Heating Element Structure Patents (Class 219/552)
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Patent number: 5063029Abstract: A resistance adjusting type heater including a honeycomb structure having a large number of passages, at last two electrodes for energizing the honeycomb structure, and a resistance adjusting mechanism such as a slit provided between the electrodes to heat the gas flowing through the passages formed in the honeycomb structure. A catalytic converter includes a main monolith catalyst and the above-described heater placed adjacent to and upstream of the main monolith catalyst. A catalytic converter includes a honeycomb structure having a large number of passages, a catalyst carried on the honeycomb structure, at least two electrodes for energizing the honeycomb structure, and a resistance adjusting mechanism provided between the electrode. A catalytic converter includes a main monolith catalyst, and a heater placed adjacent to and upstream of the main monolith catalyst.Type: GrantFiled: June 29, 1990Date of Patent: November 5, 1991Assignee: NGk Insulators, Ltd.Inventors: Hiroshige Mizuno, Fumio Abe, Takashi Harada
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Patent number: 5034721Abstract: The invention relates to a method of manufacturing a heating element from a flat metal foil blank in which strips (1) are formed whose ends (2) are interconnected by connecting portions (3, 4) with alternate connecting portions disposed at opposite ends of the strips so as to form a meandering pattern and to a heating appliance incorporating such a heating element. In order to make such a foil heating element suitable for use in appliances in which an air stream to be heated passes over the foil heating element the connecting portions (3, 4) are bent in such a way that the strips (1) are tilted out of the plane of the foil blank. Preferably the strips are disposed an an angle .alpha. between 45.degree. and 90.degree. relative to the plane.Type: GrantFiled: August 24, 1989Date of Patent: July 23, 1991Assignee: U.S. Philips Corp.Inventor: Jan H. Benedictus
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Patent number: 5025131Abstract: Conductive polymer compositions based on polyvinylidene fluoride have improved properties when the polyvinylidene fluoride has a very regular structure which can be characterized by a low head-to-head content in the repeating units. The improved properties include electrical stability when contacted by organic fluids and/or when maintained at elevated temperatures in air. Such compositions which exhibit PTC behavior are particularly useful in the form of self-limiting heaters which are immersed in organic fluids, especially flexible strip heaters for heating diesel fuel before it passes through a fuel filter.Type: GrantFiled: January 5, 1990Date of Patent: June 18, 1991Assignee: Raychem CorporationInventors: Peter H. van Konyenburg, Andrew Au
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Patent number: 4987675Abstract: A coiled heating element is manufactured by providing a coiled element of bare resistance wire in which the coil pitch is not greater than twice the cross-sectional dimension of the wire. The element is stretched by an amount permitting recovery to its original configuration and an electrically insulating particulate material is applied to the stretched element. The stretched element is then allowed to return towards its original configuration thus trapping particulate material between adjacent coils of the element and the element is heated so as to oxidize the surface of the wire.Type: GrantFiled: July 25, 1988Date of Patent: January 29, 1991Assignee: Micropore International LimitedInventors: James D. J. Jackson, Derek E. Morgan
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Patent number: 4939341Abstract: A heating tool for heating at least one object, comprises an electrically heated U-shaped heater bar having a heat supplying contact surface for being pressed into contact with the object to be heated. A radiator is advantageously connected between arms of the U-shaped heater bar for receiving electrical current to produce radiated heat which heats another portion of the object or another object. Electricity may be provided by a single source to both the contact surface and the radiator.Type: GrantFiled: November 22, 1988Date of Patent: July 3, 1990Assignee: Productech Inc.Inventor: Gero Zimmer
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Patent number: 4939349Abstract: A building block-like PTC thermistor heating element is disclosed which comprises a ceramic semiconductor body having a positive temperature coefficient of resistance. The partition walls of the building block-like ceramic body provide the passages of the air flow. Ohmic electrodes are deposited on the opposite side of the major surface of the ceramic body so that when connected to an electrical source the electrical current flows across the partition walls in a direction normal to the axis of the air flow. The building block-like thermistor is very easy to fabricate and is very strong in structure so that high yield and improved mechanical strength can be achieved.Type: GrantFiled: June 23, 1989Date of Patent: July 3, 1990Assignee: Uppermost Electronic Industries Co., Ltd.Inventor: Chi Liu
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Patent number: 4931619Abstract: A glow plug for diesel engines in which a ceramic heater is supported, with the one end thereof cantilevered toward the outside, by the tip of a hollow holder; the ceramic heater is composed of a U-shaped heating portion and a pair of leads extending backwards from both ends of the U-shaped heating portion, both being formed integrally by an electrically conductive sintered sialon, which is formed by adding a small amount of Al.sub.2 O.sub.3 to a raw meal containing Si.sub.3 N.sub.4 as a principal ingredient, a small amount of AlN polytype and no greater than 5 wt. % of Y.sub.2 O.sub.3, and mixing the addition product with 23-70 vol.Type: GrantFiled: May 27, 1988Date of Patent: June 5, 1990Assignees: Hitachi Metals, Ltd., Jidosha Kiki Co., Ltd.Inventors: Yasunobu Ogata, Koichiro Kurihara, Mitusuke Masaka, Kouji Hatanaka
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Patent number: 4927993Abstract: A device is disclosed for preventing freezing of locking cylinders, which includes a heat conductive body member with an incandescent bulb removably mounted within an open-top internal recess. A temperature activated switch provides power to illuminate the bulb and thus heat the locking cylinder when the temperature reaches a predetermined limit, such as 0.degree. C. (32.degree. F.). A heat conductive spring thermally connected at its ends to the body extends around the locking cylinder to hold the body member against an underside of the locking cylinder whereby radiant and convective heat from the lamp may pass through the open top recess to heat the cylinder.Type: GrantFiled: November 30, 1988Date of Patent: May 22, 1990Inventor: Ray A. Simmons
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Patent number: 4923556Abstract: A laminating device for producing identification cards includes a press for glueing a number of foil sheets together; the press includes a lower press and an upper press. Each press is provided with a heating element, which is formed as a heating resistance element, and an insulation layer which is placed between the heating element and a metallic block which forms a portion of each press, to which a pressing force is applied. Each metallic block is cooled in cooperation with the insulation layer so that its temperature during the glueing and cooling process remains constant.Type: GrantFiled: July 14, 1988Date of Patent: May 8, 1990Assignee: D.I.S. Versand Service GmbHInventors: Johannes Kettelhoit, Hans W. Kunne, Erhard Schroder
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Patent number: 4916292Abstract: A coiled resistance heating element of carbonaceous or graphite material is disclosed. A simplified process which includes carbonization or graphitization of a coiled strand of an organic material is also disclosed.Type: GrantFiled: April 14, 1988Date of Patent: April 10, 1990Assignee: Mitsubishi Pencil Co., Ltd.Inventors: Takamasa Kawakubo, Mitsuru Yoshida, Yoshihisa Suda
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Patent number: 4869420Abstract: Refractory metals or ceramics are diffusion bonded or densified by assembling the workpieces to be bonded, wrapping the assembly with carbon yarn, heating the wrapped assembly, cooling the assembly and unwrapping. The expansion of the workpieces together with the shrinking of the carbon yarn produces tremendous pressures which cause bonding and densifying of the workpiece.Type: GrantFiled: December 20, 1988Date of Patent: September 26, 1989Assignee: Varian Associates, Inc.Inventor: Sebastian W. Kessler, Jr.
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Patent number: 4859836Abstract: Melt-shapeable polymeric compositions comprising a first fluoropolymer of relatively low crystallinity, e.g. a copolymer of tetrafluoroethylene and a perfluorinated comonomer, and a second fluoropolymer of relatively high crystallinity, especially a fluoropolymer obtained by irradiating PTFE or another fluoropolymer which cannot be melt-shaped in the absence of other polymers. The weight ratio of the first to the second polymer is preferably 0.3:1 to 2.5:1. The compositions have a wide variety of uses, for example as insulating materials or, if they contain carbon black or another conductive filler, as PTC conductive polymers.Type: GrantFiled: August 14, 1986Date of Patent: August 22, 1989Assignee: Raychem CorporationInventors: Hans E. Lunk, Donald A. Reed, Marguerite E. Deep, Charles Hill, Andrew Au
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Patent number: 4859835Abstract: A heating element comprises an electrically resistive track intended to be formed on an electrically insulative substrate. A heating unit comprises a heating element and a temperature sensor on a substrate, the sensor comprising an electrically resistive track. The track consists of a thick film having in the temperature range of from 0.degree. C. to 550.degree. C. a temperature coefficient of resistance in excess of 0.006 per degree C. The thick film includes a metal and a glass in such proportions as to provide a suitable resistivity and a thermal expansion coefficient to match that of an electrically insulative substrate to which the track is to be applied and to permit adhesion of the track to the substrate.The considerable variation of the resistance of the track with temperature provides advantages in both of the aforementioned applications.Type: GrantFiled: February 24, 1988Date of Patent: August 22, 1989Assignee: Thorn EMI plcInventor: Simon Balderson
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Patent number: 4855570Abstract: An electric heating unit for heating fluid, such as air in a hair drier, includes two ring-shaped electrodes and a plurality of spaced, plate-like ceramic heating elements having a positive temperature coefficient of resistance (PTC) aligned between the electrodes. The electrodes comprise an inner ring and an outer ring disposed in a nested, concentric, spaced relationship. The PTC ceramic plates are radially arranged in aligned spaced relationship with the opposite ends of each PTC ceramic plate mechanically and electrically connected respectively to the inner and outer rings. The inner and outer rings can be formed as arc-shaped segments separated by gaps prevent damage to the PTC ceramic plates by heat strain, and are provided with slits, grooves, etc., for firmly positioning the PTC ceramic plates.Type: GrantFiled: December 9, 1987Date of Patent: August 8, 1989Inventor: Tim Wang
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Patent number: 4814587Abstract: An improved performance ferromagnetic self-regulating heater. Constant alternating current is applied to a layered structure including at least one ferromagnetic layer. One or more layers of non-magnetic material is added to the ferromagnetic layer in such a way that the power factor of the heater is very significantly increased above its value in the absence of at least one of the layers. The alternating current flows through the different layers in varying quantities depending on layer composition, temperature and Curie point of the ferromagnetic layer. The structure generates heat by resistive heating as a function of the power applied. In one embodiment a single layer of non-magnetic, high-resistance material is in intimate electrical and thermal contact with one surface of the ferromagnetic material.Type: GrantFiled: June 10, 1986Date of Patent: March 21, 1989Assignee: Metcal, Inc.Inventor: Philip S. Carter
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Patent number: 4804823Abstract: A ceramic heater having a ceramic substrate, a heat-generating resistor disposed in the interior of the ceramic substrate or on the surface of the ceramic substrate and terminals connected to both the ends of the heat-generating resistor, wherein the ceramic substrate is composed of a sintered body of a nitride of an element selected from the group consisting of silicon and aluminum and the heat-generating resistor is composed of a ceramic layer containing titanium nitride (TiN) or tungsten carbide (WC).Type: GrantFiled: July 29, 1987Date of Patent: February 14, 1989Assignee: Kyocera CorporationInventors: Norio Okuda, Noriyoshi Nakanishi, Masahiro Yamamoto, Shinsuke Takenishi, Kenichiro Miyahara, Hiroaki Sonoda, Masanobu Ishida
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Patent number: 4790901Abstract: A laminating device for producing identification cards includes a press for glueing a number of foil sheets together; the press includes a lower press and an upper press. Each press is provided with a heating element, which is formed as a heating resistance element, and an insulation layer which is placed between the heating element and a metallic block which forms a portion of each press, to which a pressing force is applied. Each metallic block is cooled in cooperation with the insulation layer so that its temperature during the glueing and cooling process remains constant.Type: GrantFiled: February 3, 1988Date of Patent: December 13, 1988Assignee: D.I.S. Versand Service GmbHInventors: Johannes Kettelhoit, Hans W. Kunne, Erhard Schroder
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Patent number: 4786781Abstract: A ceramic glow plug comprises a ceramic heater formed by embedding a metal wire in a sintered Si.sub.3 N.sub.4 -based ceramic. The ceramic heater is brazed to the inner surface of an axial bore of a metal tube and the metal tube is brazed to the inner surface of an axial bore of a metal holder. The tip of the ceramic heater extends from the metal tube and metal holder and is coated with highly heat and corrosion resistant material to minimize erosion and corrosion due to combustion gases. The coating consists essentially of a thin CVD film of alumina (Al.sub.2 O.sub.3) having a thickness of 2 .mu.m deposited on a precoating AlON layer having a thickness of 0.5 .mu.m formed on the exposed surface of the tip. Alternatively, the protective coating may consist of thin CVD film of silicon carbide (SiC) or silicon nitride (Si.sub.3 N.sub.4) formed directly on the exposed surface of the tip.Type: GrantFiled: January 14, 1988Date of Patent: November 22, 1988Assignee: NGK Spark Plug Co., Ltd.Inventors: Shunkichi Nozaki, Yukihiro Kimura
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Patent number: 4785150Abstract: A heater comprising a sheet substrate formed of alumina and an electron-conductive pattern provided thereon and designed to generate heat, in which at least a portion of the electron-conductive pattern is provided thereon with an oxygen ion-conductive layer.Type: GrantFiled: December 6, 1985Date of Patent: November 15, 1988Assignee: NGK Spark Plug So., Ltd.Inventors: Takao Kojima, Nobuhiro Hayakawa, Yutaka Nakayama, Tetsusyo Yamada
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Patent number: 4774396Abstract: An apparatus for generating infrared radiation is provided including an electrical heating element that is able to withstand very high, continuous-use temperatures, surrounding or surrounded by a non-conductive material containing dopants of refractory metal oxides, rare earth oxides, or combinations of both. The material may be shaped about the heating element so that the infrared radiation emissions may be focused and/or directed in a desired manner.Type: GrantFiled: April 13, 1987Date of Patent: September 27, 1988Assignee: FabAid IncorporatedInventors: Herbert W. Salit, Ralph S. Keen, Jr., Robert M. Koeller
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Patent number: 4771166Abstract: A vacuum furnace has a heating chamber heated by metal strip electric heater elements. The elements have insulated mechanical support between their ends to hold them in position in the furnace. Support is provided by assemblies having spaced apart mounting assemblies with a rigid bridge compliantly mounted therebetween. The heater strip is compliantly connected to the bridge. Each mounting assembly has a metal post connected to the furnace heating chamber and surrounded by a ceramic sleeve. The ceramic sleeve is surrounded by two ceramic tubes which hold an end of the bridge therebetween.Type: GrantFiled: August 5, 1987Date of Patent: September 13, 1988Assignee: Grier-McGuire, Inc.Inventors: Dane T. McGuire, John K. Grier, Harold M. Bone, Suresh C. Jhawar, Michael T. Mercer
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Patent number: 4767916Abstract: A heating element for producing very high temperature by the Joule effect comprising by a cylindrical .beta.-alumina bar, in which is provided at least one recess containing at least one sodium salt.Type: GrantFiled: July 1, 1987Date of Patent: August 30, 1988Assignee: Commissariat a l'Energie, AtomiqueInventors: Robert Curtila, Daniel Tollens
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Patent number: 4754124Abstract: A resistance heater for performing heat treatment of the braze-affected area of a metallic sleeve attached by brazing within and to a metallic tube, comprises a metal tube (10) of which a portion (16) is formed with a spiral groove (11) which penetrates the wall thickness of the tube (10) and thereby defines a heating coil. The radial thickness of the convolutions of the coil varies lengthwise of the coil so that, when energized with electrical current, the coil develops a temperature profile which is determined by the variation in radial thickness. The temperature profile may be selected according to the needs of the brazed joint to be heat treated.Type: GrantFiled: March 2, 1987Date of Patent: June 28, 1988Assignee: United Kingdom Atomic Energy AuthorityInventors: Robert G. Howell, Malcolm Stevens
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Patent number: 4752672Abstract: An electrical heating device comprises a substrate, a pair of parallel, spaced apart elongated conductors extending longitudinally of the substrate, and a semi-conductor pattern carried on the substrate and electrically connected to and extending between the conductors. The semi-conductor pattern produces a thermal image for an infrared target. In some embodiments, the thermal image is irregular or circular in shape and the semi-conductor pattern includes a plurality of transversely-spaced bars having relatively wide portions outside, and relatively thin portions within, the area producing the thermal image.Type: GrantFiled: December 23, 1986Date of Patent: June 21, 1988Assignee: Flexwatt CorporationInventor: Frederick G. J. Grise
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Patent number: 4749844Abstract: A sheet heater including a substrate, a semi-conductor pattern (typically of colloidal graphite) having a pair of spaced-apart conductor contact portions and a heating portion extending between and electrically connected to the contact portions, and a pair of conductors one of which overlies and engages each of the contact portions. Each of the conductors is wider than the respective underlying contact portions of the semi-conductor pattern, and includes a pair of longitudinally-extending strip portions with a central portion including a plurality of longitudinally-shaped openings therebetween. The strip portion at one edge of the conductor overlies and engages a respective contact portion; and a sealing layer of insulating material overlies the respective conductor and is sealed to the substrate along the edges of the conductor and through the longitudinally-spaced openings.Type: GrantFiled: April 30, 1986Date of Patent: June 7, 1988Inventor: Frederick G. J. Grise
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Patent number: 4733055Abstract: An electric heating element with a resistance element, a metal sheath in heat transfer relation to the resistance element on one side of the sheath and a thin, dry coating of refractory material major proportion by weight of which is boron nitride on another side of the sheath to be placed in heat transfer relation to an object to be heated. A method of enhancing the heat-transfer qualities of a metal sheathed electric heating element includes coating the metal sheath, on a surface to be placed in heat-transfer relation to an object to be heated, with a liquid slurry of refractory material a major proportion of which is boron nitride, drying and outgassing the coating and mounting the sheathed element on an object to be heated with the coating in contact with the object.Type: GrantFiled: August 25, 1986Date of Patent: March 22, 1988Assignee: Emerson Electric Co.Inventor: Donald M. Cunningham
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Patent number: 4728780Abstract: This invention concerns a heating pipe for panel heaters disclosed on walls, ceilings or floors to heat a room. The pipe is essentially constructed of a pipe itself, an electric heating wire running through it and aluminum granules stuffed between the two. Because of the simple structure, the production, the installment and the maintenance costs are cheap; as a matter of course, there is no additional need of a circulation pump for heating media and safety devices to watch the leak of heating media or the break of the pipe. Moreover, because spherical aluminum granules are closely packed, the heat conductivity is very good, which minimizes the heat loss and reduces the time to heat up a room. Also, the heat capacity is so small that frequency room temperature control by means of an automatic on-and-off mechanism has becomes possible.Type: GrantFiled: July 14, 1986Date of Patent: March 1, 1988Inventor: Eiji Uchino
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Patent number: 4723973Abstract: An exhaust-gas purifying apparatus according to the present invention comprises an exhaust-gas filter for trapping particulates in exhaust gas from an engine, and a heating device located on the upper-course side of the filter, with respect to the flowing direction of the exhaust gas, the heating device including one or more conductive-ceramic heater elements, capable of heating and burning the particulates caught by the filter, and a heater case for holding the heater elements in position, so that the caught particulates are heated and burned by the heater elements when the flow resistance of the exhaust gas, flowing through the filter, is increased by the caught particulates, whereby the flow resistance is reduced. The heater element includes a fixed electrode portion, immovably fixed to the heater case, and a slidable electrode portion held slidably.Type: GrantFiled: September 26, 1986Date of Patent: February 9, 1988Assignees: Nippondenso Co., Ltd., Toyota Jidosha Kabushiki KaishaInventors: Kazuo Oyobe, Hiroki Hoshizaki, Terutaka Kageyama, Hirofumi Suzuki, Yoshihiko Imamura, Kiyoshi Kobashi, Kenichiro Takama, Shinichi Takeshima
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Patent number: 4724356Abstract: A matrix of infrared generating cells is disclosed. Each cell includes a resistive element formed over and traversing a cavity formed on the surface of the supporting semiconductor substrate.Type: GrantFiled: October 10, 1986Date of Patent: February 9, 1988Assignee: Lockheed Missiles & Space Co., Inc.Inventor: Max Daehler
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Patent number: 4723069Abstract: A ceramic heater for regenerating a fine particle collecting filter which is exposed to exhaust gases at elevated temperatures. This ceramic heater comprises two electrode potions, a heat generation portion connected to the two electrode portions and a holding projection portion of a ceramic heater connected to the side of the heat generating portion. The two electrode portions, the heat generating portion and the holding projection portion are formed integrally.Type: GrantFiled: September 16, 1986Date of Patent: February 2, 1988Assignees: Toyota Jidosha Kabushiki Kaisha, Nippondenso Co., Ltd.Inventors: Hiroki Hoshizaki, Kazuo Oyobe, Hirofumi Suzuki, Nobuaki Kawahara, Terutaka Kageyama, Hitoshi Niwa, Shinichi Takeshima, Yoshihiko Imamura, Kiyoshi Kobashi, Kenichiro Takama
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Patent number: 4719331Abstract: A ceramic glow plug in which a large resistance suitable for adapting the plug for use with a 24 V battery without having to use a thin or long heating wire. The glow plug includes a ceramic heater having a sintered ceramic body and a heating wire made of an alloy of a high melting point metal such as tungsten embedded in the ceramic body. The ceramic heater is secured to one end of a metal sheath with an outer end portion of the ceramic heater protruding from the end of the metal sheath by as small a distance as possible. A mounting shell receives the other end of the metal sheath. The heating wire is preferably made of a tungsten alloy containing 5 to 39 wt % rhenium to provide the desired resistance.Type: GrantFiled: September 19, 1986Date of Patent: January 12, 1988Assignee: NGK Spark Plug Co., Ltd.Inventors: Masatoshi Ito, Katsuhiko Tanaka
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Patent number: 4717813Abstract: A resistor particularly useful as a multiphase, self-regulating fluid heater has passages extending through a body of ceramic resistance material of positive temperature coefficient of resistivity (PTC) for heating fluid adapted to pass therethrough. Several embodiments are provided with electrically conductive coatings formed on inner walls of the passages with the passage walls defining thin webs of the resistance material having uniform thickness from end to end. The passages are arranged in a plurality of sets with the conductive coating on the walls of the passages of each set interconnected and adapted for electrical connection with a respective electrical phase. The passages of the sets are alternated relative to one another throughout the body with a passage of one set immediately adjacent only to passages of other sets. The passages are configured in different embodiments including hexagonal, triangular and rectangular as seen in plan view showing one end of the body.Type: GrantFiled: April 16, 1986Date of Patent: January 5, 1988Assignee: Texas Instruments IncorporatedInventors: Peter G. Berg, Leo Marcoux, Bernard M. Kulwicki
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Patent number: 4711990Abstract: The ceramic heater of the present invention is used for regenerating a fine particle collecting filter which is exposed to exhaust gases at elevated temperatures. In this ceramic heater, which is capable of being cantilevered, two electrode portions are provided on a single straight or curved line and heat generating portion is positioned on one side of said line. The heat generating portion comprises a ring-like portion and two leg portions integrally connected to the ring-like portion at two connecting portions which approximately bisect the ring-like portion. The two electrode portions are provided at fore ends of the leg portions respectively, and the ring-like portion and the two electrode portions conjointly form a triangle.Type: GrantFiled: January 7, 1986Date of Patent: December 8, 1987Assignee: Nippondenso Co., Ltd.Inventors: Hiroki Hoshizaki, Nobuaki Kawahara, Hirofumi Suzuki, Kazuo Oyobe
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Patent number: 4694973Abstract: A device for warming and illuminating pre-packaged, pre-wetted disposable towels is provided. The unit also secures a plastic canister of disposable towels so that the towels may be dispensed with one hand. A cup sized to enclose the canister in an upper sector has a supporting dish, upon the upper surface of which is provided a series of lips to engage various diameter plastic canisters containing the towels. The dish has a recessed bowl at its center in which one or more small incandescent light bulbs are mounted to warm the fluid pool within the canister and to provide illumination through a translucent window portion of the cup. The top of the dispenser is capped to retain the container from above, while the dish is spring mounted within the cup to assure a snug vertical fit of the container within the cup. A dispenser opening is provided in the cap of the unit, through which the towels from the container are pulled out.Type: GrantFiled: December 2, 1985Date of Patent: September 22, 1987Assignee: Warmwipes, Inc.Inventors: K. Daniel Rose, Charles Yarbrough, Alan F. Strachan
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Patent number: 4682008Abstract: A self-temperature control type glow plug includes a rod heater held at a front end of a hollow metal holder and having one end extending outside the hollow metal holder. The rod heater includes a heating section made of a conductive ceramic material with a small positive temperature coefficient and a control section made of a conductive ceramic material with a positive temperature coefficient larger than that of the heating section. The heating section is formed integrally with the control section.Type: GrantFiled: March 6, 1986Date of Patent: July 21, 1987Assignee: Jidosha Kiki Co., Ltd.Inventor: Mitusuke Masaka
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Patent number: 4656340Abstract: A heater coil mounting is provided by means of a bracket having seats formed at or adjacent each axial end and into which an insulator through which the heater element passes, is adapted to be received. The bracket is mounted in position on a wall using tabs which cooperate with portions of the bracket to hold the bracket close to the wall and form a further portion of the seat to lock the insulator in position.Type: GrantFiled: April 30, 1985Date of Patent: April 7, 1987Assignee: Camco Inc.Inventor: Robert M. St. Louis
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Patent number: 4633068Abstract: An electrical heating device comprises a substrate, a pair of parallel, spaced apart elongated conductors extending longitudinally of the substrate, and a semi-conductor pattern carried on the substrate and electrically connected to and extending between the conductors. The semi-conductor pattern produces a thermal image for an infrared target. In some embodiments, the thermal image is irregular or circular in shape and the semi-conductor pattern includes a plurality of transversely-spaced bars having relatively wide portions outside, and relatively thin portions within, the area producing the thermal image.Type: GrantFiled: February 15, 1984Date of Patent: December 30, 1986Assignee: Flexwatt CorporationInventor: Frederick G. J. Grise
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Patent number: 4630024Abstract: A grid resistor assembly includes a plurality of flat grid resistor elements. Each element includes at least one open-ended loop having side portions and a tip end portion connected together through intervening strip portions of narrower width than the side portions to improve current carrying capacity and to provide for more even heating and heat dissipation. An assembly of such elements is particularly used as a resistor box in an electric, motor-driven, transit vehicle, such as a subway car, and is provided in a predetermined space envelope to perform predetermined electrical parameters.Type: GrantFiled: September 28, 1984Date of Patent: December 16, 1986Assignee: Post-Glover Resistors, Inc.Inventor: David W. Allen
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Patent number: 4620086Abstract: To reduce the tendency of ground faults and short circuits on electrical heating elements operating at elevated voltages and temperatures, resistance heating wire is coated with a sublayer of magnesium zirconate followed by an outer layer of aluminum oxide; each layer being in the range of 0.001 to 0.010 inches thick.Type: GrantFiled: September 30, 1985Date of Patent: October 28, 1986Assignee: General Electric CompanyInventors: Adrian R. Ades, Paul B. Pribis, Donald J. Proach
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Patent number: 4593182Abstract: A cartridge heater includes an inner casing in which a heating element is accommodated. This inner casing is surrounded by an coaxially arranged outer casing of larger diameter so that an annular space is defined between the inner and outer casings. In the space a helical coolant piping is arranged, embedded in a highly heat-conductive substance of granular and/or pulverulent form so as to allow excess heat to be carried away.Type: GrantFiled: November 16, 1984Date of Patent: June 3, 1986Assignee: Hotset Heizpatronen und Zubehor GmbHInventor: Eugen Schwarzkopf
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Patent number: 4591700Abstract: Novel PTC conductive polymer compositions contain a mixture of two crystalline polymers of different melting points, the higher melting of the polymers having a melting point which is at least 160.degree. C. and at least 25.degree. C. higher than the melting point of the other polymer. The compositions do not increase in resistivity by a factor more than 2 when maintained at 150.degree. C. for 1000 hours, and are therefore particularly suitable for self-limiting heaters which can be used on apparatus which is periodically subjected to high temperatures, e.g. during steam-cleaning thereof.Type: GrantFiled: March 12, 1984Date of Patent: May 27, 1986Assignee: Raychem CorporationInventor: Umesh K. Sopory
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Patent number: 4588976Abstract: These resistors are obtained from conductive sheet material, for example metal sheet material (usually referred to as "grids") in which additional plates are provided in order to distribute the current density and consequently to predetermine the temperature and strain distributions caused on the resistor during load conditions.Type: GrantFiled: November 19, 1984Date of Patent: May 13, 1986Assignee: Microelettrica Scientifica S.P.S.Inventor: Franco Jaselli
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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: 4584464Abstract: An electrically energizable high intensity, radiant energy heater (8) having a general M-shape for providing a pocket (20) for localized high intensity isothermal heating for fusion and fiber processing. The heater is shaped to provide easy access for a fiber (18) at an entry (16) to enable insertion of the fiber into the isothermal high temperature zone in pocket (20). A second re-entrant wall external to the pocket provides radiant shielding and buffers the isothermal heating zone from the cool environment. The heater may be constructed from a ribbon of a resistively heated metal, such as platinum foil.Type: GrantFiled: July 2, 1984Date of Patent: April 22, 1986Assignee: Hughes Aircraft Co.Inventor: Jon H. Myer
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Patent number: 4572938Abstract: Small portable electrical resistance heated radiant heating unit useful for insertion in tube bores to effect localized high temperature heating. Useful for the internal heating of tubes and tube/sleeve assemblies in steam generators, for brazing, stress relieving, and other applications. Has a machined mandrel of boron nitride and electrical resistance wire leads that have reduced electrical resistance for reduced heat generation by the leads. The leads preferably are braided, to permit the use of cramped connectors.Type: GrantFiled: January 16, 1984Date of Patent: February 25, 1986Assignee: Westinghouse Electric Corp.Inventors: John M. Driggers, Thomas J. Saska, Arnold S. Kitzes
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Patent number: 4565921Abstract: An electric thermal unit is disclosed for controllably heating cylinders in plastic material extruders, rubber drawing machines, and the like apparata. The electric thermal unit is designed to provide closed circuit ventilation air circulation such as to enable the heated outlet air to be used for other applications, whether related or not to the proper operation of the cited apparata.Type: GrantFiled: March 12, 1984Date of Patent: January 21, 1986Inventor: Gaetano Piazzola
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Patent number: 4562337Abstract: An electrical solder pot has a base with a hollow interior. A housing member also having a hollow interior attaches to the top of the base. The housing member further includes an opening at its top. A threaded socket is fitted in the base so as to accept a heating element which is oriented vertically within the hollow interior of the combined base and housing member. The heating element includes a threaded connector positioned near the opening in the top of the housing and accepts a threaded solder container. The solder container attaches to the top of the heating element and is positioned above the opening in the housing. The heating element includes an internal thermal conducting member located within a tube with an appropriate socket connector on the tube so as to connect to the socket in the base. A monolithic burnt ceramic heater is positioned within a cavity in the thermal conducting member.Type: GrantFiled: May 30, 1984Date of Patent: December 31, 1985Assignee: Eldon Industries, Inc.Inventor: William Lawrence
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Patent number: 4555434Abstract: Anti-glare glass pane for a vehicle where the pane has a main area of a field of vision and a secondary area of a field of vision located below the main area which is less transparent to the visible spectrum than said main area.Type: GrantFiled: September 30, 1983Date of Patent: November 26, 1985Assignee: Saint-Gobain VitrageInventor: Heinz Kunert
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Patent number: 4554441Abstract: A delivery system is provided for use in conjunction with the metalurgical furnace of the type having an elongated furnace chamber with an access door at one end for delivering a coffin containing parts into the interior of the furnace chamber. The delivery system comprises a plurality of rollers which are secured to the bottom of the furnace chamber so that axes of the rollers extend transversely with respect to the axis of the furnace chamber. In use, the rollers frictionally engage the bottom of the coffin and guide the coffin into the furnace chamber. Preferably, the coffin includes upwardly extending channels on its bottom, and which the rollers are positioned.Type: GrantFiled: February 19, 1985Date of Patent: November 19, 1985Assignee: Ultra-Temp CorporationInventor: Roy C. Lueth
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Patent number: 4553025Abstract: An insulated electric heating element particularly suitable for use in a hot plate or electric stove is disclosed. The insulated electric heating element (11) includes a unitary two chamber housing (21). The chambers are located one above the other. A U-shaped upper chamber (22) houses a resistive electric heating element (23). A U-shaped lower chamber (24) houses thermal insulation (30). The thermal insulation reduces the heat radiated downwardly and sidewardly and correspondingly increases the heat radiation upwardly by the electric heating element.Type: GrantFiled: October 3, 1984Date of Patent: November 12, 1985Inventor: Herman E. Raskov