Heat Decomposition Of Applied Coating Or Base Material Patents (Class 427/226)
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Patent number: 6074962Abstract: Disclosed is a method for the formation of a silica-based coating film of a relatively large thickness in the manufacturing process of semiconductor devices and liquid crystal display panels by repeating the sequence consisting of coating of the surface with a coating solution containing a partial hydrolysis-condensation product of a trialkoxy silane compound followed by drying until a desired overall thickness of the coating film is obtained prior to a final baking treatment at 350 to 500.degree. C . The invention provides an improvement obtained by an ultraviolet irradiation treatment of the coating film intervening between a sequence of coating and drying and the next sequence of coating and drying so that the adhesion between the coating layers formed by repeating the sequence of coating and drying can be improved along with an advantage of absence of pinholes in the coating film.Type: GrantFiled: May 1, 1998Date of Patent: June 13, 2000Assignee: Tokyo Ohka Kogyo Co., Ltd.Inventors: Yoshinori Sakamoto, Yoshio Hagiwara
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Patent number: 6071570Abstract: A method of preparing electrodes is now described, which electrodes have enhanced adhesion of subsequently applied coatings combined with excellent coating service life. In the method, a substrate metal, such as a valve metal as represented by titanium, is provided with a highly desirable rough surface characteristic for subsequent coating application. This can be achieved by various operations including etching to ensure a roughened surface morphology. In subsequent operations, a barrier layer is provided on the surface of enhanced morphology. This may be achieved by operations including heating, as well as including thermal decomposition of a layer precursor. Subsequent coatings provide enhanced lifetime even in the most rugged commercial environments.Type: GrantFiled: August 27, 1997Date of Patent: June 6, 2000Assignee: Eltech Systems CorporationInventors: Kenneth L. Hardee, Lynne M. Ernes, Richard C. Carlson
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Patent number: 6071464Abstract: A process for modifying the surface of a base metal formed from a hard material instead of forming a coating film thereon comprises compacting a powder of a hard material, baking the compacted product, dipping the baked product in an alkoxide containing titanium, and sintering the alkoxide-covered baked product in a nitrogen gas atmosphere. The sintered product has very hard titanium carbide, nitride or carbide-nitride particles deposited on the base metal surface. The particles are partly embedded in the base metal and partly protrude from its surface, and are, therefore, very unlikely to come off, while they withstand a temperature change very well.Type: GrantFiled: February 10, 1998Date of Patent: June 6, 2000Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Mitsuhiro Funaki, Mitsuo Kuwabara, Kazuhito Hiraga, Tetsuya Ohishi
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Patent number: 6068926Abstract: The invention relates to a carbon brush, which is impregnated with a modified siloxane.Type: GrantFiled: July 14, 1997Date of Patent: May 30, 2000Assignee: Schunk Kohlenstofftechnik GmbHInventors: Rainer Sperling, Harald Friedrich, Gunter Schardt
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Patent number: 6063442Abstract: A process for bonding a porous material having an opened porous cellular structure to a substrate material, the process including the steps of: conditioning the substrate with tantalum in a reactor at 925.degree. C. having a tantalum source pot at 550.degree. C.; affixing the porous material to the conditioned substrate to form an affixed composite structure by clamping the porous material to the conditioned substrate; and, subjecting the composite structure to a chemical vapor deposition process (CVD) which uses tantalum as a source material for a time sufficient to CVD bond the porous material to the conditioned substrate material.Type: GrantFiled: October 26, 1998Date of Patent: May 16, 2000Assignee: Implex CorporationInventors: Robert C. Cohen, Joseph R. Vargas
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Patent number: 6060112Abstract: A color cathode ray tube is disclosed in which a coating containing an aluminum-phosphorus compound and fine particles of at least one of tungsten oxide and bismuth oxide is formed on the surface of a shadow mask on the side of an electron gun.Type: GrantFiled: September 11, 1998Date of Patent: May 9, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Sachiko Muramatsu, Yasuhisa Ohtake
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Patent number: 6060165Abstract: A metal powder having a vitreous thin layer on at least a part of the surface thereof wherein the amount of the vitreous thin layer is preferably 0.01 to 50% by weight based on the metal powder without the vitreous thin layer. The metal powder is prepared by a process comprising the steps of: bringing a solution comprising a heat-decomposable metal compound to fine droplets; and heating the droplets to a temperature above the decomposition temperature of the metal compound, wherein a precursor of an oxide, heat-decomposable to produce a vitreous material which, together with the metal, does not form a solid solution, is added to the solution and the vitreous material is deposited, upon the heating, in the vicinity of the surface of the metal powder. The powder is useful for the preparation of a thick film paste used in a multilayer ceramic electronic component or substrate, since it has an excellent oxidation resistance during storage, in a conductor paste, and during firing of the paste.Type: GrantFiled: September 23, 1997Date of Patent: May 9, 2000Assignee: Shoei Chemical Inc.Inventors: Eiichi Asada, Yuji Akimoto, Fumiyuki Shimizu, Kazuro Nagashima
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Patent number: 6057030Abstract: A porous ceramic body having a ceramic framework is produced having a surface roughness of about 40 microns or less. The ceramic body has a plurality of pores where each pore is interconnected with at least one adjacent pore. The ceramic body is made from a powdered ceramic component and a pore-forming polymeric component such as polymeric beads. The ceramic component is alumina which can contain at least one other component selected from the group consisting of calcium oxide, silicon oxide, magnesium oxide, barium oxide, titanium dioxide, and zirconium dioxide. The pore-forming polymeric beads, such as polymethylmethacrylate beads, each having a particle size of 100 microns or less, are mixed with the ceramic powder. The powdered mixture is compressed under pressure and heated to form a porous ceramic body. A coating of an aqueous dispersion of a metal oxide can be applied to the surface of the ceramic body and heated to produce a smooth and durable coating.Type: GrantFiled: August 18, 1997Date of Patent: May 2, 2000Assignee: Kanebo Ltd.Inventor: Toshimasa Mano
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Patent number: 6056994Abstract: A precursor liquid comprising several metal 2-ethylhexanoates, such as strontium, tantalum, and bismuth 2-ethylhexanoates, in a xylenes/methyl ethyl ketone solvent is prepared, and deposited on a substrate. In one embodiement the substrate is placed within a vacuum deposition chamber, the precursor liquid is misted, and the mist is flowed into the deposition chamber while maintaining the chamber at ambient temperature to deposit the precursor liquid on the substrate. In another embodiment, the precursor is spin-coated on the substrate. The liquid is dried, baked, and annealed to form a thin film of a layered superlattice material, such as strontium bismuth tantalate, on the substrate.Type: GrantFiled: June 7, 1995Date of Patent: May 2, 2000Assignee: Symetrix CorporationInventors: Carlos A. Paz de Araujo, Larry D. McMillan, Michael C. Scott, Joseph D. Cuchiaro
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Patent number: 6056907Abstract: A debonding layer is formed on fibers such as silicon carbide fibers by fing a thin film of a metal such as nickel or iron on the silicon carbide fibers and then annealing at a temperature of about 350-550.degree. C. to form a debond layer of a metal silicide and carbon. These fibers having the debond coating can be added to composite forming materials and the mixture treated to form a consolidated composite. A one heating-step method to form a consolidated composite involves inserting the silicon carbide fibers with just the initial metal film coating into the composite forming materials and then heating the mixture to form the debond coating in situ on the fibers and to form the consolidated composite. Preferred heating techniques include high temperature annealing, hot-pressing, or hot isostatic pressing (HIP).Type: GrantFiled: March 31, 1997Date of Patent: May 2, 2000Assignee: The United States of America as represented by the Secretary of the NavyInventors: Richard K. Everett, Alan S. Edelstein, John H. Perepezko
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Patent number: 6057031Abstract: The invention relates to a composite composed of a plastic substrate and a thin, continuous metal-containing layer, characterised in that the metal-containing layer is ductile, adheres firmly to the plastic substrate, has a thickness of <2 .mu.m and is composed of a compound corresponding to the formulaM.sub.a O.sub.b C.sub.x N.sub.y B.sub.zwherein:M means one or more metals from the group comprising Ti, Ta, Nb, Zr and Hf,a=0.025 to 0.9b=0.025 to 0.7x=0.2 to 0.9y=0 to 0.7z=0 to 0.7a+b+x+y+z=1provided that the value of a, starting from the substrate surface, increases from a value approximating zero towards to the layer surface, and at least 50% of the carbon atoms at the base of the layer are bound to other carbon atoms by C--C bonds.Type: GrantFiled: August 21, 1998Date of Patent: May 2, 2000Assignee: GfE Metalle und Materialien GmbH.Inventors: Frank Breme, Volker Guether, Karl-Uwe van Osten
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Patent number: 6051272Abstract: The present invention provides a method for growing or depositing artificial bone materials called organoapatites on a metal surgical alloy. The method involves pretreating the alloy with at least one aqueous solution of a poly(amino acid). After this pretreatment step, the organoapatites can be synthesized onto the alloy. Because most surgical implants are made from metal alloys, this method can be used to make implants which contain organoapatites may promote the formation of natural bone when placed into a human patient in vivo.Type: GrantFiled: February 9, 1999Date of Patent: April 18, 2000Assignee: The Board of Trustees of the University of IllinoisInventors: Samuel I. Stupp, Julia Hwang
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Patent number: 6051287Abstract: Relatively cool chemical vapor deposition precursor particles are desorbed from a target by increasing the temperature of a selected target area at a heating rate of at least about 10.sup.6 K/sec such that heat energy causes the desorption of at least one CVD precursor particle intact from the target, such that intermediate bonds between the precursor particles and adjacent particles are heated at a higher rate than the precursor's internal bonds, or such that a substantial portion of heat energy is not transferred to the internal modes of the CVD precursor particle.Type: GrantFiled: June 20, 1997Date of Patent: April 18, 2000Assignee: Micron Technology, Inc.Inventor: Eugene P. Marsh
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Patent number: 6048574Abstract: A powder comprising a metal or metallic compound core having thereon at least one metal or metallic oxide layer having a uniform thickness of from 0.01 .mu.m to 20 .mu.m, wherein the metal of the metal or metallic oxide layer is different from the metal constituting the metal or metallic compound core and a process for preparing the same.Type: GrantFiled: November 24, 1997Date of Patent: April 11, 2000Assignee: Nittetsu Mining Co., Ltd.Inventors: Takafumi Atarashi, Hiroki Okudera
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Patent number: 6042884Abstract: An aqueous ruthenium chloride solution for blackening ceramic surfaces includes ruthenium chloride; water present in an amount effective to provide an aqueous solution of ruthenium chloride; and a buffer which is selected from the group consisting of sodium acetate, sodium propionate, potassium acetate, potassium propionate, and mixtures thereof, and which is present in an amount effective to provide the aqueous solution with a pH of at least 1.5. A method for dyeing a ceramic surface includes applying the aqueous solution of ruthenium chloride to a ceramic surface by at least one of spraying, dipping, painting and printing to provide a treated surface; drying and firing the treated surface at a temperature ranging from about 300 to about 1400.degree. C. for a period of time ranging from one half hour to five hours; and grinding and polishing the treated surface to even out the treated surface.Type: GrantFiled: April 30, 1998Date of Patent: March 28, 2000Assignee: BK Giulini Chemie GmbHInventors: Thomas Klein, Thomas Staffel, Lysander Fischer
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Patent number: 6042883Abstract: The present invention provides a method for making a high temperature coating comprising applying to a surface a precursor polymer which decomposes to a substantially pure product selected from the group consisting of a refractory metal carbide and a refractory metal boride, and exposing the precursor polymer to conditions effective to decompose the precursor polymer to said substantially pure product.Type: GrantFiled: October 3, 1997Date of Patent: March 28, 2000Assignee: Southwest Research InstituteInventors: Partha P. Paul, Stuart T. Schwab
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Patent number: 6040008Abstract: A process for forming a uniform, boron nitride coating on a boron-doped, refractory carbide body, and in particular on a sintered, boron-doped, silicon carbide fiber, where the body is exposed to a nitrogen-containing atmosphere at a temperature equal to or greater than the densification or sintering temperature. The coated fibers exhibit no loss in strength properties and show improved creep resistance.Type: GrantFiled: May 21, 1998Date of Patent: March 21, 2000Assignee: University of FloridaInventor: Michael D. Sacks
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Patent number: 6036889Abstract: The present invention relates to a thick film formed of a mixture of metal powders and metallo-organic decomposition (MOD) compounds in an organic liquid vehicle and a process for advantageously applying them to a substrate by silk screening or other printing technology. The mixtures preferably contain metal flake with a ratio of the maximum dimension to the minimum dimension of between 5 and 50. The vehicle may include a colloidal metal powder with a diameter of about 10 to about 40 nanometers. The concentration of the colloidal metal in the suspension can range from about 10 to about 50% by weight. The MOD compound begins to decompose at a temperature of approximately about 200.degree. C. to promote consolidation of the metal constituents and bonding to the substrate which is complete at temperatures less than 450.degree. C. in a time less than six minutes.Type: GrantFiled: March 3, 1998Date of Patent: March 14, 2000Assignee: Parelec, Inc.Inventor: Paul H. Kydd
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Patent number: 6027796Abstract: The present invention provides a ceramic film with a variety of structures having one-dimensional through channels which can be utilized favorably in the separation of molecules or microparticles or as a support film for a catalyst with a large surface area or for a catalyst of high activity, and also provides a method for manufacturing this film efficiently and with good reproducibility, and the present invention relates to a ceramic film having one-dimensional through channels, which is a porous ceramic film having nanometer-size pores that go through one-dimensionally from one surface of the film to the other surface, characterized in that the porous ceramic film is formed on a substrate of glass, ceramic, or a heat-resistant metal; and relates to a method for manufacturing the above-mentioned ceramic film.Type: GrantFiled: December 18, 1997Date of Patent: February 22, 2000Assignees: Japan as represented by Director General of Agency of Industrial Science and Technology, Fine Ceramics Research AssociationInventors: Shinji Kondoh, Shin-ichi Hirano, Koichi Kikuta
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Patent number: 6027766Abstract: A method and article are disclosed wherein a substrate is provided with a photocatalytically-activated self-cleaning surface by forming a photocatalytically-activated self-cleaning coating on the substrate by spray pyrolysis chemical vapor deposition or magnetron sputter vacuum deposition. The coating has a thickness of at least about 500 Angstroms to limit sodium-ion poisoning to a portion of the coating facing the substrate. Alternatively, a sodium ion diffusion barrier layer is deposited over the substrate prior to the deposition of the photocatalytically-activated self-cleaning coating to prevent sodium ion poisoning of the photocatalytically-activated self-cleaning coating. The substrate includes glass substrates, including glass sheet and continuous float glass ribbon.Type: GrantFiled: July 23, 1997Date of Patent: February 22, 2000Assignee: PPG Industries Ohio, Inc.Inventors: Charles B. Greenberg, Caroline S. Harris, Vincent Korthuis, Luke A. Kutilek, David E. Singleton, Janos Szanyi, James P. Thiel
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Patent number: 6025020Abstract: Amorphous, highly dispersed ruthenium oxide having a high energy storage capacity may be prepared using high surface area carbon as carbon powder or as carbon fibers as a template for the ruthenium oxide. The process avoids the disadvantages of a sol-gel process, and utilizes deposition of a ruthenium source within the pores of carbon fibers dispersed in a cellulose matrix. The ruthenium source subsequently is converted to amorphous ruthenium oxide hydrate by heating in a steam atmosphere containing at least 30 weight percent water at temperatures up to about 500.degree. C.Type: GrantFiled: October 8, 1997Date of Patent: February 15, 2000Inventors: Zheng Chen, Millard Franklin Rose
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Patent number: 6022819Abstract: Porcelain compositions of the present invention comprise one or more glass or glass-ceramic powder components. Additionally, one or more opacifying agents, pigments, fluorescing agents and the like may be included in the composition. Based on volume percent, 10% of the particulate in the porcelain has a particle size of less than between about 1.1 microns and about 1.5 microns, 50% of the particulate in the porcelain has a particle size of less than between about 3 and about 6 microns, 90% of the particulate in the porcelain has a particle size of less than between about 8 and about 13.5 microns, and the maximum particle size of the particulate is greater than about 20 microns and less than about 60 microns. The mean particle size is preferably in the range of about 3.0 microns to about 6.5 microns.Type: GrantFiled: July 17, 1998Date of Patent: February 8, 2000Assignee: Jeneric/Pentron IncorporatedInventors: Paul Panzera, Jana Pruden, Dmitri Brodkin, Lisa M. Kaiser, Richard A. Brightly, Carlino Panzera
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Patent number: 6017579Abstract: A new method (P200) is provided for making magnesium oxide layers (122) in plasma displays (100). A magnesium carboxylate liquid precursor solution is applied to a display panel (102), dried, and annealed to yield a solid magnesium oxide layer (122) having excellent electro-optical performance.Type: GrantFiled: April 14, 1997Date of Patent: January 25, 2000Assignees: Symetrix Corporation, Matsushita Electronics CorporationInventors: Gota Kano, Carlos A. Paz De Araujo, Koji Arita, Michael C. Scott, Larry D. McMillan, Shinichiro Hayashi
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Patent number: 6015517Abstract: A ceramic contact sheet and setter tile with controlled porosity is introduced, along with the method for making the same. The amount of porosity is controlled by the volume percentage, particle size, and particle shape of a fugitive phase which can be added to the original refractory material slurry used to fabricate setter tiles and contact sheets. The fugitive phase can be used independently to introduce porosity in setter tiles and contact sheets or in conjunction with partial densification. Since porosity is not solely dependent upon partial sintering, higher porosity levels can be achieved with less impact on subsequent mechanical properties of the resultant refractory material.Type: GrantFiled: April 8, 1998Date of Patent: January 18, 2000Assignee: International Business Machines CorporationInventor: Jon A. Casey
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Patent number: 6015587Abstract: A process for manufacturing a phosphorescent screen for use in a cathode ray or field emission display, is described. The phosphor layer is applied in the form of a slurry consisting of a powdered phosphor, an ethylene glycol monobutyl ether acetate solvent, and a cellulose acetate butyrate binder. The phosphor concentration is between 30 and 60% by weight, the solvent between 5 and 52.5% and the binder between 17.5 and 35%. If the slurry composition falls within these ranges, then, once the aluminum anode layer is in place, all organic material can be removed by firing at a temperature that is less than 500.degree. C. By keeping the firing temperature below 500.degree. C., roughening of the undersurface of the aluminum is avoided and a more efficient screen is obtained. Data to illustrate this is also provided.Type: GrantFiled: March 16, 1998Date of Patent: January 18, 2000Assignee: Industrial Technology Research InstituteInventors: Yui-Shin Fran, De-An Chang, Chih-Hao Tien
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Patent number: 6013334Abstract: The present invention provides a method for forming a thicker thin film of complex compound easily without causing cracks in the film. Sol solution is coated and dehydrated on an upper surface of a substrate by sol-gel method (step S1, S2). A thin film formed on the upper surface of the substrate is exposed by radiation which has predetermined energy (step S3). Thus, the thin film of complex compound is polymerized, cracks are not caused even in forming a thicker thin film.Type: GrantFiled: November 26, 1997Date of Patent: January 11, 2000Assignee: Rohm Co. Ltd.Inventor: Akira Kamisawa
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Patent number: 6010969Abstract: A method of forming a film on a substrate using chemical vapor deposition techniques and carboxylate complexes. The complexes and method are particularly suitable for the preparation of semiconductor structures.Type: GrantFiled: October 2, 1996Date of Patent: January 4, 2000Assignee: Micron Technology, Inc.Inventor: Brian A. Vaartstra
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Patent number: 6007868Abstract: A method is described of manufacturing ferroelectric bismuth-titanate layers Bi.sub.4 Ti.sub.3 O.sub.12 on a substrate, A solution containing bismuth and titanium is provided, in a stoichiometric ratio, in the form of a metallo-organic or inorganic compound which is homogeneously mixed in an organic solvent, being brought into contact with the substrate and thermally treated at a temperature in the range from 500.degree. C. to 650.degree. C., thereby forming bismuth-titanate Bi.sub.4 Ti.sub.3 O.sub.12.Type: GrantFiled: November 12, 1993Date of Patent: December 28, 1999Assignee: U.S. Philips CorporationInventors: Mareike Klee, Wolfgang Brand, Henricus A.M. Van Hal
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Patent number: 6005705Abstract: A description is given of electrochromic thin-film systems and their components, especially an improved electrochromic thin-film based on tungsten oxide and/or molybdenum oxide into which alkali metal ions are incorporated, an electrolyte which is improved in particular with respect to its conductivity and is based on pre-hydrolysed, organically modified alkoxysilane and on organic diol (triol), and an improved process for producing a noncolouring ion insertion layer based on cerium oxides and titanium oxides.Type: GrantFiled: April 9, 1997Date of Patent: December 21, 1999Assignee: Institut fuer Neue Materialien Gemeinnuetzige GmbHInventors: Helmut Schmidt, Herbert Krug, Norbert Merl, Anke Moses, Patrick Judeinstein, Anette Berni
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Patent number: 6004686Abstract: The present invention provides an electroluminescent material that includes phosphor particles with an overlaying coating of a conductive inorganic oxide.Type: GrantFiled: March 23, 1998Date of Patent: December 21, 1999Assignee: Micron Technology, Inc.Inventors: Robert T. Rasmussen, David A. Cathey
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Patent number: 6001477Abstract: A method for providing an adherent, continuous, conformal, non-particulate coating of a compound of a metal or metalloid on the surface of individual phosphor particles. The method involves wetting each of the individual particles with a polymer solution including a polymer in a solvent base, the polymer being capable of chelating ions of the metal or metalloid. The particles then are dried to produce a continuous coating of the polymer on each of the individual particles. The polymer-coated phosphor particles are suspended in a solution containing ions of the metal or metalloid and having a pH of at least 9 to produce chelation of the metal or metalloid ions by the polymer coating, to produce the adherent, continuous, conformal, non-particulate, metal- or metalloid-compound coating on the particle surfaces. Also described are a method for improving lumen maintenance of a lamp, a coated phosphor powder, and a phosphor-coating composition for coating an inner surface of a lamp envelope.Type: GrantFiled: January 3, 1997Date of Patent: December 14, 1999Assignee: Osram Sylvania Inc.Inventors: Chung Nin Chau, Tracy V. Silloway, Paul W. Salvi
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Patent number: 6001416Abstract: An oxide thin film comprising an oxide represented by ABO.sub.3, wherein A comprises at least one element selected from the group consisting of the groups IA, IIA, IIIA, IVB and VB of the periodic table, and B comprises at least one element selected from the group consisting of the groups IVA and VA of the periodic table, wherein said oxide thin film has a mixed structure in which crystal grains are dispersed in an amorphous phase or an ultrafine grain phase. The oxide thin film is prepared by preparing an organic solvent solution (1) of a metal alkoxide compound of A and a metal alkoxide compound of B; adding water, or water and a catalyst to the organic solvent solution (1) to prepare a solution (2); mixing the organic solvent solution (1) and the solution (2) to prepare a mixed solution; coating the mixed solution on a substrate to form a thin film; and subjecting the thin film to heat treatment.Type: GrantFiled: November 12, 1998Date of Patent: December 14, 1999Assignee: Fuji Xerox Co., Ltd.Inventors: Hiroaki Moriyama, Keiichi Nashimoto
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Patent number: 5993901Abstract: Thin films of the lead titanate system expressed by the general formula: Pb(Zr.sub.x Ti.sub.1-x)O.sub.3, where 0.ltoreq.x<1, are produced by (a) preparing a complex alkoxide including at least lead and titanium atoms by a liquid-phase reaction of lead carboxylate with at least one alkoxide of titanium and zirconium alkoxides, (b) dissolving the resultant complex alkoxide in water to prepare an aqueous solution of the complex alkoxide, and (c) immersing a substrate in the resultant aqueous solution to deposit a thin film of the lead titanate system on said substrate by hydrolysis of the complex alkoxide. The resultant thin film may heated to a temperature ranging from 400 to 900.degree. C. to produce thin films with a perovskite structure.Type: GrantFiled: January 21, 1994Date of Patent: November 30, 1999Assignee: Murata Manufacturing Co., Ltd.Inventor: Yoshio Abe
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Patent number: 5993894Abstract: A conductive layer comprising metal-oxide or metal-oxides is applied to a substrate byproviding a layer comprising a metal-salt or a mixture of metal-salts on the substrate,bringing the layer into contact with an alkaline solution, and, subsequently,subjecting the layer to a thermal treatment (heating).Type: GrantFiled: April 24, 1998Date of Patent: November 30, 1999Assignee: U.S. Philips CorporationInventors: Johannes H. W. G. Den Boer, Claudia Mutter, Sipke Wadman, Henricus X. Willems
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Patent number: 5985430Abstract: This invention relates to amorphous fibers containing Si, B and N, to a process for the production thereof and to the use thereof, and to composites containing these amorphous fibers and the production thereof.Type: GrantFiled: November 3, 1997Date of Patent: November 16, 1999Assignee: Bayer AktiengesellschaftInventors: Hans-Peter Baldus, Gerd Passing, Aloys Eiling
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Patent number: 5980973Abstract: A method of providing biocompatible surface texturing on a metal component of an implantable device and the device so produced. The coating is provided by applying particles of metal falling substantially entirely in the range of 1 to 5 microns to a surface of said component to provide a layer of generally uniform thickness and sintering said particles to one another and to said component to provide a generally continuous external surface having surface texturing in the form of projections formed from said sintered particles. The particles are preferably applied to a depth of 1 to 25 microns. In a preferred embodiment particles of titanium are applied to a surface of a titanium component.Type: GrantFiled: March 13, 1998Date of Patent: November 9, 1999Assignee: Medtronic, Inc.Inventors: Chike O. Onyekaba, George C. Johnstone, David D. Verness
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Patent number: 5981002Abstract: The invention includes a method for densifying one or more porous preforms, including the edges and surfaces of one or more preform, when using a liquid precursor. The method includes covering at least a portion of the porous preform with an insulating material to insulate at least a part of the preform. The preform is submerged in a precursor liquid which is heat-decomposable. The preform is heated in the precursor liquid at a temperature sufficient to decompose the precursor liquid within the preform and to deposit a decomposition product of the precursor liquid within the preform. The heating of the preform is continued in the precursor liquid until at least part of the insulated portion of the preform, which would not densify in this process without insulation, is densified.Type: GrantFiled: February 9, 1998Date of Patent: November 9, 1999Assignee: Textron Systems CorporationInventor: Donald F. Connors, Jr.
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Patent number: 5980983Abstract: A liquid precursor is provided for the formation of metal oxide films comprising a mixture of two ro more types of beta-diketonate ligands bound to one or more metals. For example, a liquid mixture was formed of the mixed aluminum beta-diketonates derived from two or more of the ligands 2,6-dimethyl-3,5-heptanedione; 2,7-dimethyl-3,5-heptanedione; 2,6-dimethyl-3,5-octanedione; 2,2,6-trimethyl-3,5-heptanedione; 2,8-dimethyl-4,6-nonanedione; 2,7-dimethyl-4,6-nonanedione; 2,2,7-trimethyl-3,5-octanedione; and 2,2,6-trimethyl-3,5-octanedione. Films of metal oxides are deposited from vaporized precursor mixtures of metal beta-diketonates and, optionally, oxygen or other sources of oxygen. This process may be used to deposit high-purity, transparent metal oxide films on a substrate. The liquid mixtures may also be used for spray coating, spin coating and sol-gel deposition of materials.Type: GrantFiled: April 17, 1998Date of Patent: November 9, 1999Assignee: The President and Fellows of Harvard UniversityInventor: Roy G. Gordon
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Patent number: 5976618Abstract: A process capable of forming an inorganic film which can be used at a relatively large thickness equivalent to, or greater than, the thickness of an organic SOG, without being subjected to oxidation by O.sub.2 plasma treatment used in a fabrication process of a semiconductor device. Polysilazane is first coated on a base, and the resulting polysilazane film is converted to a silicon dioxide film.Type: GrantFiled: September 29, 1997Date of Patent: November 2, 1999Assignees: Fujitsu Limited, Kyushu Fujitsu Electronics LimitedInventors: Shun-ichi Fukuyama, Daitei Shin, Yuki Komatsu, Hideki Harada
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Patent number: 5968653Abstract: A carbon-graphite/silicon carbide composite article is provided. The composite article includes a carbon-graphite body intimately bonded to a dense silicon carbide body by a transition/bonding region which links the two bodies. The transition/bonding region between the carbon-graphite body and the silicon carbide body typically includes a layer rich in silicon metal and a small silicon carbide/silicon metal/carbon graphite area where some of the carbon-graphite from the carbon-graphite body has been converted to silicon carbide. The carbon-graphite body may also include a variety of impregnants.Type: GrantFiled: January 11, 1996Date of Patent: October 19, 1999Assignee: The Morgan Crucible Company, plcInventors: Steven J. Coppella, Laurence J. Thorwart, Mark E. Pfaff, David A. Erich
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Patent number: 5965199Abstract: A ceramic, metal, or metal alloy surface is covered with lithium permangae which is then thermally decomposed to produce a corrosion resistant coating on the surface. This coating serves as a primer coating which is preferably covered with an overcoat of a sealing paint.Type: GrantFiled: September 29, 1997Date of Patent: October 12, 1999Assignee: The United States of America as represented by the Secretary of the NavyInventor: William A. Ferrando
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Patent number: 5965192Abstract: A phosphor comprises, in atomic percentages, 90% to 100% of a mixed metal oxide MxTyOz, wherein M is a metal selected from Zn, Sn, In, Cu, and combinations thereof, T is a refractory metal selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and combinations thereof, and O is Oxygen, x, y, and z being chosen such that z is at most stoichiometric for MxTyOz; and 0% to 10% of a dopant comprising a substance selected from a rare earth element of the lanthanide series, Mn, Cr, and combinations thereof, or stoichiometrically excess zinc, copper, tin, or indium. Cathodoluminescent phosphor compositions stimulable by electrons of very low energy are prepared from metal oxides treated with refractory metals in various processes disclosed.Type: GrantFiled: July 28, 1997Date of Patent: October 12, 1999Assignee: Advanced Vision Technologies, Inc.Inventor: Michael D. Potter
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Patent number: 5962079Abstract: Ultra thin organo-ceramic and metal oxide films are prepared under room temperature and atmospheric conditions by exposing .alpha., .omega.--functional siloxane oligomers and fatty acid metal soaps, respectively, to a combination of ultraviolet light (UV) and ozone (O.sub.3). The process includes the steps of preparing ultra thin .alpha., .omega.--functional polysiloxane and fatty acid metal soap films using, but not limited to, the Langmuir-Blodgett (LB) technique. The LB technique permits construction of molecular monolayer or multilayer films on a variety of substrates. By using carboxylic acid end groups on the siloxane oligomers, metal ions can be incorporated into the SiO.sub.x film after UV-ozone exposure. This technique can be used to make electronically, optically, and chemically important organo-ceramic and metal oxide films on temperature sensitive substrates.Type: GrantFiled: January 2, 1997Date of Patent: October 5, 1999Assignee: The University of ConnecticutInventors: Jeffrey T. Koberstein, Christopher L. Mirley
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Patent number: 5962069Abstract: A liquid precursor containing a metal is applied to a first electrode, dried in air at a first temperature of 160.degree. C. and then a second temperature of 260.degree. C., RTP baked at a temperature of 300.degree. C. in oxygen, RTP baked at a temperature of 650.degree. C. in nitrogen, and annealed at a temperature of 800.degree. C. in nitrogen to form a strontium bismuth tantalate layered superlattice material. A second electrode is deposited and then the device is patterned to form a capacitor, and a second anneal is performed at a temperature of 800.degree. C. in nitrogen. Alternatively, the second anneal may be performed in oxygen at a temperature of 600.degree. C. or less. In this manner, a high electronic quality thin film of a layered superlattice material is fabricated without a high-temperature oxygen anneal.Type: GrantFiled: July 25, 1997Date of Patent: October 5, 1999Assignees: Symetrix Corporation, Siemens AktiengesellschaftInventors: Gunther Schindler, Walter Hartner, Carlos Mazure, Narayan Solayappan, Vikram Joshi, Gary F. Derbenwick
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Patent number: 5962135Abstract: This invention describes the infiltration methods used to incorporate ceramic additives in carbon/carbon brake disc preforms. Aqueous vacuum infiltration techniques were employed. Both methods were effective in achieving homogeneous dispersion of ceramic additives throughout brake disc thickness. Heat treatment processes were developed to convert oxide additives to more refractory phases. Both temperature and N.sub.2 overpressure were precisely controlled during conversion. By using the additives, infiltration routes, and heat treatment schedules, brake disc friction material performance properties such as friction coefficient, friction coefficient stability, and brake disc wear rate are improved. The disclosed carbon/carbon brake discs can be used in aerospace, automotive and other friction material applications.Type: GrantFiled: October 3, 1997Date of Patent: October 5, 1999Assignee: AlliedSignal Inc.Inventors: Terence Bryan Walker, Richard J. Donaldson, Philip J. Whalen
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Patent number: 5958504Abstract: A process for the production of a hydroxyapatite coated article includes contacting a coating comprising hydroxyapatite with a recrystallization medium, pressurizing the recrystallization medium, heating the coated article under conditions of reduced oxygen activity at a temperature in the range of 100 to 350.degree. C. A process for the production of highly crystalline hydroxyapatite coated articles includes contacting a coating comprising hydroxyapatite with recrystallization medium containing hydroxyapatite particles, pressurizing the recrystallization medium, and heating the immersed coated article under conditions effective to crystallize hydroxyapatite.Type: GrantFiled: December 18, 1996Date of Patent: September 28, 1999Assignee: Etex CorporationInventors: Dusuk Duke Lee, William T. Conner
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Patent number: 5955146Abstract: A process for coating the surface of a single crystal with a magnesium oxide film which comprises contacting an organomagnesium compound having an oxygen to magnesium atomic ratio of 1:1 with the crystal heated to a temperature ranging from 300.degree. C. to 450.degree. C. in the absence of oxygen. The magnesium oxide film thus produced has a negligible amount of residual carbon.Type: GrantFiled: December 18, 1997Date of Patent: September 21, 1999Assignee: Korea Research Institute of Chemical TechnologyInventors: Yunsoo Kim, Wonyong Koh, Sujin Ku
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Patent number: 5955391Abstract: In fiber composite ceramic containing reaction sintered SiC as a matrix and having BN-coated SiC continuous fibers as composite fibers, the thickness of the BN coating need not be especially made large, and a sliding effect during growing of cracks can be improved, i.e., breakdown energy can be increased. A method of manufacturing fiber composite ceramic in which large number of BN-coated SiC fibers covered with a BN coating are gathered to form yarns, or yarns are woven to form a two-dimensional or three-dimensional fabric, and a preform is formed by the yarns or the fabric, C powder is arranged in a gap portion between fibers of the preform to form a compact, a molten Si is impregnated into the compact to form an SiC matrix between fibers. A region having a high B concentration is formed around the SiC fibers before the preform is impregnated with the molten Si, and B in the region is solid-solved in Si during reaction sintering to suppress B in the BN-coated SiC fibers from being solid-solved in Si.Type: GrantFiled: March 28, 1997Date of Patent: September 21, 1999Assignee: Kabushiki Kaisha ToshibaInventors: Tsuneji Kameda, Shoko Suyama, Akio Sayano, Masahiro Asayama, Yoshinori Hayakawa
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Patent number: 5952769Abstract: The present process for the production of sparkplugs provides coated sparkplugs that are resistant to carbonization or lead fouling of the central ceramic insulator. A liquid metal carboxylate composition is applied to the insulator of the sparkplug and subjected to heat treatment at a temperature preferably above 400.degree. C. to form a durable metal oxide layer on the insulator.Type: GrantFiled: March 29, 1996Date of Patent: September 14, 1999Assignee: Sparco, Inc.Inventor: Leonid Viktorovich Budaragin
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Patent number: RE36573Abstract: A method for producing thick ceramic films of greater than 10 .mu.m on selected substrates is described. Conventional sol gel solutions are loaded with up to about 90% by weight of finely divided ceramic particles and mixed. The resulting slurry or paint can be either spun or dip coated or sprayed or painted onto a planar or other substrate, fired to remove the organic materials and to develop a microcrystalline structure. The fired film may then be heated. Composite films are also contemplated.Type: GrantFiled: September 26, 1997Date of Patent: February 15, 2000Assignee: Queen's University at KingstonInventors: David A. Barrow, T. Edward Petroff, Michael Sayer