Abstract: A fully shielded flexible ribbon cable having transmission line electrical characteristics and flexible ribbon cable mechanical characteristics capable of easy mass termination. The cable has a plurality of circular uniformly spaced signal conductors lying in a single plane encased in insulation having an effectively uniform dielectric constant of not more than 3.0. A sheet conductor is bonded to the insulation providing both transverse and longitudinal electrical continuity. The ratio of the diameter of the signal conductors to the distance between centers of the signal conductors is between 0.16 and 0.42. The ratio between the thickness of the cable at the inner surface of the sheet conductor to the distance between centers of the signal conductors is not more than 1.5.

Abstract: Significantly enhanced bending characteristics are provided in a coaxial cable by reducing the stiffness of the tubular sheath in relation to the stiffness of the core. The cable comprises a core including at least one inner conductor and a low loss dielectric surrounding the inner conductor, and an electrically and mechanically continuous tubular metallic sheath closely surrounding the core and being adhesively bonded thereto, the ratio of the stiffness of the core to the stiffness of the tubular sheath being greater than 5.

Abstract: A dielectric system for coaxial electrical conductors is provided. The dielectric system separates an inner and outer conductor and is composed of a first layer of braided high tensile strength polymeric fluorocarbon filaments in an open weave surrounding the inner conductor. Surrounding the layer of braided filaments is a continuous layer of a polymeric film which is in turn surrounded by a continuous layer of a crosslinkable polymeric lacquer enclosing both the layer of braided filaments and the layer of polymeric film.

Abstract: A method for producing a laminated sheath product utilizing a single layer tape and providing good waterproof characteristics. A tape is longitudinally supplied, if desired, with a core, into a first die which preliminarily shapes the tape to a partial tubular form. The tape is then passed through a second die which completes the tubular formation of the tape while applying an adhesive thereto. The adhesive at the second die completely fills the area around the overlapping edges of the tape to provide a tight waterproof seal.

Abstract: An optical fiber submarine cable comprising at least one optical fiber. A pipe-like pressure resisting layer is produced by forming a tape-like pressure resisting material into a pipe-like configuration with the optical fiber inserted therein. The pressure resisting layer has butt ends in its cross section, and a waterproof insulator layer is disposed closely around the pipe-like pressure resisting layer for maintaining the pipe-like configuration of the pipe-like pressure resisting layer and for preventing seawater from entering into a gap between the butt ends.

Abstract: A dielectric system for coaxial electrical conductors is provided. The dielectric system separates an inner and outer conductor and is composed of a first layer of braided high tensile strength polymeric fluorocarbon filaments in an open weave surrounding the inner conductor. Surrounding the layer of braided filaments is a layer of cellular polyparabanic acid tape which is helically wound along the length of the cable with a negative overlap. Circumferentially surrounding these two layers along the length of the cable is a continuous layer of polymeric film which is in turn surrounded by a continuous layer of a crosslinkable polymeric lacquer.

Abstract: Tubing and electrical cable utilizing shields made from a flexible metal tape that has a coating of a copolymer of ethylene with a monomer having a reactive carboxyl group bonded to at least one of its sides and to which coating is bonded an adhesive that is adapted to bond the coating to flexible or semi-rigid non-olefinic polymeric materials so as to provide such tubing and electrical cable with improved flexibility and resistance to wrinkling or bending.

Abstract: A method of making a cable (20) specially suited for use in building plenums because of its low flame spread and smoke evolution includes enclosing a multiconductor core (22) in a sheath comprising an inorganic, cellular core wrap (31), a corrugated metallic barrier (40) and dual layers (51) and (52) of a polyimide tape. The tapes are wrapped helically about the barrier in a manner that avoids a compression of the core wrap. The sheath is effective to resist heat transfer inwardly toward the core by conduction while the metallic barrier reflects radiant heat. Advantageously, the sheath containerizes the core without unduly compressing it and thereby allows the intumescence of conductor insulation during a fire to form char which is effective to suppress the evolution of smoke and the propagation of flame.

Abstract: A multiple sheath cable for telemetry, heating and communications and methods of manufacturing such cable in long lengths with high tensile strength. The telemetry and communications cable may be of the wire type for conducting electrical signals or fiber optics for conducting laser or other optical signal, the conductors being typically insulated by mineral insulation material or organic insulation material. These insulated conductors are provided with concentric multiple layers of metal tubular sheaths having staggered weld joints for increasing tensile strength while protecting the conductors and the insulation from extreme environmental conditions such as heat, pressure and corrosion.

Abstract: A flat cable shielding device comprises a metal foil sleeve formed of an upper and a lower length of conductive metal foil. To aid the insertion of flat cable into the shielding device, a low-friction inside surface is provided on the inside surface of the metal foil sleeve. The outside of metal foil sleeve is covered with an electrically insulating film, to provide wear and scuff protection. Both the low-friction inside surface and other outer coating are coupled to the metal foil sleeve preferably using adhesive. Good electrical connections can be made easily to the shielding device which can be used as a floating ground or can be grounded to a common system ground as desired.

Abstract: An insulated cable has a hermetically enclosed sheath. Between the sheath and the insulation of the cable is a filler of a thermoplastic material. When the cable is heated (e.g. a localized fire) gases and acids that are given off by the insulation are absorbed by the filler which also expands resulting in a structural blockage to the longitudinal flow of the acids and gases.

Abstract: Electrical conductors having suitable combinations of coatings and coverings are disclosed which have the ability to inhibit low molecular weight hydrocarbon well fluids when under pressure and withstand high proportions of gassy hydrocarbons under pressure without undergoing rupture failure.

Abstract: A sheath heater having a heating wire embedded in a ceramic insulator such that the thermal deformation of the heating wire is substantially prevented, wherein the heating wire is formed of a nichrome-based wire having an Al-rich surface layer so as to permit forming an oxidation-protective alumina layer on the surface of the nichrome-based wire.

Abstract: A multiwire conductor in which a layer of wires surrounds a center wire. The center wire has a predesigned structure which produces many small, negligible kinks instead of few intolerable ones, which may otherwise occur as the result of temperature changes or stress variations.

Abstract: Disclosed is an electrical cable (10) which includes a plurality of insulated conductors (11) bound together in close proximity to one another to form a cable core. A sheet of insulative material (13) surrounds this cable core and this assembly in turn is further surrounded with a conductive shield (14). An insulative sheath (16) surrounds the entire assembly. Integral with the conductive shield are means (15) for providing shield continuity when the insulative sheath and conductive shield are entered.

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: In a process for producing a highly expanded polyolefin insulated coaxial cable comprising the steps of feeding a polyolefin, a nucleating agent and a volatile liquid as a blowing agent to an extruder and heat extruding said mixture through said extruder onto an inner conductor passing through said extruder to cover the outer periphery of said inner conductor thereby forming an insulation layer of a highly expanded polyolefin foam having a foaming ratio in excess of 2.5 times (60% expansion degree), the improvement which includes the step of, after extruding the foaming polyolefin mixture around said inner conductor, sizing the outer surface of said foaming polyolefin layer on said inner conductor by means of a sizing die to provide a highly expanded uniform polyolefin insulation layer of a predetermined size, said insulation layer being tightly adhered to said inner conductor.

Abstract: This invention relates to the transmission of electric power and in particular provides an electric power-transmission system having reduced vector regulation, voltage drop, and power loss through the inclusion of capacitance in the cable in series between the generator and load by utilizing electric conductors, i.e., connective links, having capacitance distributed along the length of the cable. Such capacitance is achieved by dividing a conductor into two parts which are separated by dielectric material such that the two conductor parts are in capacitive relation along the length of the cable and by connecting one conductor part to the generator and the other conductor part to the load such that the distributed capacitance is in series with the generator and load.

Abstract: A specially configured cable, which, in use, has a cross section which is mmetrical to a vertical line, but asymmetrical to a horizontal line, is used for an intrusion detection system. It comprises an external sheath, which may be round or rectangular in cross section. An inner conductor is positioned below the center of the cable. It is supported in place by a thin, substantially flat, sheet of insulating material, which is attached to the inner surface of the outer sheath. This particular configuration maximizes the change in capacitance caused by an intruder passing over the cable. The cable is connected to a time-domain reflectometer, which can display on a screen the location of the intrusion with respect to an end of the cable as well as the probable type of intrusion.

Abstract: This invention provides a tetrafluoroethylene polymer in a porous form which has an amorphous content exceeding about 5% and which has a micro-structure characterized by nodes interconnected by fibrils. The material has high porosity and high strength. It can be used to produce all kinds of shaped articles such as films, tubes, rods, and continuous filaments. Laminations can be employed and impregnation and bonding can readily be used to produce a large variety of articles. Compressed articles of very high strength can also be produced from these porous forms.

Abstract: This inside wiring cable has insulated conductors surrounded by one or more layers of heat-resistant tape covered by a protective metal sheath which is preferably made of longitudinally folded metal strip with the seam welded and the tube metal then reduced in diameter down into intimate contact with the core and annealed. The cable is fire-resistant so that it does not spread fire. The metal sheath prevents any "afterburn.

Abstract: The invention provides an improved wireline that comprises one or more insulated conductors contained within a smooth walled metal sheath; which improved wireline is satisfactory to perform all of the normal wireline operations in an earth borehole and particularly in very deep boreholes; and in which the sheath material of the wireline is a metal having a high yield strength to weight ratio, and the sheath is swaged into intimate contact with the inner insulated conductor or conductors, such that the weight of the inner conductor or conductors and insulation is effectively supported by the sheath.

Abstract: Disclosed is a coaxial cable having greatly improved mechanical and electrical properties derived from a foamed dielectric having a dielectric constant in the range of 1.32 to 1.1, such cable being provided by a novel method of coating a center conductor of the cable with a dielectric with an extruded cellular polyolefin base composition which has been rendered cellular by the direct injection of a blowing agent in a liquid form into the polymer during an extrusion process. Also disclosed is an apparatus and a method of continuous wire electropolishing and pre-coating.

Abstract: Disclosed is a coaxial cable having greatly improved mechanical and electrical properties derived from a foamed dielectric having a dielectric constant in the range of 1.32 to 1.1, a density between 0.1 and 0.29 grams per cubic centimeter, said foamed dielectric having dispersed throughout it undecomposed particles of a nucleating agent such cable being provided by a novel method of coating a center conductor of the cable with a dielectric with an extruded cellular polyolefin base composition which has been rendered cellular by the direct injection of a blowing agent in a liquid form into the polymer during an extrusion process.

Abstract: Electrical conductors having an insulation layer comprising a thermosetting elastomeric composition capable of imbibing low molecular weight hydrocarbon well fluids when under pressure and rapidly desorbing the fluids when pressure is removed, and surrounded by a confining braid layer are able to withstand use in gassy oil wells without consequent depressurization-caused rupture failures. Armored electrical cables formed from these insulated conductors without an elastomeric jacketing are suitable for use in powering electric motors in oil wells that have particularly high proportions of gassy hydrocarbons under pressure without undergoing rupture failure.

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: 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 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: 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: A terpolymer, consisting essentially of (a) a first component of ethylene, (b) a second component selected from an (1) unsaturated glycidyl ester of the following formula (I) and (2) an unsaturated glycidyl ether of the following formula (II), and (c) a third component selected from an alkyl acrylate, an alkyl methacrylate and vinyl acetate, is coated on one or both surfaces of a metal foil to make a laminate tape. ##EQU1## wherein R represents a hydrocarbon residue containing an ethylenically unsaturated bond.The laminate tape is used for preparing a laminate sheathed cable. The terpolymer resin may contain an antioxidant.

Abstract: The mechanical properties of laminate sheathed cables are improved by using as the shielding layer a laminate tape prepared by coating a metallic foil with an ethylene-glycidyl-methacrylate-vinyl acetate terpolymer

Abstract: A counterwound, magnetic core for a towed-cable, helically wound, ELF anta comprising a cylindrical, plastic, center insert, with or without a center conductor, with two strips or sets of strips of magnetic material counterwound about it so that a plurality of good-mechanical-contact, strip, crossover points are formed distributed around the circumference of the insert and down its length. An insulating material is then wrapped around these counterwound strips and a conductor helically wound around that. This design, by providing alternate flux paths down the core via the crossover points provides a lower, core reluctance and, when the core is under stress, provides a flux path that avoids the high-stress regions of the core thus reducing the amount of flux that is stress-modulated. Thus a substantial magnetostrictive noise reduction is obtained.