric conductor containing conjugate bonds. The cable features intrinsic filtering of electromagnetic interference conducted by the cable at frequencies below 1 GHz.Type: GrantFiled: May 9, 1994Date of Patent: June 25, 1996Assignee: Alcatel CableInventors: Lydie Robert, Frederic Heliodore, Stanislas Galaj, Alain Le Mehaute
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Patent number: 5481070Abstract: A DC OF cable has its main insulation composed of a composite insulation tape comprising a low dielectric loss film and kraft paper (PPLP). 1-10 sheets of kraft paper are wound on the PPLP main insulation as a layer on the inside and/or the outside thereof.Type: GrantFiled: February 25, 1994Date of Patent: January 2, 1996Assignee: Sumitomo Electric Industries, Ltd.Inventors: Masayuki Hirose, Ryosuke Hata, Yoshiteru Nakaura
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Patent number: 5460886Abstract: A DC high-voltage wire comprising: a conductor; a resin composition layer coating the conductor, the resin composition layer comprising a polyolefin resin containing carbon black in an amount of not less than 10 parts by weight per 100 parts by weight of the polyolefin resin, having an insulation resistance of not more than 10.sup.10 .OMEGA..cndot.cm; an insulating layer coating the resin composition layer, the insulation layer comprising polyethylene having a softening temperature of not lower than 105.degree. C.; and a fire retardant protective coating layer coating the insulating layer, the fire retardant protective coating layer comprising (1) a terpolymer of ethylene, vinyl acetate and vinyl chloride, and/or a terpolymer of ethylene, methyl methacrylate and vinyl chloride, and (2) a copolymer of chlorinated ethylene and vinyl chloride; the resin composition layer, the insulating layer and the fire retardant protective coating layer each being crosslinked.Type: GrantFiled: December 14, 1989Date of Patent: October 24, 1995Assignee: Sumitomo Electric Industries, Ltd.Inventors: Keiji Ueno, Tomizo Yano, Ikujiro Uda
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Patent number: 5438474Abstract: There is disclosed a tubular protective sheath for containing a power transmission conduit, the sheath comprising: first and second flexible elements each helically arranged to form respective inner and outer tubular members. The first element is in the form of a first electrically insulating film having respective first and second layers of electrically conductive low melt material adherent to its opposite surfaces. The second element is in the form of a second electrically insulating film having a third layer of electrically conductive low melt material adherent to one surface.Type: GrantFiled: June 24, 1994Date of Patent: August 1, 1995Assignee: W. L. Gore & Associates (UK) Ltd.Inventors: Hugh MacPherson, David McNaughton, Neal Croxford, Christopher F. Parsons
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Patent number: 5397860Abstract: A failure-resistant electrical ignition system cable comprises first and second terminal contacts for contacting a source of ignition pulses and contacting the predetermined destination of these pulses, respectively; a plurality of flexible ignition conductors connected between the first and second terminal contacts, each of the ignition conductors being capable of electrically communicating the ignition pulses between the terminal contacts, each of the ignition conductors comprising an electrically-inert center, an elongated conductive wire spirally and interstitially wound around the center for substantially the full length thereof, each of the ignition conductors then being twisted about each other so as to provide repeated electrical contacts of the conductive wire of each whereby electrical continuity between the terminal contacts may be maintained despite the occurrence of one or more electrical discontinuities; the outer exposed surfaces of the twisted ignition conductors being electrically insulated bType: GrantFiled: October 29, 1993Date of Patent: March 14, 1995Assignee: SplitFire, Inc.Inventors: Edwin L. Yochum, Richard H. Olson
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Patent number: 5397855Abstract: The cable includes a conductive coating layer disposed on an internal dielectric and surrounded by a conductive screen. The cable is characterized in that said conductive coating is a conductive silicone coating and in that the dielectric is treated and therefore has an adapted surface tension value greater than a value typically in current use, therefore directly giving said silicone coating layer a small level of adherence to said treated dielectric and thereby rendering it peelable.Applicable to cables having operating temperatures of the order of 250.degree. C. and high noise immunity.Type: GrantFiled: September 8, 1993Date of Patent: March 14, 1995Assignee: FilotexInventor: Jean-Pierre Ferlier
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Patent number: 5339038Abstract: An assembly for protecting a conduit having a core and an axial length, which length is susceptible to being pinched by a structure is disclosed. The conduit includes an insulating coating in surrounding relationship about the core, with the assembly including a semiconductive layer in surrounding relationship about the insulating coating, and a switching layer in surrounding relationship about the semiconductive layer. The semiconductive layer being formed from partially vulcanized ethylene propylene rubber including particles of a conductive element in the form of carbon black, silver, nickel, aluminum or the like. The switching layer is non-conductive in its unstressed state and conductive when pinched such that the switching layer completes a current flow path between the semiconductive layer and either a grounded structure or another conductive layer, which condition may then be detected.Type: GrantFiled: July 6, 1992Date of Patent: August 16, 1994Assignee: Westinghouse Electric CorporationInventors: Robert A. Boenning, Karl F. Schoch, Jr., Daryl V. Stough, Francis W. Navish, Jr.
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Patent number: 5331606Abstract: Doping the jacket of a data cable reduces the bulk volume resistivity of the jacket material allowing built-up static electricity to discharge. This reduces the likelihood of static charge interfering with data transmission.Type: GrantFiled: May 29, 1992Date of Patent: July 19, 1994Assignee: Western Atlas International, Inc.Inventor: James A. Sackett
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Patent number: 5300733Abstract: A water impervious rubber or plastic insulated power cable, which is capable of maintaining water imperviousness for an extended period of time, is provided, which power cable comprising: a cable core having a conductor, an extruded conductor shield, a rubber or plastic insulation layer and an extruded insulation shield, the last three members being sequentially formed around the conductor; a water impervious layer which is provided around the cable core and which includes a laminate tape comprising a metal foil and a plastic laminated on at least one surface of the metal foil; an extruded jacket layer which is extruded on the water impervious layer and which is made integral with the plastic of the water impervious layer; a metal shield layer which is provided around the extruded jacket layer and which includes metallic wires; and a corrosion-protective layer which is extruded on the metal shield layer and in which the metal shield layer is embedded.Type: GrantFiled: November 30, 1992Date of Patent: April 5, 1994Assignee: The Furukawa Electric Co., Ltd.Inventor: Tadayuki Uematsu
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Patent number: 5281757Abstract: An electrical power cable with a stranded conductor, a semi-conductive stress control layer around the conductor, a layer of insulation around the stress control layer, a semi-conductive insulation shield layer around the layer of insulation, an imperforate metal strip with overlapping edge portions around the shield layer and a polymeric jacket around the metal strip. The strip is free to move with respect to the jacket and the shield layer with expansion and contraction of the cable elements with temperature changes, and the overlapping edge portions of the strip are bonded together by an adhesive which permits the edge portions to move relative to each other with such temperature changes without creating fluid passageways between the edge portions. A cushioning layer can be between the shield layer and the strip and preferably, the cable is water sealed.Type: GrantFiled: August 25, 1992Date of Patent: January 25, 1994Assignee: Pirelli Cable CorporationInventors: Carlo Marin, Fabrizio Marciano-Agostinelli, Paul K. dePratter, Frank L. Kuchta
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Patent number: 5231249Abstract: There is provided an olefin resin composition for power cables which contains an olefin resin and m-(tert-butylperoxyisopropyl)-isopropylbenzene and/or p-(tert-butylperoxyisopropyl)-isopropylbenzene. A crosslinking agent of this resin composition is suitably used for at least one of layers including semiconductor layers and an insulation layer in the power cables or around conductors at a joint between the power cables, whereby the high-temperature properties of the power cables can be improved.Type: GrantFiled: October 17, 1991Date of Patent: July 27, 1993Assignee: The Furukawa Electric Co., Ltd.Inventors: Hitoshi Kimura, Tetsuo Matsumoto, Michihiro Shimada
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Patent number: 5175396Abstract: A wall structure for insulating the exterior surface of a high voltage coil having Roebeled windings is provided that comprises an inner insulating layer formed from a hardenable epoxy material for surrounding the coil and filling void spaces on the surface of the coil created by the Roebeled windings, a ground wall layer surrounding the inner layer for grounding the wall structure, and a semiconductive layer formed from a carbon filled epoxy material integrally molded around the outer surface of the inner insulating layer for reducing the electric stress across the insulating layer and in particular across any voids remaining after the insulative layer has been applied over the Roebeled windings on the exterior of the coil. The improved wall structure advantageously increases the lifespan of high voltage coils by reducing the electric stress across the inner moulding layer, thereby reducing the probability that damaging electric arcing will ever occur in any void spaces present in this layer.Type: GrantFiled: December 14, 1990Date of Patent: December 29, 1992Assignee: Westinghouse Electric Corp.Inventors: Franklin T. Emery, Leonard B. Simmonds
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Patent number: 5151143Abstract: In the manufacture of a cable core comprising a moisture-impermeable multi-wire conductor, the conductor is stranded in a conventional manner and, after a fluid-impermeable layer of plastics material has been extruded over the conductor to form the core, the core is wound around the hub of a cable drum in such a way that each end of the wound core is exposed and accessible. One exposed end of the wound core is sealed and air is evacuated from the conductor interstices by a vacuum pump cemented to the other exposed end of the wound core. A source of semi-conductive moisture-impermeable compound in a liquid or semi-liquid state is then connected to the exposed end of the wound core and moisture-impermeable compound is drawn into and flows along the evacuated conductor interstices until the interstices are filled throughout the length of the core. The moisture-impermeable compound in the interstices is then permitted to solidify or thicken to such an extent that it will not readily flow from the conductor.Type: GrantFiled: May 22, 1991Date of Patent: September 29, 1992Assignee: Bicc plcInventor: Ian Downie
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Patent number: 5095175Abstract: A water-tight rubber or plastic insulated cable includes water-tight compound which is injected into apertures among stranded wires for a conductor. The stranded conductor is compressed to have a solidity factor of 85 to 95% of the conductor. The water-tight compound is injected into the apertures among the stranded wires except for an outermost surface of the conductor. The water-tight compound has a scorch time of more than 20 minutes under a temperature of 130.degree. C. and includes conductive carbon of 50 to 60 weight %.Type: GrantFiled: April 24, 1991Date of Patent: March 10, 1992Assignee: Hitachi Cable, Ltd.Inventors: Fumio Yoshida, Katsuyuki Isaka, Susumu Koishihara, Tsutomu Tanji
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Patent number: 5066881Abstract: A semi-conducting pyrolyzed glass fiber layer equalizes the electrical potential on the exterior surface of an insulated conductor when the layer covers the surface. The layer prohibits the development of a corona discharge and bleeds off any electrical charge developed thereon when the layer is electrically coupled to a body having a known potential. The insulated conductor may be windings in a dynamoelectric machine.Type: GrantFiled: July 23, 1990Date of Patent: November 19, 1991Assignee: General Electric CompanyInventors: Richard K. Elton, William R. Schultz, Jr.
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Patent number: 5036165Abstract: A semi-conducting pyrolyzed glass fiber layer equalizes the electrical potential on the exterior surface of an insulated conductor when the layer covers the surface. The layer prohibits the development of a corona discharge and bleeds off any electrical charge developed thereon when the layer is electrically coupled to a body having a known potential. The insulated conductor may be windings in a dynamoelectric machine.Type: GrantFiled: July 23, 1990Date of Patent: July 30, 1991Assignee: General Electric Co.Inventors: Richard K. Elton, William R. Schultz, Jr.
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Patent number: 5034719Abstract: An ignition cable having a layer of semi-conductive cross-linkable polyolefin extruded over a nonmetallic strength member to form a conductive core. An insulating layer is extruded over the conductive core and overlaid with a braid of glass yarn. A final layer of insulating material is applied over the braid of glass yarn to provide an external jacket. In an alternate embodiment, the braid of glass yarn is omitted.Type: GrantFiled: April 4, 1989Date of Patent: July 23, 1991Assignee: Prestolite Wire CorporationInventors: Karl M. Brown, Bruce D. Balcerski
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Patent number: 5012125Abstract: A current carrying wire is provided with a tubular shield construction which essentially covers the wire with conductive material, and preferably emulates a classical Faraday shield. The shield is formed of a multiplicity of insulated shield wires for minimized eddy current loss. When such a shielded wire construction is formed into a primary winding of a power transformer for a switching power supply, the secondary circuit is protected from electric shock hazards while enabling use of a gap free toroidal core for close coupling between primary and secondary windings. In another embodiment, such shields are used on both the primary and secondary windings of a matching transformer and are arranged for common mode rejection of noise associated with low power data signals.Type: GrantFiled: June 3, 1987Date of Patent: April 30, 1991Assignee: Norand CorporationInventor: David W. Conway
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Patent number: 5008488Abstract: In the present invention, the strip cable is provided on its periphery with the conductive layer. The conductive layer is formed by placing the conductive coat containing the carbon fiber as a conductive filler. The strip cable is thus protected from electromagnetic waves. Since the strip cable fails to function as an antenna, the electronic equipment connected to the strip cable does not require a shielding material. By using the strip cable provided with an electromagnetic-shielding effect, electromagnetic waves can be avoided easily and inexpensively. In addition, the varieties of design can be allowed for the electronic equipment.Type: GrantFiled: December 1, 1989Date of Patent: April 16, 1991Assignee: Kitagawa Industries Co., Ltd.Inventor: Asaharu Nakagawa
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Patent number: 4998090Abstract: An engine ignition cable in which carbon fiber is mixed with conductive rubber or synthetic resin, to provide a conductive portion in which the resistance value is readily adjusted. The conductive element of the cable is made of carbon fiber of polyacrylo nitrile type. The conductive element is coated with an electro-conductive layer comprising a mixture of polyacrylo nitrile type carbon fiber powder and conductive rubber or synthetic resin mixed in accordance with a predetermined ratio to achieve a predetermined resistance value.Type: GrantFiled: March 9, 1989Date of Patent: March 5, 1991Inventor: Hee W. Park
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Patent number: 4997995Abstract: An extra-high-voltage power cable is provided with extruded insulation 3 over a conductor 1 thereof. The insulation comprises an inner layer 5 of an unfilled high density polyethylene or polypropylene material having a higher electric strength than the material of the insulation adjacent thereto in an outer layer 6 thereof.Type: GrantFiled: October 13, 1989Date of Patent: March 5, 1991Assignee: Pirelli General plcInventors: Malcolm A. Simmons, Julian G. Head
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Patent number: 4988949Abstract: An apparatus for detecting excessive chafing of a cable arrangement against an electrically grounded structure includes a layer of semiconductive material positioned in surrounding relation with an elongated member such as an electrical cable, tube or hose. A layer of electrically insulating material surrounds the layer of semiconductive material. A detector circuit is electrically connected with a reference end portion of the semiconductive layer. The detector circuit is operable to detect at least momentary contact between the layer of semiconductive material and an electrically grounded structure due to erosion of the layer of electrically insulating material surrounding the semiconductive layer caused by excessive chafing of the layer of electrically insulating material against the ground structure.Type: GrantFiled: May 15, 1989Date of Patent: January 29, 1991Assignee: Westinghouse Electric Corp.Inventors: Robert A. Boenning, Harvey H. White, Jr.
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Patent number: 4973029Abstract: An electrically conductive wire particularly for use in fencing systems in enclosed which includes an inner metal conductor, an electrically conductive intermediate layer of plastic material applied over the conductor, and a relatively thin outer sheath applied over the intermediate layer. The thin outer sheath is preferably white to enhance the visibility of the wire, while at the same time being thin enough to permit current to pass therethrough.Type: GrantFiled: October 3, 1989Date of Patent: November 27, 1990Inventor: Edward S. Robbins, III
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Patent number: 4970488Abstract: A high voltage cable having a wound conductor made by winding a metallic wire around a ferrite rubber covered reinforcing core, in which the ferrite rubber layer is additionally provided with conductive particles or fibers in order to improve noise suppression characteristics in the 30-200 MHz frequency range.Type: GrantFiled: February 17, 1989Date of Patent: November 13, 1990Assignee: Yazaki CorporationInventors: Tsuneyuki Horiike, Toshio Inada, Masahiro Kanda
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Patent number: 4859989Abstract: A security system comprising a signal-carrying member and a detector for detecting a change in the resistance of the conductive path surrounding a core of the signal-carrying member. The conductive path comprises inner and outer layers of semi-conductive tape separated by an insulating layer but interconnected at one end. The semi-conductive tape of at least the outer layer is made of fibrous material such as carbon-leaded PTFE such that when a sharp object pierces the outer layer and the insulating layer, semi-conductive fibers are dragged from the outer layer into contact with the inner layer and form a conductive bridge between the layers.Type: GrantFiled: December 1, 1987Date of Patent: August 22, 1989Assignee: W. L. Gore & Associates, Inc.Inventor: Hugh McPherson
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Patent number: 4853565Abstract: A semi-conducting pyrolyzed glass fiber layer equalizes the electrical potential on the exterior surface of an insulated conductor when the layer covers the surface. The layer prohibits the development of a corona discharge and bleeds off any electrical charge developed thereon when the layer is electrically coupled to a body having a known potential. The insulated conductor may be windings in a dynamoelectric machine.Type: GrantFiled: August 23, 1984Date of Patent: August 1, 1989Assignee: General Electric CompanyInventors: Richard K. Elton, William R. Schultz, Jr.
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Patent number: 4818438Abstract: Disclosed are improved compositions useful in providing a conductive layer or coating on or within a conductor. The compositions contain elemental carbon and a polymeric matrix or binder. The improvement comprises employing a unique ground calcined, coal-based coke which approaches graphite in terms of its performance as a conductive additive or pigment but does not possess the disadvantages associated with the use of graphite.The unique coke employed in the compositions and methods of the present invention has a significant level of graphitic structure. This level of graphitization can be most easily recognized by utilizing x-ray powder diffraction. More specifically, when the value of E.sub.c or the inverse peak width (using the 002 peak) is measured for this material using Mo K.alpha. radiation (.lambda.=0.71 .ANG.), the value is in the range of about 27 to about 80, and preferably about 28 to about 75.Type: GrantFiled: July 19, 1985Date of Patent: April 4, 1989Assignee: Acheson Industries, Inc.Inventor: Robert E. Wiley
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Patent number: 4801766Abstract: A crosslinked polyolefin insulated power cable with remarkably improved AC breakdown voltage and impulse withstand voltage has been obtained by a process which comprises extrusion-coating, on the outer surface of a conductor, (1) a material for the formation of an inner semiconductive layer, comprising a base polymer and N-vinylcarbazole, (2) a crosslinkable polyolefin material for the formation of a crosslinked polyolefin insulating layer and (3) a material for the formation of an outer semiconductive layer in this order and then subjecting the coated conductor to a crosslinking treatment to form, on the outer surface of the conductor, an inner semiconductive layer, a crosslinked polyolefin insulating layer and an outer semiconductive layer in this order.Type: GrantFiled: October 16, 1987Date of Patent: January 31, 1989Assignee: Showa Electric Wire & Cable Co., Ltd.Inventors: Fumio Aida, Takeo Shinono, Misao Hanai, Shahrzad Tassavori
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Patent number: 4780576Abstract: An insulated electrical cable is disclosed, comprising an electrical conductor coated with an insulating layer comprising an ethylene/.alpha.-olefin copolymer having a density of from 0.89 to 0.91 and an ethylene/vinyl acetate copolymer.Type: GrantFiled: March 6, 1987Date of Patent: October 25, 1988Assignee: Sumitomo Electric Industries, Ltd.Inventor: Mineya Kuno
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Patent number: 4776665Abstract: A metal free self-bearing optical cable is provided for use as an overhead cable in the field region between phase wires of a high-tension power line. The cable core is formed of slightly electrically conductive material having series resistances of between 10.sup.5 .OMEGA. cm and 10.sup.10 .OMEGA. cm.Type: GrantFiled: July 18, 1986Date of Patent: October 11, 1988Assignee: Siemens AktiengesellschaftInventor: Ulrich Oestreich
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Patent number: 4767894Abstract: A laminated construction comprising at least three extruded layers of polymer-based material in which an intermediate layer (4) between a first layer (3) and a second layer (5) is strippably bonded to the first layer (3) and fully bonded to the second layer (5) such that the second layer together with substantially all of the intermediate layer (4) is readily strippable from the first layer (3). In particular, the invention relates to an insulated electrical cable in which such a laminated construction is arranged substantially coaxially about a core conductor (1); the first layer (3) being an inner layer of insulating material, intermediate layer (4) being either of insulating material or of a semi-coductive shielding material and the second layer (5) being an outer layer of a semi-conductive shielding material. Preferably, an additional layer of semi-condutive shielding material is positioned between the core conductor (1) and the first layer (3).Type: GrantFiled: August 6, 1986Date of Patent: August 30, 1988Assignee: BP Chemicals LimitedInventor: Jacques Schombourg
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Patent number: 4732722Abstract: A crosslinked polyolefin insulated power cable with remarkably improved AC breakdown voltage and impulse withstand voltage has been obtained by a process which comprises extrustion-coating, on the outer surface of a conductor, (1) a material for the formation of an inner semiconductive layer, comprising a base polymer and N-vinylcarbazole, (2) a crosslinkable polyolefin material for the formation of a crosslinked polyolefin insulating layer and (3) a material for the formation of an outer semiconductive layer in this order and then subjecting the coated conductor to a crosslinking treatment to form, on the outer surface of the conductor, an inner semiconductive layer, a crosslinked polyolefin insulating layer and an outer semiconductive layer in this order.Type: GrantFiled: November 14, 1985Date of Patent: March 22, 1988Assignee: Showa Electric Wire & Cable Co., Ltd.Inventors: Fumio Aida, Takeo Shiono, Misao Hanai, Shahrzad Tassavori
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Patent number: 4705647Abstract: A copper-type conductive coating composition which comprises:(A) a copper powder with hydrogen loss of at most 0.2% by weight or a copper powder with its oxidized surface layer removed by treatment with an organic carboxylic acid,(B) a coating binder resin, and(C) an antioxidant selected from triazoles represented by the formula: ##STR1## wherein Y is a hydroxyl group, a hydrogen atom, a C.sub.1 -C.sub.18 alkyl group or a halogen atom, and a is an integer of 1 to 3, and trithiophosphites represented by the formula: ##STR2## wherein each of R.sub.1 to R.sub.3 is a C.sub.1 -C.sub.30 alkyl group or an allyl group.Type: GrantFiled: June 26, 1986Date of Patent: November 10, 1987Assignee: Mitsubishi Petrochemical Co., Ltd.Inventors: Shoji Yamaguchi, Kimiko Yamada
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Patent number: 4700171Abstract: Automotive ignition wire with a high temperature rating, excellent electrical insulating properties, heat resistance, oil resistance and abrasion resistance is described. The wire utilizes a conductor made up of either a helically wound metal conductor on a radio frequency insulating polymer overcoated on a polymer adhesive layer on a glass fiber bundle; or a glass fiber-cotton fiber braid on a graphite impregnated glass layer. Overcoating either one of the conductors is a semiconducting polymer layer, an ethylene-propylene-diene monomer containing polymer layer optionally overcoated with a glass braid layer and a polymer jacket material. The polymer jacket material comprises a polymeric mixture of ethylene vinyl acetate and ethylene-propylene-diene monomer stabilized with a mixture of a phenolic antioxidant and a metal salt antioxidant.Type: GrantFiled: December 4, 1986Date of Patent: October 13, 1987Assignee: United Technologies CorporationInventors: Ronald J. Coffey, Christo M. Wassouf
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Patent number: 4689601Abstract: Automotive ignition wire with a high temperature rating, excellent electrical insulating properties, heat resistance, oil resistance and abrasion resistance is described. The wire utilizes a conductor made up of either a helically wound metal conductor on a radio frequency insulating polymer overcoated on a polymer adhesive layer on a glass fiber bundle; or a glass fiber-cotton fiber braid on a graphite impregnated glass layer. Overcoating either one of the conductors is a semiconducting polymer layer, and a polymer jacket material. The polymer jacket material comprises a polymeric mixture of ethylene vinyl acetate and ethylene-propylene-diene monomer stabilized with a mixture of a phenolic antioxidant and a metal salt antioxidant.Type: GrantFiled: August 25, 1986Date of Patent: August 25, 1987Assignee: Essex Group, Inc.Inventors: Ronald J. Coffey, Christo M. Wassouf
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Patent number: 4663079Abstract: A copper-type conductive coating composition which comprises:(A) a copper powder with hydrogen loss of at most 0.2% by weight or a copper powder with its oxidized surface layer removed by treatment with an organic carboxylic acid,(B) a coating binder resin, and(C) an antioxidant selected from triazoles represented by the formula: ##STR1## wherein Y is a hydroxyl group, a hydrogen atom, a C.sub.1 -C.sub.18 alkyl group or a halogen atom, and a is an integer of 1 to 3, and trithiophosphites represented by the formula: ##STR2## wherein each of R.sub.1 to R.sub.3 is a C.sub.1 -C.sub.30 alkyl group or an allyl group.Type: GrantFiled: June 27, 1985Date of Patent: May 5, 1987Assignee: Mitsubishi Petrochemical Co., Ltd.Inventors: Shoji Yamaguchi, Kimiko Yamada
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Patent number: 4595792Abstract: A method for detecting faults in a synthetic electro-mechanical cable uses n insulated conductor dipped in a slurry of graphite prior to being overbraided with the synthetic reinforcement material. Enough graphite oozes through the braid to insure a conductive path through the multiple layers of cable on a metal take-up reel to megger the finished cable between the conductor and the metal reel.Type: GrantFiled: April 1, 1983Date of Patent: June 17, 1986Assignee: The United States of America as represented by the Secretary of the NavyInventor: Richard C. Swenson
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Patent number: 4588855Abstract: A semiconducting composition comprising(A) a random copolymer of propylene and an alpha-olefin having at least 4 carbon atoms as main constituents, which contains 50 to 87 mole % of the propylene units,(B) fine particles of carbon black, and as an optional component,(C) at least one random copolymer selected from the group consisting of a random copolymer of ethylene and a vinyl ester having 4 or 5 carbon atoms as main constituents, which contains at least about 5.4 mole % of the vinyl ester units, and a random copolymer of ethylene and an unsaturated carboxylic acid ester having 4 to 8 carbon atoms as main constituents, which contains at least 3 mole % of the unsaturated carboxylic acid ester units.The semiconducting composition or its crosslinked product is useful as an outside semiconducting layer in a power cable composed at least of a central conductor, a crosslinked polyethylene insulating layer surrounding the conductor and an outside semiconducting layer surrounding the insulating layer.Type: GrantFiled: April 15, 1985Date of Patent: May 13, 1986Assignee: DuPont-Mitsui Polychemicals Co., Ltd.Inventors: Yoshikazu Kutsuwa, Kouji Kitahara, Toshiyuki Ishii
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Patent number: 4584431Abstract: A high voltage coaxial cable wherein a corona-free configuration is produced by applying a room temperature-curable silicone elastomeric material under pressure to the outer surface of the cable braid so that the material is forced between the voids of the braid and adheres to the primary insulation material at the insulation/braid interface.Type: GrantFiled: October 11, 1984Date of Patent: April 22, 1986Inventors: Robert J. Tippie, Anthony T. Nasuta, Jr.
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Patent number: RE36307Abstract: An electrical power cable with a stranded conductor, a semi-conductive stress control layer around the conductor, a layer of insulation around the stress control layer, a semi-conductive insulation shield laser around the layer of insulation, an imperforate metal strip with overlapping edge portions around the shield layer and a polymeric jacket around the metal strip. The strip is free to move with respect to the jacket and the shield layer with expansion and contraction of the cable elements with temperature changes, and the overlapping edge portions of the strip are bonded together by an adhesive which permits the edge portions to move relative to each other with such temperature changes without creating fluid passageways between the edge portions. A cushioning layer can be between the shield layer and the strip and preferably, the cable is water sealed.Type: GrantFiled: September 1, 1995Date of Patent: September 21, 1999Assignee: Pirelli Cable CorporationInventors: Carlo Marin, Fabrizio Marciano-Agostinelli, Paul K. dePratter, Frank L. Kuchta