USPTO Wire & Cable Industry Patents for July 2021

High Frequency Cable Comprising a Center Conductor Having a First Wire Stranded by Plural Second Wires that Provide Corners Free of Gaps
United States Patent 11,037,702 – Issued June 15, 2021
Inventors: Detian Huang, Tokyo, Japan and Masashi Moriyama, Tokyo, Japan
Assignee: Hitachi Metals, Ltd., Tokyo, Japan
A high frequency cable includes a center conductor comprising one first wire, which is located at the center of the center conductor, and a plurality of second wires, which are located around that one first wire, and the one first wire and the plurality of second wires are stranded together. Respective outer peripheral surfaces of the plurality of second wires constitute a substantially continuous circular peripheral surface as an outer peripheral surface of the center conductor.

Flame Retardant and Thermally Stable Compositions for Wire and Cable
United States Patent 11,034,825
Issued June 15, 2021
Inventor: Kevin Edward Trembath, Garrettsville, OH, USA
Assignee: Therm-O-Link, Inc., Garrettsville, OH, USA
The present disclosure relates to flame retardant and thermally stable crosslinked polyethylene compositions for use in wire or cable applications. The compositions comprise ethylene vinyl acetate copolymer, at least one flame retardant, at least one antioxidant, at least one crosslinking agent and a heat resistance agent as discussed further herein.

Aluminum Alloy Wire, Aluminum Alloy Strand Wire, Covered Electrical Wire, and Terminal-Equipped Electrical Wire
United States Patent 11,037,695
Issued June 15, 2021
Inventors: Misato Kusakari, Osaka, Japan; Tetsuay Kuwabara, Osaka, Japan; Yoshihiro Nakai, Osaka, Japan; Taichiro Nishikawa, Osaka, Japan; Yasuyuki Otsuka, Yokkaichi, Japan; Hayato Ooi, Yokkaichi, Japan Assignees: Sumitomo Electric Industries, Ltd., Osaka, Japan; AutoNetworks Technologies, Ltd., Yokkaichi, Japan; and Sumitomo Wiring Systems, Ltd., Yokkaichi, Japan
An aluminum alloy wire composed of an aluminum alloy, wherein the aluminum alloy contains more than or equal to 0.03 mass % and less than or equal to 1.5 mass % of Mg, more than or equal to 0.02 mass % and less than or equal to 2.0 mass % of Si, and a remainder of Al and an inevitable impurity, Mg/Si being more than or equal to 0.5 and less than or equal to 3.5 in mass ratio, and the aluminum alloy wire has a dynamic friction coefficient of less than or equal to 0.8.

Power Cable
United States Patent 11,037,699
Issued June 15, 2021
Inventor: Jae Cheol Gwag, Daegu, Korea
Assignee: LS Cable & System Ltd., Anyang-si, Korea
Provided is a power cable, particularly, an ultra-high voltage underground or submarine cable for long distance direct current transmission. Specifically, the present invention relates to a power cable which includes an insulating layer of high dielectric strength, is capable of uniformly and effectively alleviating an electric field applied to the insulating layer, is particularly structurally stable, has high flexibility, and is capable of suppressing partial discharge, dielectric breakdown, etc. of the insulating layer, thereby increasing the lifespan and productivity of the cable.

Reinforced Superconducting Wire, Superconducting Cable, Superconducting Coil and Superconducting Magnet
United States Patent 11,031,155
Issued June 8, 2021
Inventors: Davide Nardelli, Volketswil, Switzerland and Matteo Alessandrini, Opfikon, Switzerland
Assignee: Bruker Switzerland AG, Faellanden, Switzerland
A reinforced superconducting wire (1a) has a superconducting core strand (2) and a first cladding with a multitude of reinforcing strands (3). The reinforcing strands (3) are arranged around the circumferential surface of the superconducting core strand (2) in a non-crossing manner and are in contact with the core strand (2). The wire has a reinforcement for enhancing its mechanical properties against external stresses and for preventing diameter expansion during heat treatment. In addition to other advantages, such superconducting wire can be produced with an easy and low-cost production process.

Flame- Retardant Electrical Cable
United States Patent 11,031,152
Issued June 8, 2021
Inventors: Franco Galletti, Casatenovo, Italy; Elena Roda, Segrate, Italy; Giuseppe Merigo, Milan, Italy; and Sergio Gutierrez, Vilanova y la Geltru, Spain
Assignee: Prysmian S.p.A., Milan, Italy
A flame-retardant electric cable has a core including at least one electric conductor, an electrically insulating coating and an outermost layer made from a substantially thermoplastic, low smoke zero halogen flame-retardant polymer composition. The composition includes a polymeric base made of at least one polyethylene homopolymer or copolymer having a density of 0.94 g/cm3 at most. The composition further includes 60-64% by weight of a metal hydroxide, at least 2% by weight of an ammonium coated montmorillonite having average particle dimensions of from 5 to 20 μm, and a polysiloxane.

Hybrid Cable Providing Data Transmission through Fiber Optic Cable and Low Voltage Power over Copper Wire
United States Patent 11,025,345
Issued June 1, 2021
Inventors: Donald Lee Sipes, Jr., Colorado Springs, CO, USA and John David Read, Elbert, CO, USA
Assignee: Radius Universal LLC, Lynbrook, NY, USA
A round hybrid cable includes: two metal wires, two fiber optic lines, and a cable jacket enclosing the two metal wires, the two fiber optic lines, and one or more spaces. The enclosing creates the one or more spaces. The round hybrid cable further includes a synthetic filling configured to fill the one or more spaces created by the enclosing. The two metal wires are arranged side by side and the two fiber optic lines are arranged above and below the two metal wires.

Flame Retardant Optical Cable
United States Patent 11,016,256
Issued May 25, 2021
Inventors: Zekeriya Sirin, Milan, Italy and Baris Soenmez, Milan, Itay
Assignee: Prysmian SpA, Milan, Italy
A flame-retardant optical cable is disclosed which includes a polymeric central loose tube housing optical fibres, a metallic armour surrounding the polymeric central loose tube, and a multi-layered sheath surrounding and in direct contact with the metallic armour. The multi-layered sheath includes an inner layer, an intermediate layer, and an outer layer, all made of a LSoH flame-retardant material. The LSoH flame-retardant material of the intermediate layer has a limiting oxygen index (LOI) higher than the LOI of the LSoH flame-retardant material of the inner layer and of the outer layer. Such cable has improved flame-retardant properties, particularly in terms of slowing flame propagation, heat release, droplets and emission of smokes, when it is exposed to flames during fire.

Electrical HV Transmission Power Cable
United States Patent 11,011,287
Inventors: Peter Sunnegardh, Kallinge, Sweden; Marc Jeroense, Karlskrona, Sweden; Anders Gustafsson, Karlskrona, Sweden; Par Lilja, Ronneby, Sweden; Per-Ola Hagstrand, Stenungsund, Sweden; Villgot Englund, Gothenburg, Sweden; Annika Smedberg, Myggenas, Sweden; Ulf, Odsmal, Sweden; Johan Andersson, Hisings backa, Sweden; Virginie Eriksson, Stenungsund, Sweden; Jonas Jungqvist, Stenungsund, Sweden; and Jonny Brun, Nodinge, Sweden Assignee: Borealis AG, Vienna, Austria
A transmission cable includes a conductor or a bundle of conductors extending along a longitudinal axis, which is circumferentially covered by an insulation layer having an extruded insulation material, whereby the transmission cable passes the electrical type test as specified in Cigre TB496, whereby the rated voltage U0 is 450 kV or more. The type test includes subjecting the power cable to a DC voltage of 1.85 U0 during 10 to 15 cycles at negative polarity, followed by a polarity reversal with another 10 to 15 cycles at positive polarity at a DC voltage of 1.85 U0, followed by additional 2 to 5 cycles during at least 4 to 10 days at positive polarity, and wherein U0 is 450 kV, or 525 kV, or more.

Shielded Fluoropolymer Wire for High Temperature Skin Effect Trace Heating
United States Patent 11,006,484
Issued May 11, 2021
Inventors: Wesley Dong, Belmont, CA, USA; Paul Becker, San Carlos, CA, USA; and David Parman, San Ramon, CA, USA
Assignee: nVent Services GmbH, Schaffhausen, Switzerland
A skin effect heating system for long pipelines includes a heater cable disposed in a ferromagnetic or other conductive heat tube. A semiconductive jacket contacts the inner surface of the heat tube, where the charge density of the return current carried by the heat tube is at its highest. The semiconductive jacket material has a resistivity that is sufficiently low to reduce or eliminate arcing events such as corona discharge by allowing accumulated charge on the heat tube to dissipate. The resistivity is also high enough to prevent the return current from flowing into or through the semiconductive outer layer, so that heat production capacity of the system is maximized.

Magnet Wire with Corona Resistant Polyimide Insulation
United States Patent 11,004,575
Issued May 11, 2021
Inventor: Allan R. Knerr, Fort Wayne, IN, USA
Assignee: Essex Furukawa Magnet Wire USA LLC, Atlanta, GA, USA
Magnet wire with corona resistant enamel insulation may include a conductor, and at least one layer of polymeric enamel insulation may be formed around the conductor. The polymeric enamel insulation may include a filler dispersed in a base polyimide material. The filler may include between 20% and 80% by weight of silica oxide and between 20% and 80% by weight of titanium oxide. Additionally, the polymeric enamel insulation may have a thermal index of at least 260°C and a thermal index that is at least twice that of the base polymeric material.

Shielded Electrical Cable
United States Patent 10,998,111
Issued May 4, 2021
Inventor: Douglas B. Gundel, Cedar Park, TX, USA
Assignee: 3M Innovative Properties Company, St. Paul, MN, USA
A shielded electrical cable includes conductor sets extending along a length of the cable and spaced apart from each other along a width of the cable. First and second shielding films are disposed on opposite sides of the cable and include cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the films in combination substantially surround each conductor set. An adhesive layer bonds the shielding films together in the pinched portions of the cable. A transverse bending of the cable at a cable location of no more than 180° over an inner radius of at most 2 mm causes a cable impedance of the selected insulated conductor proximate the cable location to vary by no more than 2% from an initial cable impedance measured at the cable location in an
unbent configuration.

Flame Resistant Covered Conductor Cable
United States Patent 10,998,110
Issued May 4, 2021
Inventor: Bang Wei Yu, Chesapeake, VA, USA
Assignee: Priority Wire & Cable, Inc., Little Rock, AR, USA
Provided are embodiments of a flame resistant covered conductor cable including a conductor wire, a conductor shield disposed about the conductor wire, an inner insulation disposed about the conductor shield and a flame resistant outer jacket formed of a flame resistant cross-linked polyethylene (FR-XLPE) disposed about the inner insulation.

Coaxial Cable
United States Patent 10,991,485
Issued April 27, 2021
Inventors: Detian Huang, Tokyo, Japan; Takanobu Watanabe, Tokyo, Japan; and Kimika Kudo, Tokyo, Japan
Assignee: Hitachi Metals, Ltd., Tokyo, Japan
A coaxial cable includes an inner conductor; an insulator covering a circumference of the inner conductor; a shield layer covering a circumference of the insulator; and a sheath covering a circumference of the shield layer. The inner conductor is composed of first metal strands that are twisted each other in such a manner that a cross-sectional shape of the inner conductor is circular. The shield layer includes a winding shield layer including second metal strands spirally wound around the insulator, and a shield tape layer including a shield tape including a resin tape and a metal layer provided on one side of the resin tape, the shield tape being spirally wound around the winding shield layer with the metal layer being located inwardly radially in such a manner that the metal layer is being in contact with the winding shield layer. The winding shield layer has a gap in at least one location between the second metal strands adjacent to each other in a circumferential direction, and a sum of distances w between the second metal strands adjacent to each other via the gap is not more than an outer diameter d of the second metal strand in a cross-section perpendicular to a longitudinal direction.

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