Abstract: An electrically insulated wire which has an electrical conductor formed of a base material having an outer conductor surface and a chromium oxide containing layer formed on the outer conductor surface. An electrically insulating nitride layer is provided on the chromium oxide containing layer. The electrically insulated wire has a high insulability at high-temperatures, an excellent flexibility and does not form a gas adsorption source.

Abstract: An insulated wire has a conductor, a first insulating metal oxide layer which is formed around the conductor, and a second insulating metal oxide layer, containing ceramic particles mixed by addition and formed around the first insulating metal oxide layer. The so formed insulating metal oxide layers are produced by changing a precursor of a metal oxide into the ceramic state. This change is caused by a method such as a sol-gel method or a thermal decomposition method. The mixed ceramic particles are more preferably in the form of fine platelets. This insulated wire has an excellent flexibility, emits no gas, can maintain its insulation even at a high temperature, and has a high breakdown voltage.

Abstract: 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.

Abstract: A bundled conductor manufactured by bundling a plurality of small diameter conductors 1, or a bundled conductor 2 manufactured by giving an extremely rough twisting pitch, which is 20 times or more larger than an outer diameter of said bundled conductor, to the bundled conductor is formed. Then, an insulating layer 3 comprising 3 layers 3a, 3b and 3c, each comprising a heat-resistant plastic film, is arranged around the bundled conductor above. A required voltage resistance characteristics is provided and maintained by any 2 of the aforesaid 3 insulating layers, and each of the 3 insulating layers described above is independent respectively and can be separated from other ones.

Abstract: A transformer is disclosed which has a primary and a secondary winding disposed concentrically around a core via a flanged bobbin. Each winding has a conductor wire which is doubly or, preferably, triply sheathed with insulating tapes of different widths. The first or inmost insulating tape is wound overlappingly in a first direction around the conductor wire without being bonded thereto. The second or intermediate insulating tape, less in width than the first, is wound overlappingly in a second direction, opposite to the first direction, over the first insulating tape and bonded thereto via a preformed adhesive layer on the second insulating tape. The third or outmost insulating tape, still less in width than the second, is wound overlappingly in the first direction over the second insulating tape and bonded thereto via a preformed adhesive layer on the third insulating tape. The ratio of the overlap of each tape to the tape width becomes progressively less from the inmost toward the outmost tape.

Abstract: The present invention features a new lead wire for use with class F motors, coils and transformers. The new motor lead wire has the UL-required temperature rating of at least 150.degree. C. and a voltage rating of approximately 600 volts. The lead wire is characterized by a thinner and less costly insulative construction. The motor lead wire has a conductive core member that is overcoated with a primary insulation layer of polyolefin. The polyolefin layer is of a reduced thickness, generally below the standard 30 mils. The polyolefin insulation thickness can be reduced by half, to about 15 mils. This reduced insulation layer is then protected with a jacket of polyvinylidene fluoride or a polyvinylidene fluoride copolymer having an approximate maximum thickness of 0.005 inches. The primary insulation is cross-linked and stabilized with zinc salt of methylmercaptobenzimidazole and a hindered phenol oxidant.

Abstract: An insulated conductor (20) for use in a communication cable which includes a filling material (30) includes a copper conductor (25) and a composite insulation system (27) comprising two concentric layers of insulation. An inner foam layer (28) of the insulation comprises a cellular plastic material (28) which includes a stabilizer system. An outer layer (29) of the insulation is referred to as a skin and comprises a stabilized solid plastic material. The stabilizer system in each of the cellular and solid layers includes a bifunctional portion that functions as an antioxidant and as a metal deactivator and that has a relatively high resistance to extraction. The level of the bifunctional portion of the stabilizer in the cellular material is substantially greater than that in the skin inasmuch as it has been found that the level of the stabilizer cellular layer contiguous to the copper wire determines the oxidation performance level of the composite insulation.

Abstract: A polyurethane magnet wire comprising a conductor having provided thereon a polyurethane insulation coating, wherein the total amount of the phenolic compounds contained in organic compounds which evaporate from said coating by heating at 280.degree. C. for 2 minutes is 0.2 wt % or less based on the weight of the coating and the total amount of the organic compounds is 2 wt % or less based on the weight of the coating; and an electric relay comprising such a wire.

Abstract: A hermetic lead wire having an extruded chlorosulfonated polyethylene insulation wherein the insulation also contains an acid acceptor, filler and peroxide cross-linking agent. The insulation composition and a method of preparing the insulation composition by first blending the chlorosulfonated polyethylene with the acid acceptor and then adding a filler and peroxide cross-linking agent.

Abstract: An insulated conductor having improved arc propagation resistant properties. The insulation consists of a first layer of a composite tape of polyimide between two layers of polytetrafluoroethylene. The second overlaying tape layer is unsintered polytetrafluoroethylene. Further disclosed is a process for manufacturing a sintered wire product having a tin plated electrical conductor.

Abstract: An elongate body insulated by means of an insulating covering, said covering being constituted by a tape (2) made of synthetic material taped around said body (1) and covered in a layer of varnish (11) made of synthetic material, the body being characterized in that the taping is such that there exists a groove (4) between the free edge (5) of any portion of a turn (3) that is not covered by the following turns and the uncovered surface (6) of the preceding turn, the width of said groove (4) lying substantially in the range 0% to 5% of the width of said tape (2) and being strictly greater than zero.

Abstract: A crush-resistant high signal propagation velocity coaxial cable insulated with a low-density expanded PTFE insulation surrounded by an extruded closed-cell polymer foam.

Abstract: A polyol-water mixture is applied over the polymeric insulation of the or each conductor core of an electrical cable prior to extruding the polymeric sheath of the cable thereover such that the polymeric sheath is prevented from adhering to the polymeric insulation.

Abstract: A structure for an electrical cable which may be used as a high-frequency signal transmission line and which includes a jacket which is highly permeable by fluids to reduce the time required for stabilization of impedance and transmission speed of the cable upon placement into an environment characterized by a fluid dielectric having a different dielectric constant. The permeable jacket also facilitates electrical connection to a shield conductor of the transmission line, exposed through apertures in the jacket, by use of electrically conductive potting materials, and without the need to remove any portions of the jacket surrounding the shield conductor to which electrical connection is to be made.

Abstract: An abrasion- and termite-resistant cable comprises at least one elongate functional element coated with at least two concentric layers of polymeric material, the exterior layer being a polyamide and the layer adjacent thereto being an essentially olefin polymer which comprises from 0.001 to 30% by weight of polar monomer selected from unsaturated acids and acid anhydrides. Other monomers and properly-modifying polymers may also be present in the olefin polymer. These layers are applied in a single operation wherein at least one of the polymeric materials is in a fluid state when the materials are contacted.The invention permits the construction of a cable with an unusally thin polyamide layer. It also permits the extrusion of the layers on an aluminium-sheathed functional element without the need for an adhesion-promoting layer on the aluminium.

Abstract: A cable which may be used in buildings in concealed areas such as in plenums or in riser shafts includes a core (22) which includes at least one transmission medium each of which is enclosed with a non-halogenated plastic composition of matter. The core is enclosed with a jacket (28) which also is made of a non-halogenated plastic composition. The non-halogenated plastic material of the insulation includes a polyetherimide constituent and an additive system. The additive system includes an antioxidant/thermal stabilizer and a synergistic metal deactivator and may include a lubricant. For the jacket, the plastic material is a composition which may include a siloxane/polyimide copolymer constituent blended with a polyetherimide constituent and an additive system to improve processing and long term aging, or a siloxane/polyimide copolymer constituent with a flame retardant system.

Abstract: Coaxial electric cable and simplified process for making it, wherein large gauge center conductor is wrapped with extruded strands of porous expanded polytetrafluoroethylene, drawn through a die to reduce diameter and voids, tape-wrapped with porous expanded polytetrafluoroethylene, sintered, and shielding and extruded jacketing applied.

Abstract: A high-tension resistance cable capable of maintaining a distributed capacitance not greater than 80 pF/m while having an outer diameter not greater than 5 mm includes a central resistance conductor which is no more than 0.8 mm in diameter. In one embodiment, the resistance is formed of a reinforcement core, a ferrite core layer, and a metal winding layer. In the metal winding layer, wires, having an outer diameter of 0.04 to 0.045 mm, are wound at a density of 91-115 times per centimeter around the ferrite core layer.

Abstract: An insulation system and method utilizes multiple helically wound insulating tape windings wound on a wire. Each individual insulating tape winding is wound so that each wrap overlaps a specified area of the preceding wrap of the winding.

Abstract: Magnet wire substrates (1) are described having a layer of polyester tape (2) wrapped thereon, including a layer of spirally wrapped and bonded polyester insulation tape (3) as the outermost layer. The two tape layers are made up of amorphous (4) and crystalline (5) segments unbonded to the wire and bonded to each other to provide the requisite electrical properties and improved physical properties including increased flexibility and ease of strippability. A single multilayer polyester insulation tape can also be used with similar properties and reduced thickness.

Abstract: An optical fiber is surrounded by a protective cladding of a liquid crystal material and fabricated by passing the optical fiber through a die member which operates to deposit relatively thin individual high-strength layers built up to a desired thickness. In another embodiment, the desired thickness is achieved by surrounding the optical fiber or fibers with a plurality of individual high-strength strands of liquid crystal polymer collectively compressed about the optical fiber(s).

Abstract: A high-Z cable sheathing for shielding against ionic radiation includes tubes made of high-Z material having continuous helical slits extending from end to end of each tube. A helically cut tube made of polyethelene and lead provides a highly flexible sheath for surrounding one or more cables. One or more tubes create the layers of protection over the cable. Oppositely cut helically slit tubes are used adjacent to one another so that the slits of adjacent tubes do not become mechanically aligned with one another.

Abstract: A process for electrodepositing mica and a water soluble anionic resin binder, such as a modified polyester resin, is disclosed as a means for applying a heavy coating of a high-voltage, mica-bearing electrical insulation onto uninsulated and porous mica tape-insulated portions of electrical connections in dynamoelectric machines. The electrodeposited mica coating is subsequently impregnated with a suitable resin, such as an epoxy or polyester resin, concurrently with the impregnation of other conventional insulations in the machine. Alternatively, deposition and impregnation of the connection insulation can be performed prior to installing the connection into the machine.

Abstract: This invention relates to the use of ethylene/tetrafluoroethylene (ETFE) or ethylene/chlorotrifluoroethylene (ECTFE) polymers to produce a foamed coating of insulation over wire and used as wire pairs for transmitting electronic signals, in which the foamed coating is surrounded by a protective jacket or skin made of one of the two polymers.

Abstract: An electrical transmission line of the twisted pair of coaxial cable type is provided. One line has a center conductor, a porous plastic dielectric disposed around the outer periphery of the conductor, the dielectric having specific gravity of 0.5 or less, and having a plastic dielectric sheath disposed around the outer periphery of the porous dielectric, the outer sheath having a melting temperature which is 60% or less than the melting temperature of the porous plastic dielectric. The porous plastic dielectric may be in tape form helically wrapped around the conductor, preferably at a wrap angle of 20 degrees or less. The preferred porous dielectric is expanded polytetrafluoroethylene.

Abstract: An improved thermally stable, lubricious magnet wire enamel is disclosed which is particularly suitable for use as an outermost insulating, lubricating layer on a magnet wire substrate. The enamel comprises the reaction product of a tri-basic acid anhydride, a diisocyanate and a polyfunctional organosiloxane. The coating has a coefficient of friction, after application to magnet wire, of less than 0.10. It is also substantially all polyfunctional organosiloxane reacted, i.e. substantially no polyfunctional organosiloxane is capable of being extracted from the cured coating with organic solvents.

Abstract: A flexible tubing cable assembly having an outer sheath of flexible thin wall metal tubing with one or more conductors therein, each of the conductors having a first layer of a first dielectric and a second layer of a second dielectric, with a third dielectric material filling the space between the one or more conductors and the interior of the tubing. In one of several embodiments, the first dielectric is a polyimide film; the second dielectric is a layer of ethylene propylene compound; and the third dielectric is a magnesium oxide insulation. In another embodiment, the first dielectric is a polyimide; the second dielectric is fiberglass; and the third dielectric is a synthetic rubber. The tubing, in cross-section, may be circular or ovate. In addition, the tubing may be of either high tensile strength or low tensile strength, depending upon the weight supported, for instance, if a submersible pump is supported, high tensile strength tubing is used.

Abstract: A low attenuation high frequency coaxial cable is provided for carrying microwave energy in the gigaHertz range. A center conductor is wrapped with a plurality of layers of low density PTFE dielectric material. At least one layer of high density unsintered PTFE dielectric material is tightly wrapped around the low density tape with overlapping edges and then is sintered for forming an envelope strong enough to hold the low density material in position during the remainder of the cable preparation and during an attaching of terminating connectors. An outer conductor of longitudinally extending, parallel, adjacent electrically conductive wire strands is applied with a slight helical lay around the dielectric of the cable along its axis thereof surrounding the high density tape. A serving may be applied over the longitudinal wire strands and a jacket applied around the cable over the serving. The cable so formed provides an improvement in performance.

Abstract: To reduce the tendency of ground faults and short circuits on electrical heating elements operating at elevated voltages and temperatures, resistance heating wire is coated with a sublayer of magnesium zirconate followed by an outer layer of aluminum oxide; each layer being in the range of 0.001 to 0.010 inches thick.

Abstract: In order to improve the mechanical strength of power and control cables which are subjected to high mechanical stresses in operation, the conductors are elastically fixed to a structural element of the cable. To this end, the conductor insulation is joined in a material-bonded manner to the structural element which consists of a soft elastomer. The conductors are provided, for instance, with a thin cover layer of polyethylene which can be cross-linked peroxidically and is cross-linked after the inner jacket is applied, and in the process makes a material-bonded connection to the inner jacket which consists of a vulcanizable mixture of ethylene-propylene rubber and natural rubber.

Abstract: A cable, which is resistant to gnawing animals, includes a cable jacket surrounding cable parts such as optical waveguides and having an outer layer or jacket of a gnaw resistant material which is applied in a soft state either prior to or during installing of the cable and is then hardened to a solid state after installation of the cable.

Abstract: A varnish suitable for spray coating on plastic insulated copper conductors restores cracked or damaged insulation. The varnish cures by reaction in air upon application to the conductors. The varnish comprises drying oil (typically, tung oil and castor oil), phenolic resin, metallic catalysts, and solvents.

Abstract: A shielded cable is provided having good electrical properties and which may be easily terminated. The cable includes an insulated conductor which is encased within a thermoplastic tape, a supported tape, and a metallic shield. The tapes are bonded together during a heating step so that any gaps or voids are eliminated by thermoplastic flow. They may also be peeled as a unit from the insulation during a terminating operation.

Abstract: A shielded wire in which an insulation layer covered wire and a ground wire are both covered with a conductive material layer. The ground wire is covered, furthermore, with a conductive high molecular material layer. The latter and the conductive material layer are in mutual contact so that they are mechanically separable from each other and are, at the same time, electrically connected to each other. The conductive high molecular material layer may be made of conductive synthetic resin such as conductive polyvinyl chloride and the like, or of conductive rubber. The conductive material layer may also be made of the latter materials, as well as of metal.

Abstract: A composition of high oxygen index that yields little visible smoke and little or no corrosive fume on combustion and having adequate mechanical and electrical properties for cable jackets and bedding comprises;20-35 parts of ethylene-vinyl acetate copolymer;52-75 parts of an alumina trihydrate with at least half its weight in particles with a diameter in the range 0.5-3.0 micrometer;up to 3 parts of stearic acid or a stearate; andat least one antioxidant and if desired at least one curing agent in effective amounts not exceeding 4 parts in all.A double-layer of aromatic polyimide tape, the first layer helically lapped and the second preferably longitudinally applied, is interposed between a bedding an a jacket both of the above composition to give a superior low-smoke cable for use in tunnels of railroads or other transportation systems.

Abstract: This invention relates to a high strength cable to electrically and mechaally connect a vessel or a base on the sea with submarine instruments. Such a cable is required to transfer a signal or electric power and to positively transfer to a tension member in the cable a drawing force which is applied to an outer sheath from a capstan when the cable is wound up or drawn out by the capstan. This invention has a feature in that layers 6A, 6B, 6C and 6D of lapping tape having a high friction coefficient such as rubber coated tape are provided between a tension member 7 and an outer sheath 8. This feature prevents a displacement between the tension member 7 and the outer sheath 8.

Abstract: A conductor bar for an electric machine is disclosed. At least one strip-like insert is provided on a surface of the conductor which forms an angle with an insulating sleeve enclosing the insert and conductor. Voids are produced at the edges of the insert which form impregnating canals for an impregnating medium to thereby improve the impregnability of the insulating sleeve.

Abstract: A torque balanced cable for towing or suspending oceanographic instrumenton includes a data transmission core about which is wound a helically laid inner layer of load bearing strands formed of high tensile strength, low stretch aramid fiber and having a selected pitch angle, pitch diameter and strand thickness. An outer composite layer is contrahelically wound about the inner layer and an interposed, abrasion resisting barrier film layer, and includes alternating load bearing strands and non-load bearing filler strands, the other load bearing strands having the same degree of pitch angle and thickness as the inner strands and of a number that bears substantially the same ratio to the number of inner strands as the pitch diameter of the inner layer bears to the pitch diameter of the outer layer.

Abstract: An electric cable and in particular a coaxial cable, said cable having at least one conductor surrounded by electrical insulation and at least one longitudinal strength member formed by a cord of aromatic polyamide fibres, disposed parallel to the conductor or twisted in a helix therearound. Various kinds of cords are described: twisted; non-twisted; in one or in several layers; embedded in insulation or constituting the insulation.

Abstract: The disclosure relates to a construction for a wrapped elongated structure, a method of manufacturing an apparatus to manufacture the wrapped elongated structure. The wrapped elongated structure has an elongated core. An adhesive tape having one adhesive surface is applied to the surface of the core along the length thereof with the adhesive surface facing away from the core. Tape wrapping is spirally wrapped around the core and the applied adhesive tape in order that each turn of the tape wrapping contacts the adhesive surface of the adhesive tape. The adhesive tape secures the tape wrapping in its spiral form with respect to the elongated core. The wrapped elongated structure may also structure may also included an elongated core, a first tape wrapping spirally wrapped around the core, an adhesive tape having two adhesive surfaces applied on the spiral first tape wrapping, and a second tape wrapping spirally wrapped around the adhesive tape.

Abstract: An electric cable assembly and method for protecting an electric cable assembly for rendering the cable repellent to rodent attacks. A non-lethal toxic chemical, such as lithium chloride, which produces lithium ions when dissolved in the saliva of an animal, is incorporated in an electric cable as either a layer within the electric cable assembly around the circumference and along the length of the cable assembly or by providing a coating on the surface of the electric cable assembly by spraying or painting thereon a mixture containing, for example, lithium chloride. A protective layer or coating may be provided around the layer or coating of the lithium ion producing chemical to protect it against moisture or other environmental conditions.

Abstract: An electrical cable having an improved graded insulation which minimizes uneven electrical stresses caused therein by a lack of a symmetrical cable structure, and a method of overcoming disproportionate electrical stresses at interfaces intermediate the sections of a graded insulation for electrical cable.

Abstract: A method of producing an insulated electrical conductor, in which a wire conductor is coated with an inner layer of heat resistant material and covered with electrostatically deposited powdered polymeric material which is fused by heat to form an outer layer of insulation. An insulated electrical conductor produced by this method comprises a core carrying an inner coating of heat resistant material and an outer coating of fused polymeric material.

Abstract: A cable for the transmission of direct current electricity comprising a multi-layered, resistivity graded polymer insulation, and a method of transmitting direct current electricity therewith.

Abstract: A flexible electrical power cable is described. The cable comprises a flexible metallic conductor and a plurality of alternately wrapped insulating layers comprising (1) at least two spirally wound layers of a tape made from mica paper and from a sheet of fibers which are resistant to temperatures up to at least 300.degree. C, the tape being impregnated with an adhesive silicon resin and (2) a layer of temperature-resistant plastic film or sheeting which is stable to at least 300.degree. C.

Abstract: Electrical cables that carry higher voltage require insulation of greater thickness. This invention extrudes the insulation over a cable core and extrudes it in superimposed layers which fuse to one another to prevent formation of voids within the insulation. The insulation applied in each superimposed layer increases the impulse breakdown stress in volts per mil of insulation thickness. A high voltage cable for any given voltage can, therefore, have a thinner insulation if the insulation is applied in layers according to this invention instead of being applied in a single layer in accordance with the practice of the prior art.

Abstract: A polymeric composition having a polymer content which tends to evolve deleterious acid compounds upon being subjected to elevated temperatues; the composition including selected particle matter which is present in an amount to combine with or otherwise neutralize essentially the entire evolved deleterious compound when the composition is subjected to elevated temperatures; the composition with or without plasticizers being useful as insulation or jacketings for electric wire and cable, as well as diverse molded or extruded products, including disposable items such as packaging or the like.

Abstract: Lubricants for lacquered wires are provided comprising compounds of the type A-C-B, which compounds at room temperature have an ointment or soap-like consistency, wherein A is a chemical grouping containing reactive groups which permit chemical incorporation in a polymerizable impregnating resin system, B is a saturated or unsaturated aliphatic hydrocarbon radical, and C is a binding member in the form of a carbon, nitrogen, oxygen, or sulfur grouping.The lubricant is advantageously a 2,4-dienoxy-6-aminoalkyl (-ene)-s-triazine, particularly 2,4-dienoxy-6-aminostearyl-s-triazine. Such triazines are also useful according to another embodiment of the invention as lubricants for wire with enamel insulation.

Abstract: An electrical insulation coated metallic wire consisting of a releasing layer coated on a metallic wire and an insulating layer superposed on the releasing layer. The insulating layer is formed by coating and baking an insulating varnish on the releasing layer. The electrical insulation coated metallic wire is used as an insulated conductive wire or an insulated resistance wire, the former using an electric conductor as the metallic wire and the latter using an electric-resistive substance as the metallic wire.

Abstract: An apparatus for converting three-phase electrical energy into direct current includes Scott-connected transformers with oppositely biased SCRs connected in parallel to two of three input terminals. The SCRs are controlled so that they fire in alternate and rotating sequence between the two input terminals. The secondary output voltages of four terminals are rectified so that the common rectified output voltage is a substantially DC voltage with a minimum ripple. The secondary output terminals are aligned in a common plane and are connected to deformable, tapered leads. The rectifiers are connected between the deformable leads and to a common slotted, conductive plate which is connected to a welding electrode. A center tap from each of the secondary windings is connected to another welding electrode. The deformable tapered leads and the slotted conductive plate provide an equal resistive path for pairs of rectifiers for each secondary output to equalize the current flow through the two sets of diodes.