US2599857A - Method of manufacture of insulation for coaxial cables - Google Patents

Method of manufacture of insulation for coaxial cables Download PDF

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Publication number
US2599857A
US2599857A US721843A US72184347A US2599857A US 2599857 A US2599857 A US 2599857A US 721843 A US721843 A US 721843A US 72184347 A US72184347 A US 72184347A US 2599857 A US2599857 A US 2599857A
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United States
Prior art keywords
helix
insulation
membrane
conductor
helical
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Expired - Lifetime
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US721843A
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English (en)
Inventor
Mildner Raymond Charles
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Telegraph Construction and Maintenance Co Ltd
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Telegraph Construction and Maintenance Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/18—Applying discontinuous insulation, e.g. discs, beads
    • H01B13/20—Applying discontinuous insulation, e.g. discs, beads for concentric or coaxial cables
    • H01B13/206—Applying discontinuous insulation, e.g. discs, beads for concentric or coaxial cables by forming a helical web
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1834—Construction of the insulation between the conductors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/11—Bias [i.e., helically] cutting of tubular stock
    • Y10T29/1194—Method
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y10T29/49382—Helically finned
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means
    • Y10T29/49378—Finned tube
    • Y10T29/49384—Internally finned

Definitions

  • This invention relates to improvements in air space electric cables.
  • the efiective permittivity of the cable insulant should be made as low as possible in order to achieve a high efficiency of transmission. In practice this means that as little solid insulation material as possible should be used, particularly at the parts which are subjected to the highest electrical stresses, that is, near the inner conductor or conductors. It is also important that the insulation should be uniform throughout the length of the cable, so as to reduce the electrical reflections from points of discontinuity to a minimum. Such discontinuities might be caused by a change in the effective permittivity of the insulation at points along the cable length, or by changes in the relative dimensions of the inner and outer conductors.
  • a further principle of design lies in the requirement that the inner conductor or conductors should be mechanically coupled, both closely and uniformly along the length, to the outer conductor, so as to minimis relative movement of the conductors by reason of handling or differential thermal expansion. In practice these various requirements are conflicting, and practical designs attempt to achieve a compromise.
  • One known method of constructing a cable which partly achieves the desirable characteristics noted above, is as follows: The inner conductor is lapped with a circular thread of insulatmg material of about 1 mm. diameter and a pitch of about 2 cm. This assembly is then provided with an extruded outer sleeve of flexible plastic material, which serves the purposes of locking the thread assembly, giving the cable construction a measure of robustness and providing a watertight covering. 7
  • the present invention has for its object a method of producing, in helicalform, a membrane-lik thread which can be used in the construction of an air space cable having greatly improved characteristics, both electrical and mechanical, over other constructions hitherto proposed. Furthermore thereare no practical limitations to the length of cable which can be produced in this way.
  • helical strip insulation material for use in the manufacture of an electric cable of the air space type is obtained by the application to a former of predetermined size of a layer of dielectric material, cutting the layer into a short pitch helix, and then separating the helix so formed.
  • a former or support which is of the same or substantially the same diameter as the central conductor or coil of the cable to be constructed has applied, such as by extrusion, a layer of dielectric material, and from this layer is obtained by cutting a shortpitch helix, which, after removal from th former. and the necessary expansion,is preferably subjected to heat treatment to remove any stress set up by the expansion from a short pitch to an open pitch helix.
  • the helical membrane may be directly mounted on the inner conductor or applied over a layer of insulation previously applied to the conductor.
  • two helical membranes may be used, the innermost membrane being locked in position on the central conductor by an extruded layer of insulation and over which the outer membrane is applied.
  • the outer conductor is applied direct to the dielectric membrane or over an extruded sleeve of insulation.
  • thehelical membrane is used to locate the conductors and for this purpose is preferably provided with edge slots to accommodate each conductor, the latter being locked in their relative positions by securin means, which may conveniently consist of a second helical-membrane.
  • Figure 1 is-an elevation showing the former or support with a layer of dielectric and the method of cutting a helical membrane thereon.
  • Figure 2 is an elevation showing a short length of helical membrane after removal of the support and after it has been extended to' increase the pitch and as in the final cable-assembly.
  • Figures 3, 4 and 5 am end views of the helical membrane with different formsof locating slots for'use'in the manufacture of a multioonductc-r cable.
  • Figures 6, '7 and 8 are longitudinal sectional views of three different types of coaxial cable constructions builtup with the membrane or membranes of this invention, Figures 6a, 7a, 8a being end views thereof.
  • Figures 9, 10 and 11 are views in elevation illustrating the applicationof the helical membrane to multiconductor cables, Figures 9a, 10a, and llabeing end views thereof.
  • Figure 12 is apart sectional elevation'illustrating a device for relieving the stressin an extended helical membrane.
  • a layer of insulation I is applied'by extrusion or other known; means toa central support-2', which*may consist of wire or rod.
  • the size ofthe'support will of course be varied to suit requirements-but it is substantially of the same diameter as thecentral conductor or core to which thehelicalmembrane is subsequently to'be applied.
  • the insula- 'tion may consist of polythene, polytet-rafiuoroethylene, polystyrene or othersuitable dielectric.
  • the insulating cover may be made to conform acourately to the desired dimensions by known methods.
  • the inner diameter as represented by .7 may be made to conform closely to that of the support by cooling the core so formed slowly as it issues from the extruder, or'by the ap plication-of external pressure as it cools.”
  • "lhe outerdiameter as represented by-y' may beadjusted to any desired accuracy by shaving itwith a cutting tool in a subsequent operation.
  • 'Thezinsulatedcore is then given a fine helicalout 3 of very short pitch through the insulating layeras far as the support. At the same time it is parted from the support 2 across the narrow section where it may be adhering.
  • the helical thread i so" formed is now unwound from the support by rotatingthe free end at a predetermined rate around'the latter, in such a manner that it relayer of insulation 6 applied by extrusion in the form of a sleeve which acts to lock the inner conductorand its surrounding thread or membrane 4 into fixed relationship with one another.
  • outer conductor 1 is then applied over the insulation sleeved.
  • Aprotective sheath 8 i applied over the conductor 7 to protect the conductor from corrosion and-moisture.
  • the outer conductor may be of braided conducting wires, metal tape either helically or longitudinally applied, a lead sheath or some other desired form of semi-flexible conducting cylinder.
  • the cable may be comprised of several layers of helical membrane, separated by extruded longitudinal.orlapped corerings in the case where the diameter ratioof outer to inner conductor is very large. lThe direction of lay may be reversed with successive layers, in which case the separators. may :be omitted.
  • Fla which illustrate a coaxialcable constructedfin:accordance with the invention, two'helices, an innerxhelixQand an outer helix it, are wrappedxaround acentral conductor H, being separatedbyian extruded insulating covering 12,.and encloseclbyanrextruded outer conductor .ltiwhi'ch may'beza lead sheath.
  • FIG. 8a a central conductor H ,:provided' with ;.a'.ilayer. of insulation M, over'which the helical membrane 4 is applied, an outer-conductor I5,1consisting of a layer of tape folded longitudinally;beingrdirect lysupported by .the membrane. 17- is'a waterproof covering.
  • This form of thezinvention is particularly applicable to cable constructions de-.- signed to have a low. capacitance,:necessitating a central conductor. ofsmall diameter. :Byxuse of an inner insulation layer M, the inherentweakness of the conductor is. overcome andza better looking efiect is secured between the membrane and the central core by reason ofthe increased diameter.
  • v helical, membrane construction may be used in:conjuncticn-zwithzother.:kncwn forms of cable-insulation.
  • the inner conductor may first be-spiralled with a'circular thread of suitable insulating material and then the'helical membrane may be-applied thereon.
  • the helical membrane may beapplied over or under a disc-spaced construction.
  • the helical membrane may. also? be-applied to the construction. of multi-conductor. cables, two ormore slots being out. in the peripheryofthe core illustrated in Figurel prior lt oeelongating the membrane. These slots mayrber cut-longitudinally or helically. :The conductorsiare laid in the slots and locked in position by :means; of an insulating thread or by means. ofa-- second helical membrane. The helical membranesupporting the conductors may :conveniently .be wound on acentral insulating-rod v or. tube so; as to provide a ooherentrstructurezon whichtozassemble the conductors and to define precisely the lay of the helix.
  • the cable is built up on a central tube l9'of insulating material carrying a helical membrane I8 provided with deep slots to locate the conductors 2
  • the central tube l9 supports a helix I-8 which is similarly slotted to receive the conductors 2
  • a helical membrane 25 having shallow slots 26 is supported by the insulating tube
  • are locked in position by a second and outer helix 29.
  • the extension of the thread from its position when out as shown in Figure 1 to its final form in Figure 2 sets up some strain in the plastic material.
  • the ratio of the outer to inner diameter of the thread is low and the ratio of the final pitch of the membrane thread to its thickness is not excessive, this strain can be accommodated by a distortion of the membrane formed by the thread.
  • the strain involved may be excessive and it may be necessary to carry out a further forming process.
  • the thread is extended approximately to its final pitch and is then passed between hot rollers which raise the temperature of the material to its softening point but well below its melting point.
  • the temperature is not critical because in all practical cases the required strain should not exceed about 10 to 15%.
  • the device comprises essentially a revolving tube 3
  • are revolving conical rollers 35, between which the helical membrane 33 is fed.
  • Rollers 35 are fast on spindles 39 journalled in bearings 36 in the tube, which is formed with an increased wall thickness or shouldered portion 40 for this purpose and to provide a circumferential bearing 4
  • the annulus 42 is formed on its opposite faces with rack teeth 44 which are in driving engagement with bevel pinions 45 on the roller spindles 3%.
  • slip rings 46, 41 Located on opposite sides of the rollers 35 are slip rings 46, 41 for the introduction through corresponding apertures 48, 49 of hot and cold air respectively for heating and cooling the membrane.
  • the membrane 30 is fed in the direction of the arrows through the tube interior, being guided by a series of rollers 50 located downstream and upstream of the driven rollers 35, rollers 50 being freely mounted on studs 5
  • cables having a wide range of electrical and mechanical characteristics can be designed by using a membrane construction in accordance with the present invention.
  • the effective permittivity can, for a given robustness, be made lower than by the use of conventional constructions.
  • a method for the manufacture of insulation material for use in an electric cable including inner and outer conductors and an interposed helix of solid insulation; said method comprising extruding upon a former of predetermined size substantially the same as the size of the inner conductor to which the material is to be applied a layer of dielectric material of sufficient inherent rigidity to provide, when formed as a short pitch helix and subsequently extended, effective mechanical connection of the inner and outer conductors, helically cutting the dielectric material of said layer into a short pitch helix of solid insulation having a prescribed internal dimension corresponding to the external dimension of the inner conductor, and extending said short pitch helix.
  • a method for the manufacture of insulation material for use in an electric cable including inner and outer conductors and an interposed helix of solid insulation; said method comprising extruding upon a former of predetermined size substantially the same as the size of the inner conductor to which the material is to be applied a layer of dielectric material of sufficient inherent rigidity to provide, when formed as a short pitch helix having convolutions of substantially greater radial dimension from inner to outer diameter than axial thickness, effective mechanical connection of the inner and outer conductors,
  • a method for the manufacture of insulation material for use in an electric cable including inner and outer conductors and an interposed helix of solid insulation; said method comprising extruding upon a former of predetermined size substantially the same as the size of the inner conductor to which the material is to be applied a layer of dielectric material of such inherent rigidity that when out helically into a short pitch helix and separated from the former the helix will have an internal dimension substantially constant throughout the length of the helix so as to enable said helix to provide effective mechanical connection between the inner and outer conductors, and helically cutting the dielectric V material of said layer into a short pitchhelix.
  • a method for the manufacture of insulation material for use in an electric cable including inner and outer conductors and an interposed helix of solid insulation; said method comprising extruding upon a former of predetermined size substantially the same as the size of the inner conductor to which the material is to be applied a layer of dielectric material of sufficient inherent rigidity to provide, when formed as a helix having convolutions of substantially greater radial d1- mensinn Imm inner to hopper. diameter than ,ex iel thickness. emotive smechanicaiconnection of the inner and outerconduc o s; helically cutting. th dielectric material of said layer intoa Short pitch helix having ,convolutians of substantially reater radial.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Communication Cables (AREA)
  • Waveguides (AREA)
US721843A 1946-01-18 1947-01-13 Method of manufacture of insulation for coaxial cables Expired - Lifetime US2599857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1721/46A GB608147A (en) 1946-01-18 1946-01-18 Improvements in or relating to electric cables

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US (1) US2599857A (enrdf_load_stackoverflow)
GB (1) GB608147A (enrdf_load_stackoverflow)
NL (1) NL70908C (enrdf_load_stackoverflow)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2797394A (en) * 1951-03-07 1957-06-25 Bell Telephone Labor Inc Electrical conductor having composite central dielectric member
US2847499A (en) * 1954-06-16 1958-08-12 Preformed Line Products Co Coaxial cable
US2908535A (en) * 1957-10-24 1959-10-13 Russell Mfg Co Oilless antifriction bearings
US2999525A (en) * 1958-09-22 1961-09-12 Carl A Mercer Tube-perforating mechanism
US3146297A (en) * 1960-02-25 1964-08-25 Felten & Guilleaume Carlswerk Coaxial cable with helical insulating spacer
US3545063A (en) * 1968-12-17 1970-12-08 John E Mitchell Co Inc Method of assembling an evaporator having a helical channel
US4011118A (en) * 1974-05-21 1977-03-08 U.S. Philips Corporation Method of manufacturing a coaxial cable, and coaxial cable made by this method
US4018977A (en) * 1975-08-04 1977-04-19 Amp Incorporated High voltage cable with air dielectric
US4661184A (en) * 1985-10-02 1987-04-28 Klaey Hans Method of and means for producing a helical band
US5262593A (en) * 1991-03-09 1993-11-16 Alcatel N.V. Coaxial electrical high-frequency cable
EP0582013A3 (enrdf_load_stackoverflow) * 1991-07-09 1994-04-13 Flexco Microwave Inc
US5811734A (en) * 1992-05-29 1998-09-22 Holec Systemen En Componenten B.V. Bus-bar conductor system for high voltage systems
US6346671B1 (en) * 1997-08-29 2002-02-12 Alcatel Coaxial high-frequency cable
US6849799B2 (en) * 2002-10-22 2005-02-01 3M Innovative Properties Company High propagation speed coaxial and twinaxial cable
US20070267717A1 (en) * 2006-05-22 2007-11-22 Andrew Corporation Coaxial RF Device Thermally Conductive Polymer Insulator and Method of Manufacture
US20090183895A1 (en) * 2008-01-23 2009-07-23 Vivant Medical, Inc. Thermally Tuned Coaxial Cable for Microwave Antennas
US9355755B2 (en) 2011-04-07 2016-05-31 3M Innovative Properties Company High speed transmission cable
US20160155535A1 (en) * 2014-11-27 2016-06-02 Hitachi Metals, Ltd. Coaxial cable and medical cable using the same
US20160336091A1 (en) * 2015-05-15 2016-11-17 At&T Intellectual Property I, Lp Transmission medium having a conductive material and methods for use therewith
US10679767B2 (en) 2015-05-15 2020-06-09 At&T Intellectual Property I, L.P. Transmission medium having a conductive material and methods for use therewith
US10839981B2 (en) 2011-04-07 2020-11-17 3M Innovative Properties Company High speed transmission cable
US11715583B2 (en) * 2020-03-06 2023-08-01 AFC Cable Systems, Inc. MC cable with tearable assembly tape
CN118248394A (zh) * 2024-05-27 2024-06-25 湖南广顺电缆有限公司 一种耐寒、耐高温特种结构新能源风力电缆及其生产设备

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE503166A (enrdf_load_stackoverflow) * 1950-05-16
FR1053867A (fr) * 1950-05-16 1954-02-05 Telegraph Constr & Maintenance Procédé et dispositif de fabrication de câbles électriques à isolement par couche d'air
DE1193665B (de) * 1959-03-09 1965-05-26 Telegraph Constr & Maintenance Vorrichtung zum Herstellen gewendelter isolierender Abstandhalter

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1849928A (en) * 1928-12-15 1932-03-15 Nat India Rubber Co Apparatus for cutting rubber
US1864903A (en) * 1932-01-11 1932-06-28 Jenkins Bros Machine for cutting rings
US1885168A (en) * 1929-05-23 1932-11-01 American Telephone & Telegraph Concentric conducting system
US2012833A (en) * 1932-11-10 1935-08-27 American Brakeblok Corp Machine for making friction elements
US2045471A (en) * 1936-04-24 1936-06-23 Louis A Kasen Method of producing molded articles from casein
US2131987A (en) * 1932-10-24 1938-10-04 Norddeutsche Seekabelwerke Ag Electric cable with air space insulation
US2154430A (en) * 1936-02-14 1939-04-18 Alfred J Berg Heat exchanging element and process of making the same
US2204737A (en) * 1937-10-14 1940-06-18 Ici Ltd Manufacture of electric cables
US2206262A (en) * 1938-08-11 1940-07-02 Crown Cork & Seal Co Pack of gaskets
US2211760A (en) * 1937-12-08 1940-08-20 Alfred J Berg Spring and method of making the same
US2317409A (en) * 1940-01-05 1943-04-27 Goodrich Co B F Method for stress-relieving plastics
US2343079A (en) * 1941-12-22 1944-02-29 Gen Motors Corp Coupling
US2370265A (en) * 1940-08-01 1945-02-27 Richard W Shoemaker Apparatus for the manufacture of helical heat exchange fins

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1849928A (en) * 1928-12-15 1932-03-15 Nat India Rubber Co Apparatus for cutting rubber
US1885168A (en) * 1929-05-23 1932-11-01 American Telephone & Telegraph Concentric conducting system
US1864903A (en) * 1932-01-11 1932-06-28 Jenkins Bros Machine for cutting rings
US2131987A (en) * 1932-10-24 1938-10-04 Norddeutsche Seekabelwerke Ag Electric cable with air space insulation
US2012833A (en) * 1932-11-10 1935-08-27 American Brakeblok Corp Machine for making friction elements
US2154430A (en) * 1936-02-14 1939-04-18 Alfred J Berg Heat exchanging element and process of making the same
US2045471A (en) * 1936-04-24 1936-06-23 Louis A Kasen Method of producing molded articles from casein
US2204737A (en) * 1937-10-14 1940-06-18 Ici Ltd Manufacture of electric cables
US2211760A (en) * 1937-12-08 1940-08-20 Alfred J Berg Spring and method of making the same
US2206262A (en) * 1938-08-11 1940-07-02 Crown Cork & Seal Co Pack of gaskets
US2317409A (en) * 1940-01-05 1943-04-27 Goodrich Co B F Method for stress-relieving plastics
US2370265A (en) * 1940-08-01 1945-02-27 Richard W Shoemaker Apparatus for the manufacture of helical heat exchange fins
US2343079A (en) * 1941-12-22 1944-02-29 Gen Motors Corp Coupling

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2797394A (en) * 1951-03-07 1957-06-25 Bell Telephone Labor Inc Electrical conductor having composite central dielectric member
US2847499A (en) * 1954-06-16 1958-08-12 Preformed Line Products Co Coaxial cable
US2908535A (en) * 1957-10-24 1959-10-13 Russell Mfg Co Oilless antifriction bearings
US2999525A (en) * 1958-09-22 1961-09-12 Carl A Mercer Tube-perforating mechanism
US3146297A (en) * 1960-02-25 1964-08-25 Felten & Guilleaume Carlswerk Coaxial cable with helical insulating spacer
US3545063A (en) * 1968-12-17 1970-12-08 John E Mitchell Co Inc Method of assembling an evaporator having a helical channel
US4011118A (en) * 1974-05-21 1977-03-08 U.S. Philips Corporation Method of manufacturing a coaxial cable, and coaxial cable made by this method
US4018977A (en) * 1975-08-04 1977-04-19 Amp Incorporated High voltage cable with air dielectric
US4661184A (en) * 1985-10-02 1987-04-28 Klaey Hans Method of and means for producing a helical band
US5262593A (en) * 1991-03-09 1993-11-16 Alcatel N.V. Coaxial electrical high-frequency cable
EP0582013A3 (enrdf_load_stackoverflow) * 1991-07-09 1994-04-13 Flexco Microwave Inc
US5811734A (en) * 1992-05-29 1998-09-22 Holec Systemen En Componenten B.V. Bus-bar conductor system for high voltage systems
US6346671B1 (en) * 1997-08-29 2002-02-12 Alcatel Coaxial high-frequency cable
US6849799B2 (en) * 2002-10-22 2005-02-01 3M Innovative Properties Company High propagation speed coaxial and twinaxial cable
US20070267717A1 (en) * 2006-05-22 2007-11-22 Andrew Corporation Coaxial RF Device Thermally Conductive Polymer Insulator and Method of Manufacture
US7705238B2 (en) * 2006-05-22 2010-04-27 Andrew Llc Coaxial RF device thermally conductive polymer insulator and method of manufacture
US20100101825A1 (en) * 2008-01-23 2010-04-29 Vivant Medical, Inc. Thermally Tuned Coaxial Cable for Microwave Antennas
US7642451B2 (en) * 2008-01-23 2010-01-05 Vivant Medical, Inc. Thermally tuned coaxial cable for microwave antennas
US20090183895A1 (en) * 2008-01-23 2009-07-23 Vivant Medical, Inc. Thermally Tuned Coaxial Cable for Microwave Antennas
US8258399B2 (en) * 2008-01-23 2012-09-04 Vivant Medical, Inc. Thermally tuned coaxial cable for microwave antennas
US20120325516A1 (en) * 2008-01-23 2012-12-27 Vivant Medical, Inc. Thermally Tuned Coaxial Cable For Microwave Antennas
US8969722B2 (en) * 2008-01-23 2015-03-03 Covidien Lp Thermally tuned coaxial cable for microwave antennas
US20150129302A1 (en) * 2008-01-23 2015-05-14 Covidien Lp Thermally tuned coaxial cable for microwave antennas
US9305682B2 (en) * 2008-01-23 2016-04-05 Covidien Lp Thermally tuned coaxial cable for microwave antennas
US10354778B2 (en) 2011-04-07 2019-07-16 3M Innovative Properties Company High speed transmission cable
US9799425B2 (en) 2011-04-07 2017-10-24 3M Innovative Properties Company High speed transmission cable
US9355755B2 (en) 2011-04-07 2016-05-31 3M Innovative Properties Company High speed transmission cable
US10726970B2 (en) 2011-04-07 2020-07-28 3M Innovative Properties Company High speed transmission cable
US10839981B2 (en) 2011-04-07 2020-11-17 3M Innovative Properties Company High speed transmission cable
US20160155535A1 (en) * 2014-11-27 2016-06-02 Hitachi Metals, Ltd. Coaxial cable and medical cable using the same
US9659683B2 (en) * 2014-11-27 2017-05-23 Hitachi Metals, Ltd. Coaxial cable and medical cable using the same
US20160336091A1 (en) * 2015-05-15 2016-11-17 At&T Intellectual Property I, Lp Transmission medium having a conductive material and methods for use therewith
US10650940B2 (en) * 2015-05-15 2020-05-12 At&T Intellectual Property I, L.P. Transmission medium having a conductive material and methods for use therewith
US10679767B2 (en) 2015-05-15 2020-06-09 At&T Intellectual Property I, L.P. Transmission medium having a conductive material and methods for use therewith
US11715583B2 (en) * 2020-03-06 2023-08-01 AFC Cable Systems, Inc. MC cable with tearable assembly tape
CN118248394A (zh) * 2024-05-27 2024-06-25 湖南广顺电缆有限公司 一种耐寒、耐高温特种结构新能源风力电缆及其生产设备

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Publication number Publication date
NL70908C (enrdf_load_stackoverflow)
GB608147A (en) 1948-09-10

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