Powdered Insulation Patents (Class 174/102P)
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Patent number: 6017627Abstract: Disclosed is a high voltage electric appliance comprising electric coils whose conductors are wrapped by an insulating tape with subsequent impregnation of thermosetting resin for the electrical insulation. The insulating tape is a laminated body consisting of a built-up mica of fine mica particles and synthetic pulp or a paraffin powder and a reinforcing member. The bonding among the fine mica particles and between the fine mica particles and the reinforcing material is effected by the synthetic pulp as melted and solidified.Type: GrantFiled: October 6, 1997Date of Patent: January 25, 2000Assignees: Kabushiki Kaisha Toshiba, Nippon Rika Kogyosho Co., Ltd.Inventors: Noriyuki Iwata, Kenji Sakayanagi
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Patent number: 5904903Abstract: An electrically heatable starter catalytic converter (5) has a metallic housing (6) in which is arranged the actual catalyst (7) exposed to the exhaust gas flow, an electric resistance heating (8) and an electric connection line (10) that enters the housing (6) through an opening (9). The invention is characterized in that the electric connection line (10) is a metal-clad cable with at least one inner lead (11) electrically insulated from the metal cladding by a mineral (13). The inner lead (11) frictionally engages the electric resistance heating (8), and the metal cladding (12) enters the metallic housing (6) through the opening (9) and is welded or soldered to the edge of the opening (9) in a gas-tight manner.Type: GrantFiled: April 4, 1997Date of Patent: May 18, 1999Assignee: Heraeus Electro-Nite International N.V.Inventors: Uwe Hotz, Hagen Fischer
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Patent number: 5719353Abstract: A reinforced coaxial cable for underground service is disclosed. The cable generally includes an elongate center conductor, a surrounding dielectric material such as a foamed polymer dielectric, an outer conductor, a first jacket, an intermediate protective layer, and a second jacket. A ripcord can be positioned longitudinally between the first jacket and the intermediate protective layer to facilitate removal of both the intermediate protective layer and the second jacket. A tracer, or other visible indicia, extends longitudinally along the outer surface of the second jacket to facilitate locating the underlying ripcord. The intermediate layer and the second jacket provide increased impact resistance, cut-through resistance, and compressive strength, as well as increased resistance to abrasion and other frictionally induced damage. In addition, the intermediate layer and second jacket can be readily removed to allow increased flexibility or connectorization of the cable.Type: GrantFiled: June 13, 1995Date of Patent: February 17, 1998Assignee: Commscope, Inc.Inventors: Bruce J. Carlson, David H. Pixley, James L. Sorosiak
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Patent number: 5536478Abstract: A lead construction for a fluid heater such as an electrically heated catalytic converter, is set forth including a mineral insulated cable having a central core connected to the heater element of the fluid heater, an outer metal sheath connected to an enclosing housing for the fluid heater, and electrical insulation between the central core and the outer sheath.Type: GrantFiled: December 1, 1994Date of Patent: July 16, 1996Assignee: Corning IncorporatedInventors: G. Daniel Lipp, Alfred N. Mack, Paul S. Schmitt
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Patent number: 5262593Abstract: In a coaxial electrical high-frequency cable, a spacer is provided between the internal conductor and the external conductor in order to maintain the operation of the cable even in the case of elevated ambient temperatures. The spacer can be a helical profile or of individual shaped pieces made of glass or ceramic materials.Type: GrantFiled: March 3, 1992Date of Patent: November 16, 1993Assignee: Alcatel N.V.Inventors: Peter Madry, Helmut Hildebrand
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Patent number: 5111002Abstract: An improvement in the method for preparing diffusion resistant clad thermocouple cable by placing the thermocouple wires in MgO powder or pellets on a strip of metal cladding material and longitudinally bending the strip of cladding material around the thermocouple wire and the MgO and welding the resulting seam closed is achieved when the resulting composite cable is placed on a second metal cladding strip such that when the second strip is bent longitudinally around the composite cable the resulting seam is displaced from the welded seam of the first cladding strip.Type: GrantFiled: January 28, 1991Date of Patent: May 5, 1992Assignee: Omega Engineering, Inc.Inventor: Milton B. Hollander
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Patent number: 5086196Abstract: An electro-mechanical cable for use in cable deployed pumping systems includes a containment layer surrounding a cable core and constructed to restrain outward radial expansion of the core while permitting longitudinal expansion.Type: GrantFiled: August 9, 1990Date of Patent: February 4, 1992Assignee: Camco, IncorporatedInventors: Earl B. Brookbank, Walter Dinkins
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Patent number: 4998341Abstract: A method for making mineral insulated metal sheathed (MIMS) cable is disclosed. A tube of relatively large diameter is filled with at least one electrically conducting rod and an insulator. The resultant tubular assembly is sealed, hot rolled, reduced on a pilger (tube reducer) mill and drawn into relatively thin wire cable. The method is especially suitable for thermocouple cable production. Other applications include heating cable and control cable manufacture.Type: GrantFiled: April 2, 1990Date of Patent: March 12, 1991Assignee: Inco Alloys LimitedInventor: Trevor D. Jones
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Patent number: 4782316Abstract: Electromagnetic parts have windings composed of an inorganic insulating cable including a metal sheath, an inorganic insulating material, and conductive wires. Thereby, the windings are adapted to have higher heat resisting properties by selectively employing a material having a higher melting point and not changing its state even at temperature of about several hundred degrees Celsius as the sheath and the conductive wire.Type: GrantFiled: November 14, 1986Date of Patent: November 1, 1988Assignee: Sukegawa Electric Co., Ltd.Inventors: Yokichi Domeki, Masanori Nozaki, Hajime Ishimaru, Masao Tezuka
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Patent number: 4773976Abstract: A telecommunications conductor is produced by coating it with a visco-elastic dielectric material and then providing an electrically conductive material around the conductor by bombarding the visco-elastic material with particles of the conductor material and changing the visco-elastic material into hardened form. A shielding layer is provided by causing the particles to adhere to the surface of the dielectric material and when the particles provide a conductive path, the layer is completed by applying conductive material by electrolytical deposition or by plasma coating. Alternatively in an insulated conductor provided with a continuous inductive loading, the particles are caused to enter into and become discretely embedded within the visco-elastic material.Type: GrantFiled: April 14, 1986Date of Patent: September 27, 1988Assignee: Northern Telecom LimitedInventor: Gavriel L. Vexler
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Patent number: 4761336Abstract: Thermosetting powder coatings are provided which comprise a high epoxide equivalent weight epoxy resin or mixture of epoxy resins, a cure catalyst for the epoxy resin, an acrylic resin and a polyamide resin. These powder coatings are useful for forming corrosion resistant, essentially crack-free coatings on metal cable, especially cable which is subjected to post-tensioning.Type: GrantFiled: February 17, 1987Date of Patent: August 2, 1988Assignee: Morton Thiokol, Inc.Inventor: Stephen C. Hart
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Patent number: 4708897Abstract: The invention concerns a composite product, also referred to as cored wire, comprising a tubular metal casing having a welt-type seam, containing a core of compacted powder or granular material, which can be easily rolled up and then unrolled, without the risk of the seam coming undone. The composite product according to the invention comprises, on the outside wall of the casing and straddling the seam region, hollow impressed portions which are produced by cold deformation of the metal. These portions are in the form of grooves which are elongate transversely with respect to the axis of the composite product. The composite product according to the invention is used, in particular, for treating metal baths.Type: GrantFiled: February 27, 1984Date of Patent: November 24, 1987Assignee: VallourecInventor: Michel Douchy
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Patent number: 4689443Abstract: An armored cable having mineral insulation, comprising a metal central conductor and a cylindrical hollow metal sheath between which a powdered refractory insulating material is interposed, characterized in that the mineral insulating material is a mixture of 10 to 30% by weight of magnesium oxide (MgO) and 70 and 90% by weight of silicon oxide (SiO.sub.2).Type: GrantFiled: December 17, 1985Date of Patent: August 25, 1987Assignee: U.S. Philips CorporationInventor: Gilles Bailleul
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Patent number: 4679317Abstract: A cable which is insulated by means of mineral insulation material and which comprises one or more hollow electric conductors, a mineral insulation material provided around the conductor(s) and a metal sheath, the ends of said cable being sealed in a moisture-tight manner and having a passage for the central conductor(s), as well as a method of manufacturing the cable.Type: GrantFiled: March 28, 1986Date of Patent: July 14, 1987Assignee: U.S. Philips CorporationInventors: Gilles Bailleul, Tjerk Sannes
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Patent number: 4665281Abstract: A flexible tubing cable assembly having an outer sheath of flexible thin wall metal tubing with one or more conductors therein, each of the conductors having a first layer of a first dielectric and a second layer of a second dielectric, with a third dielectric material filling the space between the one or more conductors and the interior of the tubing. In one of several embodiments, the first dielectric is a polyimide film; the second dielectric is a layer of ethylene propylene compound; and the third dielectric is a magnesium oxide insulation. In another embodiment, the first dielectric is a polyimide; the second dielectric is fiberglass; and the third dielectric is a synthetic rubber. The tubing, in cross-section, may be circular or ovate. In addition, the tubing may be of either high tensile strength or low tensile strength, depending upon the weight supported, for instance, if a submersible pump is supported, high tensile strength tubing is used.Type: GrantFiled: March 11, 1985Date of Patent: May 12, 1987Inventor: Anthony G. Kamis
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Patent number: 4587726Abstract: In the method of manufacturing a continuous powder-filled tubular welding electrode, a strip of metal is initially shaped into an open channel and subsequently into a tube by abutting the edges of the strip. The edges are then welded to one another. The powder falls from a hopper into the tube which is fed downwards at the weld spot. The falling powder falls past the weld spot. The speed of the falling powder at the weld spot is higher than the speed of the tube, e.g., the speed of the falling powder is twice the speed of the tube. The powder which is subjected to the welding heat for a very short period of time fills the welded tube below the weld stop in step with the speed of the tube. Subsequently, a suitable reduction of the cross-sectional area of the powder-filled tube takes place.Type: GrantFiled: August 27, 1984Date of Patent: May 13, 1986Inventor: Werner A. Holmgren
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Patent number: 4586020Abstract: This invention relates to a sheathed resistance heater which comprises a metal pipe (3), a heating wire (2) received in the metal pipe, and an electrically insulating powder (4) filled in the pipe and also to a method for fabricating same. The electrically insulating powder (4) contains 0.1-10 wt % of the specific type of an oxide by which the heater has a prolonged life because the oxide serves to suppress the metallic component of the heating wire (2) from evaporating, and its insulation resistance under self-heating conditions can be prevented from lowering. The heater has wide utility in both domestic and industrial fields.Type: GrantFiled: January 17, 1983Date of Patent: April 29, 1986Assignee: Matsushita Electric Industrial Company, LimitedInventors: Noboru Naruo, Hidekata Kawanishi
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Patent number: 4562302Abstract: An inside cable having a core of conductors with conductor insulation formed from polyvinylchloride and in which interstices between conductors contains a fire resistant powder to resist burning of the core. The core is surrounded by a fire resistant jacket and the cable is devoid of a tubular metal shield or sheath surrounding the core.Type: GrantFiled: December 21, 1982Date of Patent: December 31, 1985Assignee: Northern Telecom LimitedInventors: John A. Checkland, Leo V. Woytiuk
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Patent number: 4512827Abstract: In a mineral insulated electric cable the powdered insulating material is impregnated with a quantity of a hydrophobic material, for example a silicone, which has been introduced into the powder in liquid form. The added hydrophobic material serves as a barrier against the ingress of moisture, and liquid dimethylpolysiloxane has been found particularly effective, the pressure of even a small quantity of this preventing any significant degree of moisture penetration into the cable.Type: GrantFiled: August 20, 1982Date of Patent: April 23, 1985Assignee: Associated Electrical Industries LimitedInventor: Dennis Gill
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Patent number: 4506251Abstract: This invention relates to a sheathed resistance heater which comprises a heating wire (2) received in a metallic pipe 3 and electrically insulating powder (4) packed in the pipe. A metallic powder of the specific type is added to the electrically insulating powder (4), by which the heating wire (2) has a prolonged life by suppressing metal components in the wire from evaporating, the heater being widely applicable for domestic and industrial purposes.Type: GrantFiled: January 18, 1983Date of Patent: March 19, 1985Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Noboru Naruo, Hidekata Kawanishi
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Patent number: 4439255Abstract: A heat-resistant insulated electric wire and cable which comprises an electric conduction; the first coating layer thereon consists of a mixture of a binder and a finely ground and unmelted inorganic substance; and the second organic insulating coating layer formed on the first coating layer. Said heat-resistant insulated electric wire can advantageously be used for a coil of a magnet or a motor.Type: GrantFiled: March 9, 1982Date of Patent: March 27, 1984Assignee: Nippondenso Co., Ltd.Inventors: Takeshi Imai, Naohiro Kako
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Patent number: 4437914Abstract: A method of producing sheathed cables and/or transducers such as wire strain gauges, temperature probes and so on. Such cables comprise an outer tubular casing and one or more electrically conductive leads embedded in insulating material. Production begins on a flat strip which is bent by means of a female mold into a tubular shape with an approximately circular cross-section, whereby the free edges of this blank are bent back so as to form radially protruding flanges. The leads are inserted into this preformed tubular casing and the spaces are filled with insulating material in powder form. The diameter of the tube is reduced and the density of the inserted insulating material is increased by pulling on the flanges in a specially designed abutment. After the desired density is attained, the flange is cut off and the free edges are welded together.Type: GrantFiled: March 8, 1982Date of Patent: March 20, 1984Inventor: Franz Frischen
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Patent number: 4435693Abstract: Sheathed electrical heating elements containing MgO heat conductive, electrical insulating material having a high degree of calcination together with additives in the form of a clay and fumed silica to increase the electrical resistivity, density and flow properties.Type: GrantFiled: June 7, 1982Date of Patent: March 6, 1984Assignee: Combustion Engineering, Inc.Inventor: Walter R. Johnson
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Patent number: 4419157Abstract: A process and apparatus for filling multi-conductor cables, particularly a telecommunication cable with several insulated wires surrounded by a covering and a sheath, with a mixture of powders which expand with the absorption of moisture. The conductors are fed in spaced relation into the entrance of a casing having an interior, frusto-conical wall which decreases in diameter from its entrance to its exit. The exit is small in diameter compared to the entrance so that the conductors converge as they pass from the entrance to the exit. Intermediate the entrance and the exit, the conductors are subjected to the powders which are caused to follow a helicoidal course by a screw which directs them toward the exit. Due to the shape of the casing wall, the powders are forced toward the conductors.Type: GrantFiled: September 8, 1981Date of Patent: December 6, 1983Assignee: Industrie Pirelli Societa per AzioniInventor: Antonio Ferrentino
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Patent number: 4415674Abstract: Sheathed electrical heating elements containing MgO heat conductive, electrical insulating material having an additive of fine particles of spherically shaped fused ZrO.sub.2 to increase the electrical resistivity and maintain favorable tap density and flow properties. The spherically shaped ZrO.sub.2 particles are formed by gravitationally separating the ZrO.sub.2 particles from ground fused zircon (ZrO.sub.2.SiO.sub.2).Type: GrantFiled: April 12, 1982Date of Patent: November 15, 1983Assignee: Combustion Engineering, Inc.Inventor: Walter R. Johnson
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Patent number: 4345111Abstract: Electrical conducting cable which is insensitive to nuclear radiation comprising at least one conductive core, at least one layer of an insulating substance surrounding said conductive core and at least one conductive sheath surrounding said insulating layer, wherein the diameter .phi..sub.D of the sheath, the diameter .phi..sub.B of the conductive core, the diameter of .phi..sub.C of the insulating layer are linked by the equation: ##EQU1## F.sub.1 representing the .beta..sup.- radiation fraction from the core reaching the sheath, F.sub.2 representing the .beta..sup.- radiation fraction from the sheath which reaches the core, the insulating substance being constituted by a mixture of at least two metal oxides.Type: GrantFiled: July 11, 1980Date of Patent: August 17, 1982Assignee: Commissariat a l'Energie AtomiqueInventor: Hubert Petitcolas
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Patent number: 4280932Abstract: Compacted, granular, fused magnesia used as thermally-conducting electrical insulation in tubular, electrical resistance elements is substantially improved in thermal conductivity through the addition of 0.1 to 10.0 percent of a glass comprising CaO, B.sub.2 O.sub.3 and optionally Al.sub.2 O.sub.3.Type: GrantFiled: May 22, 1980Date of Patent: July 28, 1981Assignee: General Electric CompanyInventors: Marcus P. Borom, John Schultz, Jr.
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Patent number: 4273597Abstract: The conductors of a cable core unit are powder filled by passing the core unit through a fluidized bed of powder with the conductors substantially closed together. The filled cable core unit can be wrapped with tape after exit from the fluidized bed. Cable cores may be filled also by passing them through a fluidized bed. The core units of the cores may be closed together or separated, but the conductors of each unit are closed together.Type: GrantFiled: September 11, 1979Date of Patent: June 16, 1981Assignee: Northern Telecom LimitedInventors: John N. Garner, Arthur S. Hayes
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Patent number: 4269397Abstract: A method for measuring the thickness of a refractory laid-up against the interior surface of the steel shell of a metallurgical apparatus includes placing at least one monitoring device in a critical wear area of the apparatus in a manner such that the free end of the device is at a known distance from the hot face of the refractory and the confined end extends beyond the outer surface of the steel shell. The device is connected to an electronic time-domain reflectometer by electrical connecting means. Timed pulses are generated and impressed in the device by the instrument and reflections of the pulses are received by and are visually displayed on the reflectometer. The length of the device appears on the display as a straight line bounded by two inflections. The straight line is indicative of the thickness of the refractory.The device includes a metallic conductor coaxial with an outer metallic sheath and separated therefrom by a refractory having a desired dielectric constant.Type: GrantFiled: July 7, 1980Date of Patent: May 26, 1981Assignee: Bethlehem Steel CorporationInventors: Robert A. Strimple, Joseph E. Snyder, Bruce F. Shoemaker
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Patent number: 4269639Abstract: In the manufacture of mineral insulated cable, by a continuous process in which the tubular sheath is formed by bending and seam welding travelling metal strip, and insulating powder and conductor wires are continuously delivered into the sheath, one wire is fed through a guide tube extending into the sheath beyond the weld point, and having an aperture in its wall adjacent to the weld area. The wire so exposed directly to the heat from the weld conducts excess heat away from the weld, thus preventing thermal damage, in particular to a powder delivery tube if present. The guide tube is so arranged that powder is excluded from the weld area. When the sheath is formed of an oxidizable metal such as copper, a continuous stream of rare gas is delivered to the underside of the weld area. Forms of apparatus for carrying out vertical and horizontal processes are described.Type: GrantFiled: January 30, 1980Date of Patent: May 26, 1981Inventor: Robert J. Lewis
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Patent number: 4265686Abstract: Cable core units comprising conductors grouped together by twisting are fed through a fluidized bed to fill voids with fluidized powder by flow of the powder between the grouped conductors. While still in the bed, the units are then deflected around rollers to cause relative displacement of the conductors which causes more complete filling of the voids with powder and powder redistribution to create uniformity of powder fill. Cable cores may also be filled with the core units closed together or separated in the bed but with units closed together when a core is deflected around the rollers.Type: GrantFiled: September 13, 1979Date of Patent: May 5, 1981Assignee: Northern Telecom LimitedInventor: John N. Garner
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Patent number: 4252583Abstract: For powder filling of cables, in a fluidized powder bed, it has been proposed to pass the cable core through the bed in a substantially closed condition. There is a limit to the number of conductors a core can have for effective filling. In the present invention the cable core is opened up into a number of core units by passing through an opening member. The opening member is freely ridable on the cable core and has a hole for each unit. The opener is held against a support member and an air bearing formed between the two members. Air is also usually fed to the holes in the opener member through which the core units pass to prevent flow of powder out from the bed. The opening member can be positioned in the fluidized bed or outside immediately prior to passage of the cable core through the bed. The units are each in a substantially closed condition in the bed and the units close to a single core also in the bed.Type: GrantFiled: December 4, 1979Date of Patent: February 24, 1981Assignee: Northern Telecom LimitedInventor: John N. Garner
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Patent number: 4215620Abstract: An igniter assembly for use in liquid propellant guns comprises an outer tubular conductor and an inner conductor spaced apart by a volume of tightly packed, irregular granules of an insulating material, such as a mineral powder. The outer conductor is supported in a longitudinal bore of a gun bolt.Type: GrantFiled: November 9, 1977Date of Patent: August 5, 1980Assignee: General Electric CompanyInventors: Douglas P. Tassie, Robert A. Pustell
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Patent number: 4164245Abstract: A device for filling the interstices of multi-stranded cable with powder, comprising an outer cylindrical housing and a concentric inner tube with a closed annular chamber between them. A hopper opens into the chamber and the chamber opens into the tube. A feeder in the chamber pushes the powder from the opening of the hopper to the opening into the tube.Type: GrantFiled: February 13, 1978Date of Patent: August 14, 1979Assignee: Northern Telecom LimitedInventors: Jorg-Hein Walling, Jean Bouffard
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Patent number: 4129774Abstract: A heating element consisting of a metal pipe, an electric resistance conductor inserted into the metal pipe and a heat resistant insulating material filled between said metal pipe and said electric resistance conductor, characterized in that said heat resistant insulating material is one obtained by coating a first insulating material such as particulate fused magnesia with a second insulating material having a lower melting temperature than that of the first insulating material such as a silicone resin, which has been molten, can maintain an insulation resistance of at least 10.sup.3 M.OMEGA. in an atmosphere at 40.degree. C and a relative humidity of 90%.Type: GrantFiled: August 13, 1976Date of Patent: December 12, 1978Assignee: Hitachi Heating Appliances Co., Ltd.Inventors: Tozaburo Inano, Katsuhiro Yamazaki, Minoru Otake
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Patent number: 4087777Abstract: A thermally conductive refractory electrical insulating embedding composition comprising granular magnesium oxide and granular fused magnesium iron alumino silicate; and electrical heating assembly having an electrically conductive heating member and a jacket and disposed between said member and said jacket a thermally conductive refractory electrically insulating embedding composition comprising granular magnesium oxide and granular fused magnesium iron alumino silicate.Type: GrantFiled: January 2, 1976Date of Patent: May 2, 1978Assignee: Dynamit Nobel AktiengesellschaftInventors: Helmut Clasen, Klaus Deneke
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Patent number: 4085653Abstract: An igniter assembly for use in liquid propellant guns comprises an outer tubular conductor and an inner conductor spaced apart by a volume of tightly packed, irregular granules of an insulating material, such as a mineral powder. The outer conductor is supported in a longitudinal bore of a gun bolt.Type: GrantFiled: September 15, 1976Date of Patent: April 25, 1978Assignee: General Electric CompanyInventors: Douglas Pray Tassie, Robert A. Pustell
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Patent number: 3971880Abstract: A cable for high frequency use in an environment with high and varying thermal changes whereby the thermal expansion of the cable is controlled by having a highly electrically conductive metal bonded to a metal of low coefficient of thermal expansion relative to the high electrically conductive metal. This is accomplished by providing a thin layer of highly electrically conductive metal over an inner core of a metal of low coefficient of thermal expansion. The cable can also utilize a similar bonded metal configuration for an outer concentric conductive sheath having a mineral dielectric between conductors that also has a low coefficient of thermal expansion.Type: GrantFiled: August 4, 1975Date of Patent: July 27, 1976Assignee: Kaman Sciences CorporationInventor: Dewey F. Harris