Coated Or Thin Film Device (i.e., Active Or Passive) Patents (Class 505/701)
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Patent number: 5026683Abstract: A superconducting wire and a process for fabricating such a wire. The present invention relates specifically to the fabrication of a wire using a ceramic superconducting material. Initially, a quantity of highly pure high temperature superconducting material is obtained. The superconducting material may be fabricated by any one of a number of known fabrication methods such as by aqueous coprecipitation, conventional sol gel techniques or solid state reaction processes.Once a ceramic superconducting material in particulate form is obtained, surface impurities on the particles are removed. One such surface cleaning procedure is known as "sputtering." Sputtering strips the surface atoms from the surface of the superconducting material, leaving only pure superconducting ceramic.The superconductive ceramic produced according to the procedure outlined above is then used in the formation of a superconducting wire.Type: GrantFiled: October 27, 1988Date of Patent: June 25, 1991Assignee: General AtomicsInventor: Tihiro Ohkawa
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Patent number: 5024894Abstract: New Method of buffering silicon and similar semiconductor wafers with appropriate metal oxide layers which, in turn, have been found to be excellent substrates for MOS depositions without interaction with the semiconductor surface, and novel buffered wafers produced thereby.Type: GrantFiled: September 15, 1989Date of Patent: June 18, 1991Assignee: Academy of Applied ScienceInventor: James C. W. Chien
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Patent number: 5024993Abstract: A hybrid superconducting-semiconducting field effect transistor-like circuit element comprised of a superconducting field effect transistor and a closely associated cryogenic semiconductor inverter for providing signal gain is described. The hybrid circuit functions as a nearly ideal pass gate in cryogenic applications.Type: GrantFiled: May 2, 1990Date of Patent: June 18, 1991Assignee: Microelectronics & Computer Technology CorporationInventors: Harry Kroger, Uttam S. Ghoshal
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Patent number: 5022275Abstract: In a strain measuring device employing a magnetic permeability detector means to detect an amount of strain in a passive member as changes of magnetic permeability in a magnetostrictive layer, a magnetic shielding layer is formed on the surface of the passive member, and the magnetostrictive layer is formed thereon so as to lessen the adverse effects of the passive member caused by the magnetic characteristics of the passive member in strain measurement, that is, to reduce measurement errors. Alternatively, a magnetostrictive layer is formed on the surface of the passive member, or a magnetic shielding layer is partially forrmed on the surface of the passive member of soft magnetic material with high permeability, so as to lessen the influence of the passive member caused by thermal stresses of the passive member in strain measurement, that is, to reduce measurement errors. Further, there is provided a strain measuring device which facilitates formation of the magnetostrictive layer.Type: GrantFiled: April 12, 1989Date of Patent: June 11, 1991Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Hiroshi Satoh, Yoshihiko Utsui
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Patent number: 5019554Abstract: The structure of a wiring according to the present invention has a buffer layer interposed between an insulating layer and a wiring of a superconductive ceramic material, and the buffer layer hardly reacts on the superconductive ceramic material in a high temperature ambient, so that the superconductive ceramic material does not lose the superconductivity due to an influence of the buffer layer on the superconductive ceramic material during the formation stage of the wiring.Type: GrantFiled: August 18, 1989Date of Patent: May 28, 1991Assignee: Mitsubishi Metal Corp.Inventors: Takuo Takeshita, Tadashi Sugihara
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Patent number: 5019551Abstract: In a superconducting contact structure between an oxide superconductor and a metal superconductor, the oxide superconductor has a recess in a surface which is in contact with the metal superconductor.Type: GrantFiled: September 6, 1988Date of Patent: May 28, 1991Assignee: NEC CorporationInventor: Mutsuo Hidaka
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Patent number: 5017551Abstract: A circuit element is disclosed comprised of a substrate and an electrically conductive layer located on the substrate. The electrically conductive layer is comprised of a crystalline rare earth alkaline earth copper oxide. The substrate is formed of a material which increases the electrical resistance of the conductive layer when in contact with the rare earth alkaline earth copper oxide during crystallization of the latter to an electrically conductive form. A barrier layer is interposed between the electrically conductive layer and the substrate. The barrier layer contains magnesium, a group IVA metal, or a platinum group metal, either in an elemental state or in the form of an oxide or silicide.Type: GrantFiled: March 30, 1989Date of Patent: May 21, 1991Assignee: Eastman Kodak CompanyInventors: John A. Agostinelli, Jose M. Mir, Gustavo R. Paz-Pujalt, Mark Lelental, Ralph A. Nicholas, III
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Patent number: 5011820Abstract: A process for supplying a current consumer with current from an accumulator for electrical energy, in which electrical energy pulses of very short duration each are supplied to the current consumer from a superconducting accumulator (2) made with superconductors (8) of very small diameter or very small layer thickness. The superconductors (8) are preferably high-temperature superconductors.Type: GrantFiled: July 20, 1989Date of Patent: April 30, 1991Assignee: Heidelberg Motor GmbH Gesellschaft fur EnergiekonverterInventors: Peter Ehrhart, Andreas Grundel, Gotz Heidelberg, Wener Weck
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Patent number: 5006507Abstract: A ceramic superconductor comprises a substantially nonmagnetic preannealed nickel-based alloy substrate which supports a ceramic superconductor. The substrate may include aluminum to strengthen the substrate and make it less magnetic. The substrate is substantially devoid of minority constitutent oxide shell formers and the ceramic is formed on the substrate by sintering superconductor grains at temperatures above 1000.degree. C. to enhance densification of the ceramic.Type: GrantFiled: April 14, 1989Date of Patent: April 9, 1991Assignee: General AtomicsInventors: Lawrence D. Woolf, Frederick H. Elsner, William A. Raggio
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Patent number: 4997813Abstract: Improvement in a superconducting thin film of a superconducting compound oxide containing thallium (T1) deposited on a substrate, characterized in that the superconducting thin film is deposited on {110} plane of a single crystal of magnesium oxide (MgO).Type: GrantFiled: June 19, 1989Date of Patent: March 5, 1991Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenjiro Higaki, Keizo Harada, Naoji Fujimori, Hideo Itozaki, Shuji Yazu
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Patent number: 4997808Abstract: A combination is disclosed comprising a superconductive ceramic oxide which degrades in conductivity upon contact of ambient air with its surface and, interposed between said ceramic oxide surface and ambient air, a passivant polymer.Type: GrantFiled: December 27, 1988Date of Patent: March 5, 1991Assignee: Eastman Kodak CompanyInventors: Dilip K. Chatterjee, Arun K. Mehrotra, Jose M. Mir
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Patent number: 4997812Abstract: An Ytrium Barium Copper Oxide-based thick-film paste is disclosed, which when deposited on an alumina substrate is superconducting above the termperature of liquid nitrogen and substantially free of mechanical defects such as cracking or peeling. A method of applying the paste, including the curing process, insures that the YBC superconductor is boned to the substrate.Type: GrantFiled: September 12, 1988Date of Patent: March 5, 1991Assignee: Motorola, Inc.Inventor: Rong F. Huang
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Patent number: 4996190Abstract: Improvement in a superconducting thin film of a superconducting compound oxide containing bismuth (Bi) deposited on a substrate, characterized in that the superconducting thin film is deposited on {110} plane of a single crystal of magnesium oxide (MgO).Type: GrantFiled: June 19, 1989Date of Patent: February 26, 1991Assignee: Sumitomo Electric Industries, Ltd.Inventors: Kenjiro Higaki, Keizo Harada, Naoji Fujimori, Hideo Itozaki, Shuji Yazu
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Patent number: 4994435Abstract: This invention discloses an oxide superconductor shaped body including a noble metal layer formed on at least one surface of an oxide superconductor layer formed on a substrate, and a method of manufacturing oxide superconductor shaped body.Type: GrantFiled: October 11, 1988Date of Patent: February 19, 1991Assignee: The Furukawa Electric Co., Ltd.Inventors: Shoji Shiga, Masanori Ozaki, Ton-Chi Chang, Nakahiro Harada, Masanao Mimura
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Patent number: 4990492Abstract: A method for manufacturing a stress controlled wire comprises the step of twisting superconductor fibers together into a bundle of fibers. A plurality of bundles are then twisted together and disposed within the lumen of a tube and the lumen is flooded with solder which is allowed to harden. The tube and its contents are subsequently heated as they are wound upon a drum to melt the solder and allow realignment of the superconductor fibers within the solder. The subsequent solidification of solder after the tube is wound onto the drum provides an unstressed support for the fiber bundles.Type: GrantFiled: January 3, 1989Date of Patent: February 5, 1991Assignee: General AtomicsInventors: Richard L. Creedon, Yen-Hwa L. Hsu
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Patent number: 4990491Abstract: This invention is a superconductor having a generally substoichiometric oxygen, nickel oxide insulation between superconduction strands. The superconductor is to have an operating temperature below 250 degrees kelvin, and has multiple superconductors, with a cladding of nickel on the strands, and an adherent coating of nickel oxide formed on the outer surface of the cladding. The nickel oxide has stoichiometric or less than stoichiometric oxygen (but not greater than stoichiometric oxygen) to be electrically insulating at the operating temperature of the superconductor. Thus high thermal conductivity strand insulation capable of withstanding strand to strand voltages of greater than 50 volts is provided to substantially eliminate coupling currents between the strands, and nickel oxide having areas of semiconducting due to containing more than stoichiometric oxygen is avoided.Type: GrantFiled: June 29, 1988Date of Patent: February 5, 1991Assignee: Westinghouse Electric Corp.Inventors: George R. Wagner, Adolphus Patterson
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Patent number: 4990487Abstract: The disclosed superconductive optoelectronic device has a substrate, a photoconductive gate region formed on the substrate, and a source region and a drain region formed on the substrate at opposite sides of the gate region so as to face toward each other across the gate region. The source region and the drain region are made of a superconductive material. The gate region is made of such superconductive photoconductive-material, which reveals photoconductivity at a temperature below the transition temperature of the above superconductive material and has a similar general chemical formula to that of the above superconductive material except that concentrations of constituent elements are different. Also disclosed are superconductive optoelectronic devices formed of an organized integration of the above superconductive optoelectronic devices to develop a new field of "Superconductive Opto-Electronics".Type: GrantFiled: March 7, 1989Date of Patent: February 5, 1991Assignee: The University of TokyoInventor: Taizo Masumi
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Patent number: 4988674Abstract: A flexible electrically conductive article is disclosed comprised of an organic film, a conductive crystalline cuprate layer, and a release layer that together form a flexible electrically conductive assembly. The article is prepared by forming a conductive cuprate layer on a refractory substrate with the release interposed. After the cuprate layer is formed, the organic film is bonded to it, permitting the cuprate layer to be stripped intact from the substrate with the organic film. A crystal growth accelerating agent can be associated with the cuprate layer during its formation to minimize the heat energy required for crystallization.Type: GrantFiled: February 9, 1989Date of Patent: January 29, 1991Assignee: Eastman Kodak CompanyInventors: Jose M. Mir, Liang-sun Hung
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Patent number: 4983575Abstract: A superconducting thin film obtained by laminating a Cu-O atomic pair film and another oxide film while growing in one direction shows a higher superconducting critical temperature (Tc). By alternately laminating a thin film of A.sub.2 CuO.sub.4 and a thin film of L.sub.2 CuO.sub.4, wherein A and L are different rare earth elements, the Tc can be enhanced remarkably.Type: GrantFiled: March 24, 1988Date of Patent: January 8, 1991Assignee: Hitachi, Ltd.Inventors: Matahiro Komuro, Yuzo Kozono, Shinji Narishige, Masanobu Hanazono
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Patent number: 4981838Abstract: An electromagnetic resonator has two or more non-intersecting, substantially overlapping surfaces of approximately similar size and shape separated from one another by a distance which is small in comparison to the physical extent of the surfaces. One or more substantially non-intersecting, electrically conductive paths cover substantial portions of each surface. The widths of the paths are substantially smaller than the physical extent of the surfaces. No path on any one of the surfaces is electrically connected to a path on any of the other surfaces. The conductive paths are oriented such that, for each of the surfaces, macroscopic current flows, with respect to the surfaces, in a direction other than the direction in which microscopic current flows in the paths.Type: GrantFiled: February 10, 1989Date of Patent: January 1, 1991Assignee: The University of British ColumbiaInventor: Lorne A. Whitehead
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Patent number: 4980339Abstract: A superconductor structure of very high performance is realized by forming a crystalline coating on a substrate of semiconductor, etc. and epitaxially depositing a crystalline superconductor film of good quality on this crystalline coating. Especially, CaF.sub.2 crystal and ZrO.sub.2 crystal of CaF.sub.2 crystal structure have latice constants which match well with the substrate such as Si, GaAs, etc. and the superconductor. The crystalline coating may be a perovskite material such as BaTiO.sub.3 when the superconductor is a perovskite material.Type: GrantFiled: July 25, 1988Date of Patent: December 25, 1990Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kentaro Setsune, Takeshi Kamada, Hideaki Adachi, Kiyotaka Wasa, Takashi Hirao, Osamu Yamazaki, Hidetaka Higashino
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Patent number: 4975413Abstract: Superconducting composites are made from ceramic-type superconductors coated onto a low resistivity carbon fiber selected from those high strength fibers which have an ultrahigh modulus and high thermal conductivity. Flexible conductors of several different structures made from such composites are described as well as other useful forms of the composites.Type: GrantFiled: August 12, 1987Date of Patent: December 4, 1990Assignee: Amoco CorporationInventors: Larry C. Satek, William F. Bennett, David A. Schulz
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Patent number: 4970197Abstract: An oxide superconductor including an oxide superconductor member and a hermetical seal layer, coated over the oxide superconductor member, for hermetically sealing the oxide superconductor member from the atmosphere.Type: GrantFiled: April 22, 1988Date of Patent: November 13, 1990Assignee: Fujikura Ltd.Inventors: Takao Shiota, Hiroshi Hidaka, Koichi Takahashi, Masahiro Sato, Osamu Fukuda
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Patent number: 4970395Abstract: A photon detector based upon photon-assisted tunneling in superconductor-insulator-superconductor or super-Schottky structures, in which the superconductor is a high transition temperature superconductor. An electrical bias is provided on either side of such structures so that photo-assisted tunneling, in the presence of incident photons on the structure, can occur to thereby permit a tunneling current therebetween.Type: GrantFiled: December 23, 1988Date of Patent: November 13, 1990Assignee: Honeywell Inc.Inventor: Paul W. Kruse, Jr.
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Patent number: 4968664Abstract: A superconductive ceramic thin film-formed single-crystal wafer comprising a single-crystal wafer, an intermediate ceramic thin film formed on a surface of the single-crystal wafer, and a superconductive ceramic thin film formed on the intermediate ceramic thin film. The intermediate ceramic thin film comprises, as a main phase, a crystalline phase having a composition by atomic ratio of Bi.sub.2 Sr.sub.2 Ca.sub.x O.sub.y (provided that x: 1 to 2; and y: 6 to 7), and the superconductive ceramic thin film comprises, as a main phase, a crystalline phase having a composition by atomic ratio selected from the group consisting of Bi.sub.2 Sr.sub.2 Ca.sub.1 Cu.sub.2 O.sub.8 and Bi.sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.10. Alternatively, the intermediate ceramic thin film comprises, as a main phase, a crystalline phase having a composition by atomic ratio selected from the group consisting of Tl.sub.1 Ba.sub.2 Ca.sub.s O.sub.t (provided that s: 1 to 2; and t: 4.5 to 5.5) and Tl.sub.2 Ba.sub.2 Ca.sub.v O.sub.Type: GrantFiled: August 9, 1989Date of Patent: November 6, 1990Assignee: Mitsubishi Metal CorporationInventors: Tadashi Sugihara, Takuo Takeshita
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Patent number: 4965247Abstract: A superconducting coil comprising a support (1,10) and at least one ring-shaped and/or spiral turn (2) of superconductor which is composed of superconducting compound oxide and is supported on a surface of said support.Type: GrantFiled: July 5, 1988Date of Patent: October 23, 1990Assignee: Sumitomo Electric Industries, Ltd.Inventor: Masanori Nishiguchi
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Patent number: 4962086Abstract: High T.sub.c oxide superconductive films can be formed on gallate layers, where the gallate layers include a rare earth element or a rare earth-like element. Combinations of rare earth elements and rare earth-like elements can also be utilized. The superconductive films can be epitaxially deposited on these gallate layers to form single crystals or, in the minimum, highly oriented superconductive layers. Any high T.sub.c superconductive oxide material can be utilized, but the best lattice matches are to superconductive materials including copper oxides. Examples include Y-Ba-Cu-O systems, Bi-based systems and Tl-based systems.Type: GrantFiled: June 8, 1988Date of Patent: October 9, 1990Assignee: International Business Machines CorporationInventors: William J. Gallagher, Edward A. Giess, Aranava Gupta, Robert B. Laibowitz, Eugene J. O'Sullivan, Robert L. Sandstrom
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Patent number: 4959345Abstract: A method for manufacturing a superconducting device comprises the steps of forming a passivation film by photo chemical vapor deposition on the surface of an oxide superconducting material; and then adding oxygen into the oxide superconducting material by ion injection.This patent application is related to the copending U.S. Pat. application entitled "Method of Adding a Halogen Element Into Oxide Superconducting Materials by Ion Injection" Ser. No. 190,352, filed May 5, 1988, now U.S. Pat. No. 4,916,116.Type: GrantFiled: April 27, 1988Date of Patent: September 25, 1990Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventor: Shunpei Yamazaki
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Patent number: 4959346Abstract: A composite is produced comprised of Y--Ba--Cu--O superconductive film having a zero resistance transition temperature of at least about 38 K, a zirconium dioxide film and a substrate wherein the zirconium dioxide film is intermediate the superconductive film and the substrate.Type: GrantFiled: May 22, 1989Date of Patent: September 25, 1990Assignee: General Electric CompanyInventors: Antonio Mogro-Campero, Larry G. Turner
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Patent number: 4957900Abstract: A superconducting ceramic film is deposited on a substrate sputtering. In virtue of the low thermal conductivity of ceramic, a laser beam is radiated to the ceramic film in order to remove the irradiated portion by sublimation and produce a pattern on the ceramic film.Type: GrantFiled: March 28, 1988Date of Patent: September 18, 1990Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventor: Shumpei Yamazaki
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Patent number: 4956335Abstract: A patterned crystalline superconducting layer is formed by first providing a copper oxide lift-off layer under an amorphous metal oxide superconducing precursor layer and then photolithographically forming a pattern in the layers. The patterned layers are then heat treated to form the final crystalline superconducting layer.Type: GrantFiled: June 20, 1988Date of Patent: September 11, 1990Assignee: Eastman Kodak CompanyInventors: John A. Agostinelli, Gerrit Lubberts
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Patent number: 4954480Abstract: A multi-layer superconducting circuit substrate, including insulating layers, and interconnection patterns of a superconductive ceramic material located between the insulating layers, the patterns of the superconductive ceramic material being connected via through-holes of the superconductive ceramic material, is provided. The patterns of the superconductive ceramic material are preferably encapsulated with a metal of gold, silver, platinum or an alloy thereof.Type: GrantFiled: April 27, 1988Date of Patent: September 4, 1990Assignee: Fujitsu LimitedInventors: Yoshihiko Imanaka, Takato Machi, Kazunori Yamanaka, Hiromitsu Yokoyama, Nobuo Kamehara, Koichi Niwa
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Patent number: 4954481Abstract: Superconductor-polymer composite materials comprise a matrix formed of a rmoplastic polymer and a superconductor powder dispersed in the matrix. The superconductor powder preferably has a composition RBa.sub.2 Cu.sub.3 O.sub.7-x wherein R is a rare earth metal and x is less than or equal to 1. The thermoplastic polymer matrix comprises a vinylidene fluoride homopolymer or copolymer. The composite materials may be formed as shaped products, sheets or films.Type: GrantFiled: December 29, 1988Date of Patent: September 4, 1990Assignee: The United States of America as represented by the Secretary of CommerceInventors: Aime S. DeReggi, Chwan-Kang Chiang, George T. Davis
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Patent number: 4948779Abstract: Superconductive thin layer of YBa.sub.2 Cu.sub.3 O.sub.7-.delta. in which reactions with the substrate are prevented in that at least the surface of the substrate consists of a compound having such a composition that in the Y.sub.2 O.sub.3 -BaO-CuO phase diagram it is situated on a segregation line with YBa.sub.2 Cu.sub.3 O.sub.7-.delta. as shown in FIG. 1.Type: GrantFiled: July 26, 1988Date of Patent: August 14, 1990Assignee: U.S. Philips CorporationInventors: Wilhelmus C. Keur, Cornelis A. H. A. Mutsaers, Henricus A. M. Van Hal
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Patent number: 4943559Abstract: A temperature sensor comprises a thin layer of material the composition of which varies gradually over the layer thickness. The material is superconductive below a critical temperature the value of which depends on the composition of the material. The layer is connected, by means of electrodes to an electronic circuit for supplying current to the sensor and processing a temperature-dependent signal produced by the sensor.Type: GrantFiled: February 27, 1989Date of Patent: July 24, 1990Assignee: U.S. Philips CorporationInventors: Jan W. Severin, Gijsbertus De With
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Patent number: 4942142Abstract: An outer surface of a superconducting thin film of compound oxide such as YBa.sub.2 Cu.sub.3 O.sub.7-.delta. deposited on a substrate such as MgO and SrTiO.sub.3 is protected with a protective layer which is composed of polymer compound such as polyimide, silicon resin or epoxy resin.Type: GrantFiled: July 27, 1988Date of Patent: July 17, 1990Assignee: Sumitomo Electric Industries Ltd.Inventors: Hideo Itozaki, Saburo Tanaka, Nobuhiko Fujita, Shuji Yazu, Tetsuji Jodai
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Patent number: 4937226Abstract: A large number of small superconducting solenoids are produced on a common substrate simultaneously. Two parallel slits (5) passing through a silicon wafer are dug in such manner that a core (10) is left between the slits and then a superconducting thin film of compound oxide is deposited around the core (10).Type: GrantFiled: July 18, 1988Date of Patent: June 26, 1990Assignee: Sumitomo Electric Industries, Ltd.Inventor: Masanori Nishiguchi
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Patent number: 4937227Abstract: Thin-film magnetic head including an inductive transducing element (15) and a face (3) for magnetic flux coupling of the transducing element with a magnetic recording medium. A first magnetically permeable layer (5) and a second similar layer (7) together constitute a transducing gap (11). To improve the transducing function a layer (21) of a superconducting material is provided between the layers (5) and (7).Type: GrantFiled: July 12, 1988Date of Patent: June 26, 1990Assignee: U.S. Philips Corp.Inventors: Ulrich E. Enz, Jacobus J. M. Ruigrok, Victor Zieren
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Patent number: 4929597Abstract: A superconductor according to the present invention contains an internal stress absorbing substance of a copper oxide and/or a barium oxide distributed over the superconductive oxide, so that the superconductor is free from cracks due to thermal stresses produced in a heat treatment.Type: GrantFiled: March 27, 1989Date of Patent: May 29, 1990Assignee: Mitsubishi Metal CorporationInventors: Takuo Takeshita, Tadashi Sugihara, Shuichi Fujino
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Patent number: 4921833Abstract: A superconducting member comprising a first film including least a single ceramic layer formed on the surface of a substrate of an arbitrary base material. A film of an oxide superconductor is formed on the first film. In a useful embodiment, the substrate is stainless steel, and the first ceramic layer by zirconium oxide. This superconducting member can be formed as a superconducting tape, a superconducting wire or the like.Type: GrantFiled: May 25, 1988Date of Patent: May 1, 1990Assignee: Sumitomo Electric Industries, Ltd.Inventor: Satoshi Takano
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Patent number: 4918050Abstract: An arrangement for a superconducting resonator suitable for use in electronic filters is disclosed, in which a resonator exhibits an increased amount of internal inductance without a lengthening of the resonator. By utilizing a relatively thin dielectric material, a significant amount of magnetic field is made to exist in a layer of the superconductors nearest to the dielectric. This magnetic field induces a non-negligible internal inductance within the layer. The net result of having this extra inductance is that the wave velocity is no longer a constant, independent of dielectric thickness. Thus the resonator can be constructed to be significantly shorter than the conventional wave velocity equation would imply. Hence, the present invention provides a reduction in the length as well as in the cross-sectional area of a resonator, which means that one or more of such resonators may then be advantageously utilized to achieve significantly reduced filter size.Type: GrantFiled: April 4, 1988Date of Patent: April 17, 1990Assignee: Motorola, Inc.Inventor: Lawrence Dworsky
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Patent number: 4918049Abstract: The structures for confining or guiding high frequency electromagnetic radiation have surfaces facing the radiation constructed of high temperature superconducting materials, that is, materials having critical temperatures greater than approximately 35.degree.K. The use of high temperature superconductors removes the constraint of the relatively low energy gaps of conventional, low temperature superconductors which precluded their use at high frequencies. The high temperature superconductors also provide larger thermal margins and more effective cooling. Devices which will benefit from the structures of the invention include microwave cavities, millimeter-wave/far infrared cavities, gyrotron cavities, mode converters, accelerators and free electron lasers, and waveguides.Type: GrantFiled: November 18, 1987Date of Patent: April 17, 1990Assignee: Massachusetts Institute of TechnologyInventors: Daniel R. Cohn, Leslie Bromberg, Benjamin Lax, Ward D. Halverson, Paul P. Woskov
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Patent number: 4916116Abstract: A method of adding a halogen element into oxide superconducting materials includes the steps of forming a passivation film on an oxide superconducting material, adding halogen ions into the oxide superconducting material by ion injection and then applying a heat treatment in oxygen to the oxide superconducting material.Type: GrantFiled: May 5, 1988Date of Patent: April 10, 1990Assignee: Semiconductor Energy Laboratory Co., Ltd.Inventor: Shunpei Yamazaki
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Patent number: 4912086Abstract: An electroacoustic transducer comprises a terminal (1-1'), a voice coil (2) coupled to the terminal, and a diaphragm (4). The transducer further comprises an element (other than the voice coil) made of a superconducting material which cooperates with the voice coil (2) to provide electromechanical conversion of an electric signal appearing at the terminal (1-1') into vibrations of the diaphragm, or vice versa.Type: GrantFiled: November 19, 1987Date of Patent: March 27, 1990Assignee: U.S. Philips CorporationInventors: Ulrich E. Enz, Albert A. Comberg, Norbert E. F. Hansen
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Patent number: 4908347Abstract: An AC electrical machine which includes a superconducting, diamagentic flux shield cylinder enclosing the stator windings such that the magnetic flux produced by the machine's rotor is bottled within the flux shield.Type: GrantFiled: July 7, 1988Date of Patent: March 13, 1990Assignee: Allied-Signal Inc.Inventor: Joseph Denk
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Patent number: 4908348Abstract: A barrier layer triad intended to protect a silicon substrate and an overlying conductive layer from mutual contamination is disclosed as well as a process for its preparation. The barrier layer triad is comprised of a first triad layer located adjacent the silicon substrate consisting essentially of silica, a third triad layer remote from the silicon substrate consisting essentially of at least one Group 4 heavy metal oxide, and a second triad layer interposed between the first and third triad layers consisting essentially of a mixture of silica and at least one Group 4 heavy metal oxide.Type: GrantFiled: February 8, 1988Date of Patent: March 13, 1990Assignee: Eastman Kodak CompanyInventors: Liang-Sun Hung, John A. Agostinelli
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Patent number: 4906607Abstract: A sensor and method for indicating the presence of a low magnetic field using high critical temperature superconductor ceramic material is comprised of a sensing element consisting essentially of the high critical temperature superconductor ceramic material without the need for further processing. The sensing element is cooled to a temperature below the critical temperature of the superconductor material, whereby the sensing element becomes superconducting. Electromagnetic energy is applied to the sensing element, a first portion of the energy being absorbed by the sensing element. The amount of the energy absorbed by the sensing element is detected. The sensing element is modulated to provide a reference signal and is biased to a predetermined absorption reference value, whereby a magnetic field of about 10.sup.Type: GrantFiled: April 6, 1988Date of Patent: March 6, 1990Assignee: Drexel UniversityInventor: Som Dev Tyagi