Abstract: A high voltage cable which has a composite jacket having inner and outer parts. A corrugated moisture barrier is sandwiched between the parts and bonded to them. The jacket prevents both radial and longitudinal flow of moisture in the cable. The moisture barrier may serve as a return conductor or the jacket may include additional return conductors.

Abstract: Petrolatum-based filling compounds are known to migrate into the insulation and jacket of telephone cables and to extract the stabilizers, and as a consequence, to affect the physical and/or electrical characteristics of those cable components. It does not seem possible to avoid these characteristics of petrolatum in commercial compounding operations. The filling compound of this specification is for use in telephone cables and is based on better resistance to dripping at elevated temperatures, compatibility with high density polyethylene insulation and low density and medium density polyethylene jacket compounds. It has processability at moderate elevated temperatures, resistance to cracking at room temperature and low temperatures, adhesiveness and desirable electric properties.

Abstract: Sealed power cables (e.g. for underground or submarine use) are often equipped with a metal sheath. A problem with some such cables is that their insulation is subject to greater thermal expansion of the cable during use than the metal sheath is capable of following. According to the present invention the metal sheath (5) is longitudinally corrugated either when the metal sheath is manufactured or by pressing a metal sheet which is originally plane over resilient ribs disposed longitudinally on the cable.

Abstract: A waterproof shielded cable is disclosed having a metallic shield formed with a longitudinal seam surrounding a core. A strip of material overlays the metallic shield seam with side edges located to each side of the seam. An extruded plastic jacket overlays the metallic shield and strip of material with the jacket being in intimate contact with the shield and with a principle surface of the strip of material but spaced from the strip side edges.A method is also disclosed for manufacturing a shielded cable which comprises the step of wrapping sheet metal about a cable core with the sheet metal edges overlapped to form a shield with a longitudinal seam. The shield seam is overlayed with a strip of material of a type characterized by being shrinkable when heated above a predetermined temperature, and with the strip edges straddling the shield seam. A plastic jacket is extruded onto the shielded core and strip of material at a temperature in excess of the predetermined temperature.

Abstract: A paper pulp insulated cable of the kind having a plurality of conductors covered with paper pulp insulation. The insulated conductors are twisted into pairs, the pairs are stranded into units and the units are built up into cores, covered with, for example, a paper wrap, aluminum, steel sheath and a polyethylene jacket. The cable has a high density of conductors. Also a method of manufacturing such cables is described.

Abstract: A submersible cable for a fish-repelling installation comprises a central conductive-wire core covered with a conductive smoothing layer and then with an insulating layer. A first conductive layer is applied over this first insulating layer, then a second insulating layer and a second conductive layer that constitutes a field limiter. Armor in the form of synthetic-resin strands is then wound over the cable and a waterproof layer is applied to the outside of the cable. After the application of each insulating layer the cable is tested for leakage in order to repair any discovered leaks before the next conductive layer is applied to the cable.

Abstract: A high frequency coaxial cable suitable for aerial and ultra-high-frequency lines of the type having a metal internal conductor, a plastic dielectric concentrically surrounding the internal conductor, an external conductor surrounding the dielectric and comprising a metal wire mesh and a plastic foil strip metallized on at least one side, and a plastic sheath enveloping the external conductor as an external protective cover, wherein the wires of the wire mesh are arranged in net-like configuration to define an open wire mesh enclosing the dielectric and the plastic foil strip is applied on the wire mesh in helical edgewise overlapping windings with its metallized side facing the wire mesh and is pressed into each single mesh opening of the wire mesh in form of a generally trough-like dent or dimple thereby short-circuiting each single mesh opening of the wire mesh.

Abstract: Communication cables with cores that have groups of conductor pairs, that carry messages in opposite directions, in the same cable present the problem of crosstalk between the different groups. With the increase in carrier frequency that is used for communication, the crosstalk problem increases, and cables that were acceptable for lower frequency are no longer adequate. This invention provides more efficient shielding; is suitable for higher frequencies; provides a stronger cable structure; and reduces corrosion of the shielding.

Abstract: A screen for electric power cables comprising a metal tape with a coating on one side of a thermoplastic with parallel metal wires extending longitudinally of the tape and along non-rectilinear paths partially embedded in the coating and preferably contacting the tape. The tape may also be coated with a plastic on the opposite side with a plastic which will provide good adherence to an insulating sheath. Also, a cable including such screen around the conductor thereof and the insulation on the conductor, and a method for making the screen which comprises heating a so-coated tape, applying the wires to the heated coating in non-rectilinear, parallel paths, pressing the wires into the coating and allowing the latter to cool.

Abstract: A cable comprises a plurality of insulated conductors enclosed in a corrugated metallic shield jacketed with a plastic material. As a corrugated metallic tape is wrapped longitudinally about the core to form the shield, overlapping longitudinal edge portions of the shield are intentionally spaced apart radially. When the plastic jacket is extruded over the shield, a portion of the plastic material extends between the overlapped but spaced apart longitudinal edge portions. This prevents lock-in of the corrugations along the overlapped edge portions and provides the cable with an additional degree of freedom of movement so that the cable can withstand placement stresses caused by sharp radius bending during installation without shield separation or cracking.

Abstract: A cable structure for telecommunication or power supply applications, comprising one or more conductors, each of which is surrounded by a micatape embraced by an insulating layer of heat resistant rubber. The conductors are embraced by a thermoplastic elastomer on the outside of which there is placed a braided metal armour. The structure has an outer sheathing of chlorine sulphonated polyethylene or ethylene propylene rubber. Used as a three-conductor power cable the conductors are twisted together inside the layer of thermoplastic elastomer.

Abstract: This cable for high-voltage, alternating current power transmission cables not only reduces the access of moisture into the cable but reduces access of moisture to the inner face of the insulation to such an extent as to make the cable highly resistant to the formation of electrochemical trees in the solid extruded insulation of the cable. A compressible layer of closed cell, foamed plastic is extruded over the outside surface of the insulation; and a metallic shield fits tightly around the compressible layer, the metallic shield being a longitudinally folded tape with a lap seam which is preferably bonded to prevent ingress of air or other fluid into the cable. If the conductor is stranded, sealant is used to prevent ingress of moisture, or of air, and the humidity it contains into the cable at cable ends.

Abstract: A shielded ultra-miniature cable suitable for example to provide low voltage connections, the cable including one or more low voltage conductors surrounded by an insulation coating, the insulation coated conductors being surrounded by a semiconductive coating providing a ground shield. The insulation and semiconductive coating are formed from thermoplastic materials of limited thickness to permit soldering of said shielded cable without requiring prior removal of said semiconductive and insulation coatings and to maintain minimum dimensions for the cable.

Abstract: A process is taught for producing plastic jacketed cable for use in underground ducts exposed to unusually high temperatures and having a corrugated metallic shield which imprints the plastic covering includes an inner jacket capable of providing and maintaining adequate strength properties notwithstanding imprinting thereof by the corrugations of the shield contiguous thereto and an outer jacket superimposed over the inner jacket and suitable for resisting degradation while being exposed to elevated temperatures for sustained periods of time.

Abstract: A means of obtaining improved adhesion of the jacket to the metal sheath of an electrical conductor involving the use of a dual layer film as the material for adhering the two to each other is disclosed. The dual layer film contains a film layer of an ethylene/acrylic acid copolymer or an ethylene/methacrylic acid copolymer or the ionomer salts thereof and a film layer of polyethylene or an ethylene/acrylyl ester copolymer or an ethylene/vinyl acetate copolymer.

Abstract: A multiple caged tapered strength armored electromechanical cable is provided which is characterized in being torque balanced throughout its entire tapered strength length. The selective strength tapering of the cable permits the orientation of the cable such that the strongest portion thereof will support the entire cable and the weakest portion thereof will support only itself and whatever instrumentation is desirable.

Abstract: A multiple caged armored electromechanical cable is provided which is characterized in being torque balanced and strength tapered throughout its entire length. The cable is configured having selectively formed elements within the caged armored layers for retaining individual wires in the armored layers statically without appreciable friction between layers.

Abstract: A multiple caged armored electromechanical cable is provided which is characterized in being torque balanced and strength tapered throughout its entire length. The selective strength tapering of the cable permits the orientation of the cable such that the strongest portion thereof will support the entire cable and the weakest portion thereof will support only itself and whatever instrumentation is desirable. A slip sleeve mechanism is provided for retaining portions of the strength tapered elements of the cable to prevent inadvertant electrical shorting as well as providing for a relative slippage of the tapered strength elements with respect to select other elements of the cable.

Abstract: A cable shielding tape comprising a metal strip having a first adhesive layer of polymeric resinous material tightly adhered to at least one side thereof and a bond control layer of polymeric resinous material strippably adhered to the first adhesive layer, and plastic jacketed electrical power and communications cables utilizing such shielding tape. The outer plastic jacket of such cables withstands delamination under conditions of normal use but can easily be removed to facilitate the grounding and splicing procedures; the adhesive layer remains tightly adhered to the metal strip for protection against corrosion following the removal of the jacket.

Abstract: Disclosed are several embodiments of Improved CATV (Coaxial Drop Wire), using either foil laminate or a metallic braid in combination with another foil laminate adhesively bonded to the drop wire core dielectric, the improvements being (a) the elimination of traverse (radial) cracks, commonly called "tiger striping," developing in the foil as a result of the foil wrinkling, and (b) the elimination of slot antenna effect. One embodiment employs two laminated tapes, one circumferentially surrounding the other and both circumferentially surrounding a core. One laminated tape is bonded to the core dielectric and the other is bonded to a jacket, surrounding the outer laminate tape. The other embodiment employs a metallic braid tape circumferentially surrounding a metal foil-plastic film-metal foil laminate tape adhesively bonded to the core dielectric.

Abstract: A plastic jacketed cable; having a corrugated metallic shield which encloses a core comprising a plurality of insulated conductors, for use in underground ducts exposed to elevated temperatures includes an inner jacket which is capable of providing and maintaining adequate strength properties notwithstanding imprinting thereof by the corrugations of the shield contiguous thereto, and an outer jacket superimposed over the inner jacket and suitable for resisting degradation while being exposed to the elevated temperatures for sustained periods of time.

Abstract: A cable for carrying high voltage has encompassed on its metallic conductor core with an inner layer of semiconducting material. An insulation layer encompasses this semiconducting layer and is in turn encompassed by an outer semiconducting layer. This outer semiconducting layer is strongly bonded to the underlying insulation layer and its outer surface resistivity is selected to be within the range of 10.sup.7 - 10.sup.9 ohm/square. Such resistivity range equalizes the voltage distribution within the cable jacket and also facilitates splicing cable ends and terminating the cable as the outer semiconducting layer need not and in fact cannot be readily removed.

Abstract: This invention is an improved filling compound for preventing moisture penetration along the interior of high voltage electric power cables. Amorphous polypropylene, mixed with carbon where it must be semiconductive, is an extremely good filling compound because of its electrical characteristics and also because of its good flow characteristics when extruding. When the cable is to be used under conditions where it must withstand temperatures so low that the polypropylene becomes brittle, it can be blended with polyisobutylene rubber to withstand lower temperatures, but the blend must be kept within limits to prevent loss of the good flow characteristics of the amorphous polypropylene.

Abstract: A plastic laminated metallic foil is prepared by laminating a first layer of a polymer selected from the group consisting of ethylene-unsaturated carboxylic acid copolymers, ethylene-unsaturated carboxylic acid ester copolymers, ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid-ester ternary copolymers, ionomers containing these copolymers as the base, and graft copolymers of polyethylene and unsaturated carboxylic acids on at least one surface of a metallic foil, and further laminating a second layer of a polymer selected from the group consisting of polyethylene, ethylene-vinyl acetate copolymers, ethylene-unsaturated carboxylic acid ester copolymers, and graft copolymers of polyethylene and unsaturated carboxylic acid esters onto the first polymer layer of the metallic foil.

Abstract: This internally shielded telephone cable provides more efficient shielding for meeting near-end crosstalk requirements in carrier systems having expanded channel capacity and increase in equivalent frequency from 772 kHz to 1.576 MHz or higher. The improved shielding uses tapes bent into configurations that obtain greater shielding area from a single tape, and constructions that are less expensive than prior art and produce a mechanically stronger and more unitary cable structure.

Abstract: The electrical screening characteristics of a submarine coaxial cable are significantly improved by increasing the overlap between the longitudinal edges of the tape return conductor to at least 10% of the return conductor circumferential length.

Abstract: In high voltage power cables with metal shields that have lap seams with the seam edges movable with respect to one another, a bridging tape is frequently used over the seam and a plastic cable jacket covers the metal shield and the bridging tape. This invention provides a novel bridging element that covers the lap seam and that is made of soft and resilient material with edge portions thinner than the center of the bridging element to provide a streamline contour.

Abstract: A jointer for laminated tapes for use in the production of sheathed cables formed by longitudinally or helically wrapping cable cores with metal tapes laminated with plastic films and by joining the overlapped portions of said tapes by way of heat fusion is disclosed. The method comprises the use of pressing blocks consisting of metal material having a high heat conductivity and respectively having machined surfaces opposing in parallel to each other for the application of uniform pressure to both surfaces of the laminated tapes held therebetween. A heating piece is provided which is electrically insulated from and mounted to the bottom of the pressing block and having relatively high electric resistance and being supplied with electric current thereby pulse heating the portions of the laminated tapes to be spliced.

Abstract: A fire protective insulating product which, when placed about electrical cables, cable trays or conduits, is capable of protecting the cable or pipe from exposure to open flame temperatures of 1600.degree. to 2000.degree. F. The product comprises a first layer containing insulative, inorganic non-combustible fibers, and a coating thereon comprising 1.5 to 20% organically bound halogen, 3 to 75% high temperature resistant non-combustible fiber, and 5 to 75% resinous binder.

Abstract: A shield wire includes an inner conductor, a first dielectric surrounding the inner conductor, a second dielectric of Japanese paper placed over the first dielectric, a middle conductor relatively high in resistance placed over the second dielectric, a braid of copper alloy woven over the middle conductor to form an outer conductor, and a covering of elastic dielectric placed on top of said braid, thereby to prevent not only the influence of induction hum due to external magnetic fields but also the generation of noise signals due to bending of a shield wire.

Abstract: A plastic laminated metallic foil is prepared by laminating a first layer of a polymer selected from the group consisting of ethylene-unsaturated carboxylic acid copolymers, ethylene-unsaturated carboxylic acid ester copolymers, ethylene-unsaturated carboxylic acid-unsaturated carboxylic acid-ester ternary copolymers, ionomers containing these copolymers as the base, and graft copolymers of polyethylene and unsaturated carboxylic acids on at least one surface of a metallic foil, and further laminating a second layer of a polymer selected from the group consisting of polyethylene, ethylene-vinyl acetate copolymers, ethylene-unsaturated carboxylic acid ester copolymers, and graft copolymers of polyethylene and unsaturated carboxylic acid esters onto the first polymer layer of the metallic foil.

Abstract: A power cable having a plastic electrical insulation which is partially or wholly composed of a plastic compound. The plastic compound containing an inorganic or organic electrolyte which ionizes when dissolved in water, the power cable prevents the deterioration of insulation called "water tree" which has been a fatal drawback of the plastic insulation layers of the conventional plastic insulated cables such as cross-linked polyethylene cables, etc.

Abstract: A cable for detecting, in a stable and waterproof way, any leak of petroleum, petroleum product, or other fluid from an underground pipeline by means of a change in the electrostatic capacity between inner and outer conductors of the cable due to permeation by the leaking fluid. The cable offers constant, uninterrupted monitoring of such a pipeline with no limit to the watching range, and can accurately locate even a minor leak. The invention also involves a method of installing a detection system using such a detector cable, and a detection method which depends on electric pulses as means for detecting such a leak.

Abstract: A longitudinal sealant barrier for cables carrying electrical energy which barrier is situated between a metal screen and a semiconductor layer covering the insulation of the metal core of the cable. It comprises a continuous or discontinuous layer arranged on the internal surface of the screen of a thermofusible mixture and a succession of rings of the same mixture, each ring being optionally provided on the side of the layer with a layer of a cellulose derivative.

Abstract: A sheathed electromechanical cable comprises an insulated core and a plurality of strain members in the form of wires or fibers of high tensile strength, sandwiched between the sheath and the core. The sheath is made of a formable material of high tensile strength and which, in combination with the strain members, directly resists tensile and flexion stresses on the cable. The strain members are supplied to the core along a predetermined, converging path and are disposed in uniformly spaced, annular relation relative to the core and brought into snug engagement therewith by drawing through a die, the latter being associated with an extruder device for applying the sheath material around the exposed surface of the strain members. The extrusion period is short and is followed by a quench. The insulated core is composed of a single or a plurality of discrete conductors, with or without individual insulation, and surrounded by a dielectric.

Abstract: A cable shielding tape comprising a first layer of substantially pure aluminum bonded to a second layer of aluminum alloy which can beneficially be used in cable constructions designed for the transmission of electric power or communications. The cable shielding tape may be formed as a strip having one or both sides coated with or laminated to an adhesive thermoplastic resinous polymer. The tape is disposed within a cable at the desired location to provide good mechanical and electrical properties therein. In addition to providing good mechanical and electrical properties for a cable, the aluminum/aluminum alloy shielding tape substantially reduces the problem of bi-metallic galvanic corrosion caused as a result of interfacing metals having widely differing electrolytic potentials.

Abstract: In a power cable including a central conductor, an extruded inner conductor surrounding the conductor, an inner layer of extruded insulation surrounding the inner conducting layer, an extruded outer conducting layer surrounding the extruded insulation, a metal shield surrounding the outer conducting layer and an outer insulating sheath surrounding the metal shield, an intermediate insulating layer having a mechanical peel strength lower than that of the outer conducting layer and of the inner insulating layer is interposed between the inner insulating layer and the outer conducting layer to permit the outer insulating layer, metal shield and outer conducting layer to be easily peeled away from the inner insulating layer without damage to the outer conducting layer and without leaving a conducting residue on the inner insulating layer.

Abstract: An electromechanical cable is adapted for deployment along a generally straight path and when thus deployed to be substantially free of torsional reactions resulting from changes in tensile stress in the longitudinal direction of the cable. The cable includes a plurality of strain members arranged in an annular configuration. When the cable lies straight and untwisted the strain members are also straight, parallel to the longitudinal axis of the cable and parallel to each other. The strain members are loosely confined within the cable structure so that when the cable is subsequently twisted they are free to move into helical positions relative to the axis of the cable.The cable is first wound into a coil and concurrently pretwisted about its own axis by approximately 360.degree. for each loop of the coil. After being transported to the deployment site, the cable is pulled off the coil without relative rotation between the delivered end of the cable and the coil, so that the pretwist of the cable is relieved.

Abstract: An electric cable having a multi-stranded core of insulated conductors and a jacket, in which the spaces between and around the conductors are at least partially filled with a mixture which forms a blockage to the penetration of water. The mixture comprises water repellant treated calcium carbonate and high molecular weight polyacrylamide resin which do not react with each other or when in contact with water. Preferably the individual conductors are coated with a hydrophobic liquid such as a low viscosity paraffinic oil.

Abstract: A method of jacketing an electric cable having a corrugated metal sheath, in which the sheath is cleaned, a coating of thermosetting, castable polyurethane is applied to fill the troughs in the corrugations, a fabric is wrapped onto the coated sheath and coated with the same polyurethane, and thermoplastic polyurethane is extruded onto the cable to form a jacket. The coatings of the polyurethane serve as an adhesive for bonding the jacket to the metal sheath. A cable produced by this method comprises a layer of fabric circumscribing the corrugated metal sheath and a jacket of thermoplastic polyurethane overlying the sheath, the fabric being embedded in a layer of thermosetting, castable polyurethane bonding the jacket to the sheath.

Abstract: An integrally bonded composite structure of a substrate part or layer of metal or the like, an elastic interface layer, and a thermoset plastic wall or layer molded in place against it is formed by: (1) coating the substrate, as by spraying, with a thin coating of a thermosetting soluble elastomer, such as a chloroprene rubber (Neoprene), formulated to chemically bond to the substrate surface, and also containing a coupling agent which will react with the thermoset plastic layer during curing of the latter; (2) heating the coating to dry and stabilize the same on the substrate so as to withstand transfer flow of molding composition but without completely curing the coating composition; and (3) molding the plastic layer against the coated substrate under heat and pressure as in a heated molding die while the coating is in incompletely cured state, and thereby completing the curing of the coating as the molded plastic layer is cured and producing an integral chemical bond from the molded layer through the inter

Abstract: In a high-frequency communication cable with foam plastic insulation and an outer conducting tape having a bonded longitudinal overlapped seam, a separate metal bridging strip is inserted under the seam.

Abstract: The telephone communication cable of this specification has a metal shield formed by bending a sheet of metal at one or both edges so that the portions of the sheet that are folded over one another form a shield of double thickness and the shield has one or both of its edges formed by a continuous extent of folded metal instead of a square edge or fluted edge with a burr along the side of the edge toward which the slitting instrument advanced to make the cut. Air spaces are prevented by filling any clearance between the folded areas of the shield with adhesive. The shield is applied as a D-Screen with the edges off the original strip on the curved part of the D-Screen and away from the group of pairs that are shielded by the D-Screen.

Abstract: A corrugated plastic article comprising at least two corrugated plastic films each of polyethylene terephthalate held in contact with each other and capable of substantially maintaining its shape under extreme use conditions.Such corrugated plastic article when heated for 5 minutes at 150.degree.C. has a percent (%) fallout (i.e., the original peak-to-peak height of the corrugations minus the retained peak-to-peak height thereof after heating divided by the original peak-to-peak height) of less than 35%.In an electrical cable having a conductor core, this corrugated plastic article provides an improved protective member for the core, having good dielectric strength and mechanical strength, electrical stability, low moisture sensitivity and other properties, wherein the corrugations, strength and shape-retention capabilities of the article provide improved cushioning, insulation and other protection for the core.

Abstract: A shielded electrical cable is described having improved interference immunity and radio frequency screening by virtue of the mode of application of the shield. The shield is insulated from the inner conductor or conductors and comprises a pair of coaxial wire braid layers separated by a continuous metal tube which is flexible and does not bind upon the underlying braid. The tube is peferably formed from mu-metal or other metal tape wound onto the braid in partially overlapping helical turns, the winding tension is insufficient for the overlapping margin to compress the underlying margin of the previous turn, this latter operation being performed in a rotary tubular die whose bore allows for a small annular clearance to be preserved between the wound tape tube and the underlying wire braid.

Abstract: A composition useful for filling communication cables is described which comprises petroleum jelly and a small amount of siliceous material which renders the petroleum jelly viscous at elevated temperatures, and prevents leakage of the petroleum jelly from a cable having a flaw, which is subjected to elevated temperatures.

Abstract: A metal foil-plastic laminate comprising an upper layer of a member selected from the group consisting of a polyethylene-vinyl acetate and ethylene-vinyl acetate copolymer containing no more than 8 wt. % of vinyl acetate and a lower layer of an ethylene-vinyl acetate copolymer containing 10-45 wt. % of vinyl acetate, thermally pressed on at least one surface of a metal foil, said lower layer being in contact with the metal foil and method for preparing the same.

Abstract: This electrostatic shielding tape is a metal strip of low resistance and low reactance folded longitudinally over the length of an insulated power cable having a semi-conducting insulation shield surrounding its insulation. The longitudinally folded metallic tape has its edges free to permit expansion of the insulation and insulation shield, located directly under it, without significant deformation of the insulation and the insulation shield. When the tape is of a metal requiring a thin corrosion-protective coating, the coating on the side adjacent to the insulation shield is preferably semi-conducting to accept charging current from the insulation shield. It is a feature that the metal of the electrostatic shield is in electrical communication with the insulation shield. .Iadd.