US3737997A - Continuous manufacture of shielded conductors - Google Patents
Continuous manufacture of shielded conductors Download PDFInfo
- Publication number
- US3737997A US3737997A US00054405A US3737997DA US3737997A US 3737997 A US3737997 A US 3737997A US 00054405 A US00054405 A US 00054405A US 3737997D A US3737997D A US 3737997DA US 3737997 A US3737997 A US 3737997A
- Authority
- US
- United States
- Prior art keywords
- tube
- shielded
- conductors
- strip
- conductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000004020 conductor Substances 0.000 title claims abstract description 93
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims abstract description 31
- 238000004140 cleaning Methods 0.000 claims abstract description 23
- 238000009413 insulation Methods 0.000 claims abstract description 19
- 239000011810 insulating material Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000000151 deposition Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 4
- 230000008021 deposition Effects 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 239000012671 ceramic insulating material Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims 2
- 229910001220 stainless steel Inorganic materials 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000003860 storage Methods 0.000 abstract description 5
- 230000003749 cleanliness Effects 0.000 abstract description 4
- 238000010292 electrical insulation Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000008188 pellet Substances 0.000 description 22
- 238000010586 diagram Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 210000004243 sweat Anatomy 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000809 Alumel Inorganic materials 0.000 description 1
- 241000239290 Araneae Species 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical class [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004814 ceramic processing Methods 0.000 description 1
- 229910001179 chromel Inorganic materials 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000011346 highly viscous material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- -1 strip stock Substances 0.000 description 1
Images
Classifications
-
- 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
- H01B13/004—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing rigid-tube cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/16—Rigid-tube cables
-
- 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
- Y10T29/49002—Electrical device making
- Y10T29/49082—Resistor making
- Y10T29/49087—Resistor making with envelope or housing
-
- 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
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
Definitions
- ABSTRACT A method of making continuous lengths of a shielded electrical conductor having a rigid exterior sheath and at least one conductor element held in place therein and surrounded by finely divided and compacted electrical insulation.
- a supply of metal strip material is continuously removed from a storage roll, and cleaned and positioned by a guide so that, as the strip is formed into a tube, the tube will surround one or more wires or conductive elements which are simultaneously being removed from a storage roll, cleaned, and positioned within the tube being formed by another portion of the guide.
- the insulating material is cleaned and deposited continuously on the strip material from which the tube is being formed, so that the tube will enclose the insulation, and the insulation will in turn aid in positioning the wire within the tube.
- the entire conductor is reduced in diameter to compact further the insulation.
- the formed lengths may thereafter be cut to desired lengths for use as shielded cable, electrical resistance heating elements or thermocouples for temperature detection.
- Interior tube cleanliness is critical in shielded conductors; the method of the invention enables cleaning to be made more effective and consistent, and to be greatly simplified, and also permits high quality shielded conductors of virtually unlimited length to be made at low cost.
- thermocouple hot junction may be formed by joining together the adjacent ends of two extremely long electrical conductors sheathed within a continuous tube or shield and electrically insulated from each other and from the sheath.
- thermocouples in the form of long probes for temperature detection in inaccessible regions are well known, and, because of their inherent simplicity and reliability, such thermocouples are very commonly used in a wide variety of industrial applications, including steel making installations, oil refineries,
- Shielded conductors are also commonly used as electrical resistance heating elements and the like, and as sheathed cable for other applications.
- One common prior art method of forming metal sheathed, metallic oxided insulated conductors and the like includes the steps of inserting wires or like conductors through axially extending openings in preformed, generally cylindrical oxide pallets, and inserting the wires and pellets as a unit into a carefully cleaned, previously formed tube, and then reducing the diameter of the tube to compact the oxide around the wires to insulate them electrically and position them in a desired, spaced apart relation from each other and from the sheath formed by the tube.
- the axial openings in the pellets would be several thousandths of an inch larger than the diameter of the wires, and the oxide pellets, which were customarily formed in one to six inch lengths, had an outside diameter which was a few thousandths smaller than the inside diameter of the tube so that the pellets could be inserted into the tube without difficulty.
- manufacture of substantial lengths of shielded conductor involve stringing the wire or other conductor through a long succession of pellets, and then inserting there pellets in succession into the preformed and precleaned tube.
- a similar method is commonly used for making shielded conductors having only a single wire or other conductor, such a wire being normally centrally disposed within the pellet for best insulation value by reason of maximum spacing from the tubular sheath.
- Another method which is commonly used to manufacture shielded conductors and the like is to provide a given length of tube and to position it vertically within a vibratory holder, and thereafter insert one or more commonly used in the preparation of electrical resistance heating elements.
- the tube may be further reduced, as by a drawing operation, and the oxide may be thereafter baked at a high temperature, typically l,800 F. or more.
- thermocouple stock or shielded cable it has been found necessary in the shielded conductor industry to place great emphasis on cleaning of the interior of the tube immediately prior to manufacture of the composite element such as the shielded cable or thermocouple stock.
- oxide pellets or cylinders In those methods wherein the oxide pellets or cylinders are used, it is common to manufacture these pellets by wet mixing and extruding the material through a spider die. Extrusion produces a self-sustaining, highly viscous material of a consistency somewhat'like that of a wet noodle; this material is then commonly cut into approximately 12 inch lengths and baked or fired while held in the V groove of an appropriate ceramic processing tray.
- each one foot length of pellet material is further cut into pieces of a three inch or less length, with these individual pieces being examined for correct dimensions, including the size of the opening therein, the outside diameter, roundness and location of the openings.
- the oxide has picked up impurities, even in trace amounts such as the salt in sweat from human hands, the resulting heat treatment will fuse the sodium chloride into a form which will produce a high resistance short circuit path within the finished assembly.
- thermocouple stock, cable, or heating rod assembly is very great in relation to the cost of raw materials used to manufacture it.
- Another object is to provide a method of making shielded conductors which is characterized by extremely low cost of manufacture.
- Another object is the provision of a method which is not inherently limited as to the length of conductor able to be made thereby.
- a still further object is the provision of a method for making shielded conductors which makes it possible to achieve superior cleanliness of components at reduced cost in comparison to prior art methods of making sufficiently clean conductors.
- a further object is the provision of a method wherein the manufacturer's requirements of component inventory may be greatly reduced, and may be limited to bulk quantities of oxide powder, strip stock, and conductor elements.
- a still further object is the provision of a method of making insulated conductors in which the number of
- a further object is the provision of a continuous manufacturing method for shielded conductors wherein one or more wire conductors are held in tension in a fixed relationship to a tube which is continuously ,being formed from flat stock in a desired location around the conductors after insulating material is placed within the tube being formed.
- Another object is the provision of a method wherein a large, continuous supply of sheath stock is continuously cleaned while in a flat condition and is shortly thereafter formed into a tubular shape for welding so as to enclose one or more wires or like conductors disposed therein.
- Another object is the provision of a method wherein wire conductors to be enclosed within a shielded conductor or cable may be cleaned immediately prior to I their incorporation into the finished product.
- FIG. 1 is a perspective view, partly diagrammatic, showing an apparatus which is adapted to perform the method of the invention, and including means for forming a tubular sheath, positioning conductors therein,
- Still another object is the provision of a method malfunctions.
- FIG. 2 is a block diagram showing the principal steps of the method of the invention.
- FIG. 3 is an axial view, taken generally along lines.
- FIG. 1 A first figure.
- the apparatus 8 also includes means 22 for continuously supplying finely subdivided insulating material to the strip as it is being formed into a tube, means 24 for forming a tube from the strip, and means 26 for reducing the diameter of the tube thus formed and thereby compacting the electrical insulation therein.
- the strip supply means is in the form of a roll 28 which is rotatable about an axis defined by the axle 30, and which contains a continuous length of a metal strip material 32 to which further reference will be made later.
- the strip cleaner 18, which is shown in diagrammatic form in a preferred form of the invention, is preferably an ultrasonic cleaner of a known type. While the exact construction of such cleaner does not form a novel part of the invention per se, and may be of any construction suitable to accomplish the result of cleaning and drying the strip of material 32, one preferred form of such unit has plural guide rollers and one or more solvent or other cleaning baths through which ultrasonic energy is communicated to the strip for cleaning the same. Ordinarily, the cleaner 18 also includes means for rinsing and drying the strip material 32. After emerging from the cleaner 18, the strip material passes through the positioning assembly 20 in a manner to be set forth in further detail herein.
- the shielded conductor to be manufactured will be a length of tubing having a pair of conductors in the form of two wires, held in insulated relation to each other and to the tube, and joined at their ends to form a thermocouple hot junction
- the means 12 and 14 for supplying the conductors will be in the form of reels 36, 38, rotatably positioned on a common axis by means of an axle 34, with each reel 36, 38 having a supply of wire 40, 42 or like electrical conductor thereon.
- the cleaner 16 for the wires 40, 42 is a unit similar to the ultrasonic cleaning apparatus 18 used for the strip 32, that is, it may include one or more cleaners or solvents in liquid form disposed in tanks through which the wires 40, 42 are passed while the solution within the cleaner 16 is being agitated by the application thereto of ultrasonic energy such as by an electromechanical transducer in a mann er well known in the art.
- the strip 32 and the wires 40, 42 simultaneously emerge from the ultrasonic cleaning units 18, 16 respectively, and enter the positioning or guiding means 20, which serves to position the strip 32 for subsequent passage between opposed sets of hourglass rollers 46 which are positioned radially and axially of the strip 32 so as to form it into a tube 44; the guiding means 20 also serves to position the wires 40, 42 so that they are disposed generally centrally of the tube 44-being formed. In this manner, the wires 40, 42 will be generally disposed centrally of, but still spaced apart from the walls of the tube 44, as well as spaced apart from each other.
- this unit 22 will be seen to include a hopper 54 having a heating unit 56 associated therewith and electrical cables 58 for supplying power thereto. Powdered insulation passing through the heater 56 is dried, and deposited on the strip 32 from a discharge nozzle 60 having an end portion 62 disposed immediately adjacent the rollers 46 forming the tube 44 from the strip 32.
- the hopper 54 includes means (not shown) for controlling the flow or rate of deposition of insulating material 64 on the tube 44 being formed. Further disclosure of such flow control means is believed unnecessary, since such means are well known in and of themselves and do not form a part of the invention which is novel per se.
- the guide 20 includes a body portion 66 having, in the lower portion thereof, inwardly directed wall portions 68 defining an aligning slot 70 for the passage of the strip 32, which is to be formed into the configuration of a tube 44 after leaving the guide 20.
- a pair of tapered bores 72, 74 Positioned axially generally centrally of the body 66 and hence the tube 44 are a pair of tapered bores 72, 74 each having a forward outlet 76 for guiding wire 40 passing therethrough.
- the number and disposition of the bores 72, 74 may be suitably altered.
- the dimensions and the position of the slot 70 may be varied according to the thickness of the material to be used and the intended diameter of the tube to be formed therefrom.
- the guide 20 may be secured in position in relation to the other elements of the apparatus by conventional means (not shown) which permit ready removal and replacement thereof.
- FIGS. '1 and 5 the manner in which the process of the invention is first started is somewhat schematically illustrated.
- a tube 44 having two conductors 40, 42 positioned therein is desired to be made
- a short length of the strip 32 is fed through the guide 20 and through the rollers 46 so as to be welded into a tube 44, and the front end portion 78 thereof is then passed a short distance through the reducing die 26.
- the insulating material 64' is not allowed to flow into the strip 32.
- the strip 32 may again be advanced through the rollers 46 with the tube forming means 24 including the welder 48 being actuated, and the insulation 64 being fed from the hopper 54 through the end 62 of the nozzle 60, and onto the strip 32. It will be appreciated that, assuming that sufficient insulation 64 is placed on the strip 32 to substantially fill the tube 44, upon reducguide. for maintaining accurate positioning of the wires 40, 42 within the tube 44 during continuous tube formation.
- the supply of one or more wires and the supply of tube material are fed to the wire and sheet material guide or positioning means at a controlled rate after being cleaned respectively by associated cleaning units.
- the tube is thereafter partially formed, during which the insulating material is supplied thereto, and thereafter, the complete tubular shape is imparted to the sheet of material, which is held by the hourglass rolls, as pointed out above, until welding thereof is complete. Thereafter, tube is reduced in diameter and the insulation is compacted by passing the tube containing the insulation and wires through the reducing die 26.
- One of the number of advantages provided by the present invention is that only a minimum number of sizes of strip material and only a minimum number of sizes of conductors 40, 42 need be kept on hand in the manufacturers inventory.
- the insulation material may be purchased and stored in bulk form, and, if chemically pure (C.P.), it needonly be dried before being supplied to the strip before the tube 44 is formed. Consequently, the previously used methods and apparatus for manufacturing oxide pellets need not be used, and
- thermocouple probe of the shielded conductor type Referring now to some of the materials which are preferably used to make shielded conductors according to the invention, assuming that it is desired to make a thermocouple probe of the shielded conductor type,
- the strip material may be a number 304 stainless steel
- one of the wire conductors may be an Alumel (aluminum-nickel alloy) wire and the other a Chromel (chromium-nickel alloy) wire.
- the insulation may be a finely subdivided (200 mesh) chemically pure, anhydrous metallic oxide, such as magnesium oxide.
- one or more high resistance wires such as Nichrome (nickel-chromium alloy) wire may be used.
- a central wire core of a helical form may also be made by the method of the present invention.
- shielded conductors of this type were made by surrounding a helix of wire with an oxide pellet having a suitably sized central opening therein, placing a suitably sized solid oxide pellet within the helix of wire, then inserting the pellets and wire within the tube, and reducing the tube diameter to crush the oxide pellets and thereby compact the insulation and locate the wire in place within the tube.
- the method of the present invention also greatly simplifies manufacture of this type of shielded conductor.
- the present invention provides a novel method for the continuous manufacture of shielded conductors, and in particular, a method having a number of advantages and characteristics, including those pointed out herein and others which are inherent in the invention.
- a method of continuous manufacture of shielded electrical cable suitable for use in hot environments comprising positioning at least two continuous electrical conductor means spaced apart from each other, advancing said at least two electrical conductor means from a starting position through a given region lying generally forwardly and axially of the starting position while maintaining the spaced apart relationship, simultaneously moving a continuous length of said wire into said region, advancing a continuous strip of flat metal material past tube forming means so as to form a continuous tube therefrom in a position surrounding said given region, while concurrentlydepositing a sufficient amount of fluent ceramic insulating material on at least a portion of said strip for enclosure thereof within said tube to fill said'tube as said tube is formed, and thereafter advancing said tube, said insulation contained therein and said conductors through means for reducing the diameter of said tube and applying tension to said two conductors thereby maintaining the spaced apart conditions to compact said insulation and permanently position said two conductors therein in the spaced apart condition.
- said tube forming means includes a plurality of sets of hourglass rollers and welding means for permanently joining adjacent edges of saidflat material together.
- metal material comprises stainless'steel.
- said electrical conductor means comprises at least one electrical resistance heating element.
Abstract
Description
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US5440570A | 1970-07-13 | 1970-07-13 |
Publications (1)
Publication Number | Publication Date |
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US3737997A true US3737997A (en) | 1973-06-12 |
Family
ID=21990849
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US00054405A Expired - Lifetime US3737997A (en) | 1970-07-13 | 1970-07-13 | Continuous manufacture of shielded conductors |
Country Status (1)
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US (1) | US3737997A (en) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4212097A (en) * | 1977-05-04 | 1980-07-15 | Industrie Pirelli S.P.A. | Method and apparatus for manufacturing optical cable elements |
DE3004387A1 (en) * | 1979-02-08 | 1980-08-14 | Ass Elect Ind | DEVICE FOR PRODUCING MINERALLY INSULATED ELECTRICAL CABLES |
DE3004357A1 (en) * | 1979-02-08 | 1980-08-14 | Ass Elect Ind | METHOD AND DEVICE FOR PRODUCING MINERALLY INSULATED ELECTRIC CABLES |
EP0078675A2 (en) * | 1981-11-02 | 1983-05-11 | Xco International Incorporated | Heat sensitive cable and method of making same |
US4407065A (en) * | 1980-01-17 | 1983-10-04 | Gray Stanley J | Multiple sheath cable and method of manufacture |
US4540972A (en) * | 1981-11-02 | 1985-09-10 | Xco International, Inc. | Heat sensitive cable |
US4614024A (en) * | 1981-11-02 | 1986-09-30 | Xco International, Inc. | Method of manufacturing heat sensitive cable |
US4638107A (en) * | 1983-10-14 | 1987-01-20 | Xco International, Inc. | Heat sensitive tape and method of making same |
US4647710A (en) * | 1982-02-26 | 1987-03-03 | Xco International, Inc. | Heat sensitive cable and method of making same |
US4734981A (en) * | 1986-04-16 | 1988-04-05 | Kabelmetal Electro Gmbh | Method and apparatus for manufacturing hollow tubular members |
EP0573313A2 (en) * | 1992-06-05 | 1993-12-08 | BICC Public Limited Company | Mineral insulated electric cable manufacture |
GB2292634A (en) * | 1994-08-25 | 1996-02-28 | Oliver Sanders Johnson | Mineral insulated cable manufacture |
US6148925A (en) * | 1999-02-12 | 2000-11-21 | Moore; Boyd B. | Method of making a conductive downhole wire line system |
USRE37283E1 (en) | 1993-11-26 | 2001-07-17 | Erhard Luther Edgar Kluth | Apparatus for the remote measurement of physical parameters |
US6367510B1 (en) * | 2000-06-02 | 2002-04-09 | Eric Carlson | Tubing product having a helical support bead with lumen and method |
WO2003040674A1 (en) * | 2001-09-21 | 2003-05-15 | Davis Bayard C | Apparatus and method for manufacturing temperature sensitive cable |
US20030172752A1 (en) * | 1996-03-29 | 2003-09-18 | Kluth Erhard Luther Edgar | Apparatus for the remote measurement of physical parameters |
US20040118580A1 (en) * | 2002-12-20 | 2004-06-24 | Commscope Properties, Llc | Method and apparatus for manufacturing coaxial cable with composite inner conductor |
US20090065119A1 (en) * | 2002-09-11 | 2009-03-12 | Daniel John Smith | Method of forming a conduit |
US20110001314A1 (en) * | 2009-07-01 | 2011-01-06 | Xerox Corporation | Security codes within scratch-off layers and method of embedding thereof |
US20150245548A1 (en) * | 2014-02-26 | 2015-08-27 | Sparton Corporation | Control of electric field effects in a printed circuit board assembly using embedded nickel-metal composite materials |
CN105016107A (en) * | 2015-07-31 | 2015-11-04 | 宁波东方电缆股份有限公司 | Unwinding device for colored bar for color separation of cable special-shaped conductor |
US20160316553A1 (en) * | 2014-02-26 | 2016-10-27 | Sparton Corporation | Control of electric field effects in a printed circuit board assembly using embedded nickel-metal composite materials |
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US3476842A (en) * | 1966-08-10 | 1969-11-04 | Dow Corning | Composition for sealing joints and method of making same |
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-
1970
- 1970-07-13 US US00054405A patent/US3737997A/en not_active Expired - Lifetime
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US2808492A (en) * | 1954-07-26 | 1957-10-01 | Gen Electric | Electric heating units and methods of making the same |
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US3332138A (en) * | 1965-08-11 | 1967-07-25 | Gen Cable Corp | Method and apparatus for making precision sized tubing |
US3309458A (en) * | 1966-03-01 | 1967-03-14 | Fujikura Ltd | Coaxial cable with foamed resin dielectric bound by a thin film of solid resin dielectric |
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US3491778A (en) * | 1967-01-17 | 1970-01-27 | Kabel Metallwerke Ghh | Method and apparatus for cleaning and degreasing metal articles |
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Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
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