Element Forms A Coating Patents (Class 338/300)
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Patent number: 6452477Abstract: A high voltage low inductance resistor (120) includes a resistor body (122) having a perimeter and a center. A first terminal (126) is located away from the center of the resistor near the perimeter of the body (122). A serpentine resistance element (130) includes a first end (136). A conductive ring (124) is located near the perimeter and circumscribes the serpentine resistance element (130). The ring (124) is electrically connected to the first terminal (126). The first end (136) is electrically connected to the conductive ring (124). A first resistance segment (138a) of the resistance element (130) begins at the first end (136) and extends in a first direction generally around the perimeter of the body (122). An apex (142a) has an input portion (143) and an output portion (145). The apex (142a) redirects the resistance element in a generally opposite direction, the input portion (143) transitioning into the first resistance segment (138a).Type: GrantFiled: September 6, 2000Date of Patent: September 17, 2002Assignee: Marconi Medical Systems, Inc.Inventors: Tony W. Roca, John R. Anderson
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Patent number: 6420955Abstract: The resistive current limiter contains an electrically insulating support body and at least one conductor track structure arranged thereon and having a conductor track made of high-Tc superconductor material. The conductor track has straight and curved conductor track segments. A maximum radii ratio v of 7 (v=ra/ri where ra=external radius, ri=internal radius) is to be maintained for the curved conductor track segments. The conductor track is advantageously patterned from a layer which is made of the high-Tc superconductor material and is applied on the support body.Type: GrantFiled: January 17, 2001Date of Patent: July 16, 2002Assignee: Siemens AktiengesellschaftInventors: Björn Heismann, Hans-Peter Krämer
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Patent number: 4727350Abstract: A surge absorber in which an electrically conductive thin film is vaporized on the surface of a ceramic circular cylinder, a micro.groove is trimmed using a laser beam to define a spiral locus on the surface, and a linear.groove is trimmed to intersect the micro.groove to divide the thin film into a plurality of segments, so that overvoltages applied across the two electrodes can be absorbed.Type: GrantFiled: February 20, 1987Date of Patent: February 23, 1988Inventor: Hitoshi Ohkubo
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Patent number: 4618839Abstract: A microwave attenuator forming two series connected L-pads is comprised of a plurality of electrically conductive, resistive, and non-conductive sections disposed on the surface of an elongate dielectric cylindrical base. The series resistances are connected through a conducting strip having an impedance that matches the impedance of the L-pads.Type: GrantFiled: April 11, 1985Date of Patent: October 21, 1986Inventor: Jon E. Barth
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Patent number: 4582980Abstract: A glow plug for preheating the combustion chamber of a diesel engine includes a tubular metal sheath (5) closed at an end to define a tip and in which an electric heating element spiral (7) is embedded within a powder (6) of an electrically insulating material. The spiral (7) is connected by one end to the sheath tip and and at its other end to a current feeder (4). The filament (8) of the spiral (7) is advantageously made of a Fe-Cr-Al alloy and is coated for an initial length (L.sub.1) of the spiral (7), from the connection location thereof with the current feeder (4), with a high electrical conductivity material (9), preferably nickel (Ni) having a very high positive temperature coefficient of resistance with respect to that of the filament (8). The uncoated end length (L.sub.2) of the spiral (7) acts as a heating element while the initial coated length (L.sub.1) acts as a control resistance element for the supply current upon increase in the sheath temperature.Type: GrantFiled: December 10, 1984Date of Patent: April 15, 1986Assignee: Fabbrica Italiana Magneti Marelli S.p.A.Inventor: Gilberto Izzi
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Patent number: 4160897Abstract: In a ceramic heating element comprising a ceramic substrate having on a surface thereof a resistor pattern of an electrically conductive material and a ceramic electrically insulating layer disposed on the surface of the ceramic substrate with the resistor pattern thereon, the improvement wherein the ceramic electrically insulating layer includes an opening, the resistor pattern exposed by the opening in the ceramic electrically insulating layer being electrically shorted and/or an electrical short-circuiting path previously provided in the resistor pattern being cut whereby the resistivity of the resistor pattern is adjusted to within a particular range, and a heat resistant electrically insulating coating filling the opening in the ceramic electrically insulating layer.Type: GrantFiled: June 13, 1978Date of Patent: July 10, 1979Assignee: NGK Spark Plug Co., Ltd.Inventor: Yoichi Makino
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Patent number: 4137516Abstract: A grinding wheel is provided around the inside of its hole with a plurality of turns of an electrical conductor weaker in tension than the material of the wheel, the ends of which are brought out to terminals on the surface of the wheel. Incipient cracks in the wheel rupture the conductor, which is checked as desired with a continuity testing device.Type: GrantFiled: October 31, 1977Date of Patent: January 30, 1979Assignee: Carnegie-Mellon UniversityInventors: Milton C. Shaw, Rangachary Komanduri, Soichi Kumekawa
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Patent number: 4042006Abstract: A band-shaped metal layer useful as a resistance layer and/or a contact layer is pyrolytically deposited onto a cylindrical substrate by surrounding the surface of the substrate with a mixture of a thermally decomposable metal compound and a carrier therefor and substantially simultaneously heating only precise surface areas of the substrate, as by a laser beam, to a temperature slightly above the thermal decomposition temperature of the metal compound and moving the substrate in a rotational and/or axial manner so that a band-shaped metal layer forms only at the heated surface areas of the substrate.Type: GrantFiled: October 22, 1975Date of Patent: August 16, 1977Assignee: Siemens AktiengesellschaftInventors: Alfred Engl, Guenther Heim
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Patent number: 3982218Abstract: A temperature sensing device and a method of forming it is disclosed. A first film or coating of an adherent electro-conductive metallic oxide is applied over the exterior surface of a dielectric substrate. The metal oxide coating is thereafter thoroughly cleansed and a second coating or layer of a metal having a relatively high temperature coefficient of resistance is applied over the metallic oxide film so as to form a strong physical bond as well as a chemical bond therebetween. The composite so formed is fired at a temperature up to about 750.degree.C. If desired, the metal layer is thereafter suitably spiralled to provide the desired resistance and terminal leads are attached to the element. Also, if desired, the element is then coated with a dielectric protective coating.Type: GrantFiled: September 19, 1974Date of Patent: September 21, 1976Assignee: Corning Glass WorksInventors: Meryle D. W. Adler, John T. Brown
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Patent number: RE30158Abstract: A layer of material is disposed over at least a portion of a resistive film of a resistor. The material having a melting point lower than the melting point of the resistive film and when melted, chemically reacts with the resistive film to render at least a portion of the film non-conductive.Type: GrantFiled: October 9, 1974Date of Patent: November 20, 1979Assignee: P. R. Mallory & Co. Inc.Inventors: James B. Bucklin, Jay Utken