Alkaline Earth Metal Compound Containing Patents (Class 501/123)
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Publication number: 20030049329Abstract: The present invention provides a novel process for producing a calcium phosphate cement or filler which hardens in a temperature dependent fashion in association with an endothermic reaction. In the reaction a limited amount of water is mixed with dry calcium phosphate precursors to produce a hydrated precursor paste. Hardening of the paste occurs rapidly at body temperature and is accompanied by the conversion of one or more of the reactants to poorly crystalline apatitic calcium phosphate. The hardened cements, fillers, growth matrices, orthopedic and delivery devices of the invention are rapidly resorbable and stimulate hard tissue growth and healing. A composite material is provided including a strongly bioresorbable, poorly crystalline apatitic calcium phosphate composite and a supplementary material. The supplementary material is in intimate contact with the hydroxyapatite material in an amount effective to impart a selected characteristic to the composite.Type: ApplicationFiled: November 23, 2001Publication date: March 13, 2003Inventors: Dosuk D. Lee, Christian Rey, Maria Aiolova, Aliassghar Tofighi
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Patent number: 6517693Abstract: The invention presents an ion conductor with high reliability, that is one of the following perovskite oxides: {circle around (1)} perovskite oxide of the composition BaZr1-xCexO3-p (0<x<0.8); {circle around (2)} perovskite oxide consisting essentially of Ba, Zr, Ce and O, and substantially conducting protons only; {circle around (3)} perovskite oxide of the composition BaZr1-x-yCexMyO3-p (M, O≦x<1,0<y<1, x+y<1) that is a single-phase polycrystal of cubic, tetragonal or orthorhombic crystal structure whose unit cell edges a, b and c (with a≧b≧c) satisfy 0.8386 nm<a<0.8916 nm and b/a≧0.90; {circle around (4)} perovskite oxide of the same composition as in {circle around (3)} that is a single-phase sintered product with a density of at least 96% of the theoretical density; and {circle around (5)} perovskite oxide of the same composition as in {circle around (3)} that is a single-phase sintered product with 1 to 30 &mgr;m granular diameter.Type: GrantFiled: February 7, 2001Date of Patent: February 11, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Noboru Taniguchi
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Publication number: 20030027027Abstract: The present invention relates to compositions of matter represented by the general formulaType: ApplicationFiled: April 27, 2001Publication date: February 6, 2003Inventors: Raymond Ashton Cutler, Robin Edward Richards
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Patent number: 6512879Abstract: Phosphate free, Er/Yb co-doped borosilicate glass compositions and optical devices made from said compositions are disclosed; said compositions comprising, for 100 parts by weight of: 60 to 70 parts by weight SiO2 or SiO2+GeO2 with SiO2 always being greater than 40 parts by weight, 8 to 12 parts by weight of B2O3, 10 to 25 parts by weight M2O wherein M2O is an alkali metal oxide, 0 to 3 parts by weight of BaO, 0.1 to 5 parts by weight Er2O3, and from 0.1 to 12 parts by weight of Yb2O3 and from 0 to less than 5 parts by weight F; and within which, the boron atoms are of tetrahedral spatial coordination.Type: GrantFiled: November 3, 2000Date of Patent: January 28, 2003Assignee: Corning IncorporatedInventors: Alain Beguin, Patrice Camy, Pascale LaBorde, Christian Lerminiaux
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Publication number: 20030013596Abstract: Grain oriented ceramics constituted of a polycrystalline body of a layered cobaltite in which a {001}plane of each grain constituting the polycrystalline body has an average orientation degree of 50% or more by the Lotgering's method. In this case, the layered cobaltite is preferably a layered calcium cobaltite expressed by the following general formula: {(Ca1−xAx)2CoO3+&agr;} (CoO2+&bgr;)y (where A represents one or more elements selected among an alkali metal, an alkaline earth metal and Bi, 0 ≦×≦0.3, 0.5 ≦y ≦2.0, and 0.85 ≦{3+&agr;+(2+&bgr;)y}/(3+2y) ≦1.15). Such grain oriented ceramics are obtained by molding a mixture of the first powder constituted of a Co(OH)2 platelike powder and the second powder constituted of CaCO3 and the like such that a developed plane of the platelike powder is oriented, and by heating the green body at a predetermined temperature.Type: ApplicationFiled: April 26, 2002Publication date: January 16, 2003Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Hiroshi Itahara, Shin Tajima, Toshihiko Tani, Kunihito Koumoto
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Publication number: 20020158373Abstract: A method of making a cristobalite-free, mullite grain capable of withstanding reaction with molten aluminum, comprising the steps of: producing a clay slurry comprised of water and kaolin clay of a specific particle size; mixing a water insoluble barium or strontium containing compound into the clay slurry in an amount wherein the barium or strontium containing compound content of the slurry is equal to about 8% by weight of the kaolin clay in the slurry; removing sufficient water from the slurry to form a material having an pelletizable consistency; forming the material into pellets; heating the pellets by continuously moving them through a furnace having a zone, wherein the material is exposed to temperatures of at least 2,650° F. (1,455° C.) for at least 30 minutes.Type: ApplicationFiled: April 15, 2002Publication date: October 31, 2002Applicant: North American Refractories Co.Inventors: H. David Prior, Daniel F. Fura
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Patent number: 6458732Abstract: A dry refractory composition having superior insulating value. The dry refractory composition also may have excellent resistance to molten metals and slags. The composition includes filler lightweight material, which may be selected from perlite, vermiculite, expanded shale, expanded fireclay, expanded alumina silica hollow spheres, bubble alumina, sintered porous alumina, alumina spinel insulating aggregate, calcium alumina insulating aggregate, expanded mulllite, cordierite, and anorthite, and matrix material, which may be selected from calcined alumina, fused alumina, sintered magnesia, fused magnesia, silica fume, fused silica, silicon carbide, boron carbide, titanium diboride, zirconium boride, boron nitride, aluminum nitride, silicon nitride, Sialon, titanium oxide, barium sulfate, zircon, a sillimanite group mineral, pyrophyllite, fireclay, carbon, and calcium fluoride.Type: GrantFiled: June 7, 1999Date of Patent: October 1, 2002Assignee: Allied Mineral Products, Inc.Inventors: Douglas K. Doza, John Y. Liu
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Publication number: 20020114938Abstract: A porous sintered body of a calcium phosphate-based ceramic having a porosity of 80% or more. The porous sintered body is produced by a method comprising the steps of: (1) preparing a slurry comprising a calcium phosphate-based ceramic powder, a water-soluble high molecular compound and a nonionic surface active agent; (2) stirring the slurry vigorously to froth the slurry; (3) solidifying the frothed slurry into a gel; and (4) drying and sintering the gel.Type: ApplicationFiled: December 7, 2001Publication date: August 22, 2002Applicant: ASAHI KOGAKU KOGYO KABUSHIKI KAISHAInventor: Toshio Matsumoto
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Patent number: 6436861Abstract: The present invention relates to porous calcium zirconate/magnesia composites having a thermally and chemically stable porous structure, which consist of sintered compacts having a fine composite structure stable under high temperatures due to uniformly dispersed equimolar amounts of calcium zirconate [CazrO3] and magnesia [MgO] and controlled grain growth, and a method of producing the same, and the present porous composites are useful as, for instance, a functional material for filtering highly corrosion resistant materials, lightening members used at super-high temperatures, catalyst carriers, insulation or sound-absorbing materials, and the like.Type: GrantFiled: October 25, 2000Date of Patent: August 20, 2002Assignee: National Institute of Advanced Industrial Science and TechnologyInventors: Yoshikazu Suzuki, Tatsuki Ohji, Peter E. D. Morgan
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Publication number: 20020094930Abstract: Disclosed are a new silica refractory brick, a method for making the same and a glass manufacturing furnace comprising the same. Said brick is made from quartz grains, contains calcium oxide binder, consists essentially of (i) silica and (ii) less than 1 weight percent of calcium oxide binder, and when subject to ASTM C-987 alkali vapor test at 1370° C. for 24 hours, has an erosion depth of less than 4 mm and a penetrated depth of less than 3 mm. The brick has reduced level of calcium oxide binder and improved resistance to alkalis and is particularly useful in oxygen-fuel fired glass furnaces.Type: ApplicationFiled: August 15, 2001Publication date: July 18, 2002Inventors: John T. Brown, John F. Wosinski, Jean A. Wosinski
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Patent number: 6398977Abstract: The present invention provides a hollow shape strontium iron oxide particle powder. Not only is the particle powder high in safety and excellent in workability, but exhibits a large dielectric constant when formed into an artificial dielectric material utilizing electrical conduction by being dispersed in an organic medium such as a rubber.Type: GrantFiled: April 11, 2000Date of Patent: June 4, 2002Assignee: Toda Kogyo CorporationInventors: Tatsuya Nakamura, Yoji Okano, Akihisa Kajiyama
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Publication number: 20020045531Abstract: A method of manufacturing oriented sintered ceramic product which enables to manufacture an oriented sintered product with an average crystal grain size of 20 &mgr;m or less and a grain width 0.4 times or less of the grain size, or an oriented sintered product with an average crystal grain size of 20 &mgr;m or more and a grain width 0.5 times or more of the grain size with no grain growth of plate-like seed crystals, the method comprising dispersing a non-ferromagnetic powder having a not-cubic crystal structure into a slurry, consolidating the slurry under a magnetic field and sintering the molding product.Type: ApplicationFiled: May 15, 2001Publication date: April 18, 2002Inventors: Toru Suzuki, Yoshio Sakka
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Patent number: 6365535Abstract: A ceramic composition having a high adsorptive capacity for oxygen at elevated temperature, including at least one of: Bi2−yEryO3−d; Bi2−yYyO3−d; La1−yBayCo1−xNixO3−d; La1−ySryCo1−xNixO3−d; La1−yCayCo1−xNixO3−d; La1−yBayCo1−xFexO3−d; La1−ySryCo1−xFexO3−d; and La1−yCayCo1−xFexO3−d; wherein x is from 0.2 to 0.8, y is from 0 to 1.0 and d=0.1 to 0.9. Such ceramic composition may be made using a modified Pechini synthetic procedure. The resulting ceramic composition is usefully employed as an adsorbent for separation of oxygen from an oxygen-containing feed gas mixture, e.g., in a pressure swing adsorption (PSA) process.Type: GrantFiled: November 2, 1999Date of Patent: April 2, 2002Assignee: Advanced Technology Materials, Inc.Inventors: Ward C. Stevens, Delwyn Cummings, Philip Chen
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Patent number: 6352790Abstract: A barrier layer for a silicon containing substrate comprises an alkaline earth aluminosilcate and an additive component capable of forming a reaction product with silica.Type: GrantFiled: June 29, 2000Date of Patent: March 5, 2002Assignee: United Technologies CorporationInventors: Harry E. Eaton, Stephen Chin, John J. Brennan
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Publication number: 20020025901Abstract: A method for producing a barium-containing composite metal oxide, comprising calcining a mixture of a barium compound and a metal compound comprising at least one metal selected from the group consisting of magnesium, aluminum, europium, manganese, strontium, calcium, terbium, zinc and titanium, or calcining a barium-containing composite metal salt comprising barium and at least one metal selected from the group consisting of magnesium, aluminum, europium, manganese, strontium, calcium, terbium, zinc and titanium, in a gas comprising a hydrogen halide and water vapor.Type: ApplicationFiled: July 26, 2001Publication date: February 28, 2002Applicant: SUMITOMO CHEMICAL CO., LTD.Inventors: Keiji Ono, Susumu Miyazaki
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Publication number: 20020010072Abstract: A method of producing an electronic device comprising a dielectric layer includes a dielectric ceramic composition containing a main component expressed by a composition formula of {(Sr1−xCax)O}m.(Ti1−yZry)O2, wherein the code x in said composition formula fulfills 0≦x≦1.00 and the code y in said composition formula fulfills 0≦y≦0.20, and characterized by producing said dielectric ceramic composition by using a material expressed by a composition formula of {(Sr1−xCax)O}m′.(Ti1−yZry)O2 wherein the mole ratio m′ in said composition formula fulfills m′<m. Due to the method, it is possible to produce an electronic device, such as a chip capacitor, having excellent resistance to reducing during firing and excellent capacity-temperature characteristics after firing, wherein the insulation resistance is hard to be deteriorated particularly when made to be a thin layer and defect rate of the initial insulation resistance is low.Type: ApplicationFiled: March 19, 2001Publication date: January 24, 2002Applicant: TDK CORPORATIONInventors: Takashi Fukui, Yasuo Watanabe, Mikio Takahashi, Akira Sato
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Patent number: 6340648Abstract: A calcium phosphate porous sintered body which comprises spherical pores communicating with one another substantially throughout the body with a porosity of 55% or more and 90% or less, and has an average diameter of the inter-pore communicating parts of 50 &mgr;m or more, a pore diameter of 150 &mgr;m or more, and a three-point bending strength of 5 MPa or more, and a method for producing the same.Type: GrantFiled: April 13, 2000Date of Patent: January 22, 2002Assignees: Toshiba Ceramics Co., Ltd., National Institute for Research in Inorganic Materials-Science and Technology Agency, Toshiba Denko Co., Ltd.Inventors: Kohichi Imura, Hideo Uemoto, Akimichi Hojo, Junzo Tanaka, Masanori Kikuchi, Yasushi Suetsugu, Hiraku Yamazaki, Masami Kinoshita, Nobuaki Minowa
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Patent number: 6322622Abstract: A flame spray mending material effective for applying a dense thermal spray mending layer to a silica brick wall of an industrial furnace, having a high crystallization ratio immediately after thermal spraying in a broad thermal spray condition, having an oxide concentration of 89% by weight or more of SiO2, more than 2.0 to 4.0% by weight of Na2O and/or more than 0.2 to 4.0% by weight of Li2O, having a 80% or more crystallization ratio after thermal spraying and 200 kgf/cm2 or more compression strength. A slight amount of CaO may be present to make a flame spray mending material with an oxide concentration of 89% by weight or more of SiO2, more than 2.0 to 5.0% by weight of CaO, 0.5 to 4.0% by weight of Na2O and/or more than 0.2 to 4.0% by weight of Li2O, and 1.0% by weight of less of Al2O3.Type: GrantFiled: November 26, 1999Date of Patent: November 27, 2001Assignee: Kawasaki Steel CorporationInventors: Hisahiro Matsunaga, Masato Kumagai, Yasumasa Fukushima
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Patent number: 6323146Abstract: The present invention is directed to a synthetic biomaterial compound based on stabilized calcium phosphates and more particularly to the molecular, structural and physical characterization of this compound. The compound comprises calcium, oxygen and phosphorous, wherein at least one of the elements is substituted with an element having an ionic radius of approximately 0.1 to 1.1 Å. The knowledge of the specific molecular and chemical properties of the compound allows for the development of several uses of the compound in various bone-related clinical conditions.Type: GrantFiled: March 19, 1998Date of Patent: November 27, 2001Assignee: Millenium Biologix, Inc.Inventors: Sydney M. Pugh, Timothy J. N. Smith, Michael Sayer, Sarah Dorthea Langstaff
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Patent number: 6313057Abstract: A fused silica refractory material made from quartz grains and a method of making the material which contains calcium oxide binder in an amount less than one weight percent. The reduction in calcium oxide binder prevents the degradation of fused silica refractory bricks in furnace environments containing alkali vapors, such as in oxygen-fuel fired glass furnaces. The invention also includes a method of preventing the degradation of silica refractory material by alkalis.Type: GrantFiled: October 8, 1999Date of Patent: November 6, 2001Assignee: Corning IncorporatedInventors: John Thomas Brown, John F. Wosinski
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Publication number: 20010017152Abstract: This invention provides a complex oxide comprising the features of: (i) being represented by the formula: Ca3-xRExCo4Oy wherein RE is a rare earth element, 0≦x≦0.5 and 8.5≦y≦10, (ii) having a Seebeck coefficient of 100 &mgr;V/K or more at a temperature of 300° C. or higher, and (iii) having an electric conductivity of 103 S/m or more at a temperature of 300° C. or higher. The complex oxide is composed of low-toxicity elements, excellent in heat resistance and chemical durability and high in thermoelectric conversion efficiency.Type: ApplicationFiled: December 8, 2000Publication date: August 30, 2001Inventors: Ryoji Funahashi, Ichiro Matsubara, Satoshi Sodeoka
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Publication number: 20010007381Abstract: The invention relates to a process for production of a sintered oxide ceramic of composition CexMyDzO2-a with dense structure without open porosity or with a predetermined porosity. The first doping element M is at least one element of the group consisting of the rare earths but M≢Ce, alkali and earth alkali metals. The educts are used with a second doping element D of at least one metal of the group consisting of Cu, Co, Fe, Ni and Mn, in the submicron particle size or as a salt solution, and sintered at a temperature in the range of 750-1250° C. into an oxide ceramic with extremely fine structure of a grain size of maximum around 0.5 &mgr;m.Type: ApplicationFiled: January 17, 2001Publication date: July 12, 2001Inventors: Christoph Kleinlogel, Martin Goedickemeier, Ludwig Gauckler
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Patent number: 6218335Abstract: A porous spinel type oxide shows a large surface area and a uniform micro-porous structure. The oxide is expressed by general formula MO—Al2O3 and shows a surface area per unit weight of not less than 80 m2/g. Such a porous spinel type compound oxide is obtained by impregnating a specific &ggr;-alumina carrier with a solution of a compound of metal element M capable of taking a valence of 2, drying the impregnated carrier and calcining it at a temperature of 600° C. or higher. The specific &ggr;-alumina carrier shows a surface area per unit weight of not less than 150 m2/g, a micro-pore volume per unit weight of not less than 0.55 cm3/g and an average micro-pore diameter between 90 and 200 angstroms. The micro-pores with a diameter between 90 and 200 angstroms occupy not less than 60% of the total micro-pore volume of the carrier.Type: GrantFiled: July 23, 1999Date of Patent: April 17, 2001Assignee: Chiyoda CorporationInventors: Yoshimi Okada, Kenichi Imagawa, Susumu Yamamoto
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Patent number: 6194083Abstract: A ceramic composite material comprises a ceramic material constituting a matrix, and dispersion particles disposed in the matrix in a dispersing manner. A specific shape of a ceramic composite material is, for instance, a sinter or a thermally sprayed layer. The dispersion particles are consisting of a composite oxide including at least one kind of a first metallic element selected from alkaline earth metals such as Mg and Ca, and at least one kind of a second metallic element selected from W, Ti, Ta, Mo, Nb, V, B, Te, Ge and Si, for instance, are composite oxide particles precipitated by reacting a compound containing a first metallic element and a compound including a second metallic element through heat treatment. The precipitated particles consisting of such a composite oxide can be dispersed as planar particles or acicular particles in the ceramic layer to which, for instance, thermal spraying is applied.Type: GrantFiled: July 27, 1998Date of Patent: February 27, 2001Assignee: Kabushiki Kaisha ToshibaInventors: Kazuhiro Yasuda, Seiichi Suenaga, Kunihiko Wada, Hiroki Inagaki, Yasuhiro Goto
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Patent number: 6190448Abstract: A refractory composition is disclosed comprising a high purity silicon dioxide and a binder. This refractory composition may be applied by trowelling, brushing, casting, pumping and/or spraying it on a worn and/or damaged high purity silica refractory surface. A refractory castable composition is also disclosed that may be employed with forms. Further, an essentially non-slumping, sprayable refractory castable composition that is applied without the use of forms is provided. The sprayable refractory castable composition comprises (a) a tempered, pumpable first component comprising (i) a high purity silicon dioxide and a binder, and (ii) water, if needed, to achieve a pumpable consistency, and (b) a second component comprising a flocculating agent. The flocculating agent is added to the first component for achieving installation of the sprayable refractory composition in an amount to prevent slumping of the sprayable refractory castable composition.Type: GrantFiled: February 9, 1999Date of Patent: February 20, 2001Assignee: Harbison-Walker Refractories CompanyInventor: Mark C. Langenohl
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Patent number: 6187157Abstract: A multi-phase solid electrolyte ion transport membrane comprising at least two phases wherein one of the phases comprises an oxygen ion single conductive material, or a mixed conductor. The other phase comprises an electronically-conductive metal or metal oxide that is incorporated into the membrane by deposition of the metal or metal oxide from a polymer made by polymerizing a chelated metal dispersion in a polymerizable organic monomer or prepolymer. The multi-phase composition advantageously comprises a first phase of a ceramic material and a second phase of a metal or metal oxide bound to a surface of the ceramic material. The multi-phase composition is advantageously prepared in an in-situ fashion before fabricating the membrane matrix. As another alternative, a preformed ceramic matrix is surface-coated with a metal or metal oxide.Type: GrantFiled: February 2, 1999Date of Patent: February 13, 2001Assignee: Praxair Technology, Inc.Inventors: Chieh-Cheng Chen, Ravi Prasad
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Patent number: 6174463Abstract: A layer crystal structure oxide, and memory element comprising same, comprising bismuth (Bi), a first element, a second element and oxygen (O), wherein the first element is at least one selected from the group consisting of sodium (Na), potassium (K), calcium (Ca), barium (Ba), strontium (Sr), lead (Pb), and bismuth (Bi), the second element is at least one selected from the group consisting of iron (Fe), titanium (Ti), niobium (Nb), tantalum (Ta), and tungsten (W), and the composition ratio of the bismuth with respect to the second element is larger than the stoichiometric composition ratio, wherein, the composition ratio of the bismuth with respect to the first element is in the range of (2±0.17)/(m−1) including the stoichiometric composition ratio 2/(m−1), where m is an integer from, and including, 2 to 5.Type: GrantFiled: March 26, 1998Date of Patent: January 16, 2001Assignee: Sony CorporationInventors: Akio Machida, Naomi Nagasawa, Takaaki Ami, Masayuki Suzuki
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Patent number: 6174832Abstract: A ceramic compound which undergoes martensitic transformation comprises a compound represented by compositional formula Ln1-xSixAlO3+0.5x obtained by substituting a part of LnO1.5 in LnAlO3-type compounds with SiO2, where Ln represents at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb, and x=0.01 to 0.3.Type: GrantFiled: September 28, 1998Date of Patent: January 16, 2001Assignees: Seiko Instruments Inc.Inventors: Mamoru Oomori, Toshio Harai
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Patent number: 6143679Abstract: Provided are a layered crystal structure oxide showing ferroelectricity or paraelectricity and a process for easily producing the same. A raw material containing Bi.sub.2 O.sub.3 as a flux is heated up to 1330.degree. C. or higher and 1450.degree. C. or lower at a suitable temperature-elevating rate (heating step); the raw material is maintained at this heating temperature for prescribed time (constant temperature step); and then, it is slowly cooled down to 800.degree. C. or higher and 1300.degree. C. or lower at a rate of 1.degree. C./hour or more and 20.degree. C./hour or less (slow cooling step). This makes it possible to evaporate the flux and take out directly Bi.sub.2 SrTa.sub.2 O.sub.9. In this Bi.sub.2 SrTa.sub.2 O.sub.9, Bi is partially substituted with Sr, and oxygen is selectively deficient or disordered. Or, Bi and O in the fluorite layer are relatively displaced each other in the polarization direction.Type: GrantFiled: October 3, 1997Date of Patent: November 7, 2000Assignee: Sony CorporationInventors: Naomi Nagasawa, Akio Machida, Takaaki Ami, Masayuki Suzuki
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Patent number: 6127296Abstract: Disclosed is a novel ceramic-glass composite material useful as a material of electronic parts for attenuation of noise components in the GHz range. The composite material is a sintered body obtained by a heat treatment of a powder blend consisting of 35-55% by weight of a hexagonal ferrite of the formula Ba.sub.3 M.sub.2 Fe.sub.24 O.sub.41 (M.dbd.Co, Ni and/or Zn) and the balance of a glass material consisting of SiO.sub.2, Al.sub.2 O.sub.3, SrO, CaO, MgO and B.sub.2 O.sub.3, of which the content of SrO is 15-25% by moles, at a relatively low sintering temperature of 850-920 .degree. C. for 10-30 minutes.Type: GrantFiled: April 16, 1999Date of Patent: October 3, 2000Assignee: TDK CorporationInventor: Fumio Uchikoba
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Patent number: 6117808Abstract: An improved highly oxygen permeable substrate is provided comprising Sr--Fe--Co-oxide and a metal combined with said material. Also provided is a method for producing an improved membrane to facilitate oxidation of compounds comprising combining metal or metal alloys with Sr--Fe--Co-oxide to create a mixture, and sintering the mixture so as to allow the metal to melt within the mixture. The membrane is also utilized in a method for converting methane to syngas whereby a fluid containing oxygen is contacted to a first surface of the membrane for a sufficient period of time so as to cause some of the oxygen to be transported to a second surface of the membrane; and contacting methane to the second surface for a sufficient period of time to cause oxidation of the methane.Type: GrantFiled: January 21, 1998Date of Patent: September 12, 2000Assignee: The University of ChicagoInventors: P. Subraya Maiya, John J. Picciolo, Joseph T. Dusek
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Patent number: 6110851Abstract: A method of producing a ceramic material based on calcium phosphate compounds for use in dental medicine by adding a phosphate solution to a calcium salt solution, separating the precipitation formed in the reaction solution from the mother liquor, drying, crushing and sintering is characterised in that at least one orthophosphate and at least one diphosphate, each in solution, are added to the calcium salt solution, wherein the molar ratio of diphosphate to orthophosphate is in the region of 0.001 to 0.03:1, and keeps the pH-value of the reaction solution in which the precipitation is formed in the region of 7.5 to 12 until the end of the reaction.Type: GrantFiled: December 7, 1998Date of Patent: August 29, 2000Inventor: Wolfgang Wiedemann
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Patent number: 6093366Abstract: The present invention provides a ceramic sintered body excellent in oxidation resistance under high temperatures and markedly superior to the conventional ceramic sintered body in the mechanical strength over a wide temperature range of between room temperature and 1,500.degree. C. The ceramic sintered body of the present invention comprises at least one ceramic crystal grain selected from the group consisting essentially of a monosilicate represented by the general formula RE.sub.2 SiO.sub.5, where RE denotes a IIIa group element including yttrium, and a disilicate represented by the general formula RE.sub.2 Si.sub.2 O.sub.7, where RE denotes a IIIa group element including yttrium, and at least one additional element selected from the group consisting of Al, Cr, Hf, Nb, Zr, Ti, V, Ta, Ca and Mg which is segregated in the boundaries of the ceramic crystal grains in an amount of 0.1 to 15% by weight of the sintered body in terms of the oxide thereof.Type: GrantFiled: November 5, 1998Date of Patent: July 25, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Masahiro Kato, Yasuhiro Goto, Takayuki Fukasawa, Toshiaki Mizutani
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Patent number: 6090732Abstract: A tricalcium-phosphate-based prosthetic material is disclosed, which is a sintered ceramic body mainly consisting of tricalcium phosphate containing a limited amount of zinc, which is a known element having an osteogenesis-promoting effect, in the form of a solid solution. By virtue of the limited content of zinc and the form of solid solution in which zinc is contained, the inventive material exhibits an osteogenesis-promoting effect without toxicity. The ceramic body is prepared, preferably, by a process in which a tricalcium phosphate powder containing 0.015-8.00% by weight of zinc is diluted by the addition of hydroxyapatite and/or tricalcium phosphate free from zinc in such a proportion as to give a (Ca+Zn)/P molar ratio of 1.55 to 1.65 and the powder blend is shaped and subjected to sintering.Type: GrantFiled: November 25, 1998Date of Patent: July 18, 2000Assignees: Japan as Represented by Director General of Agency of Industrial Science and Technology, Atsuo ItoInventors: Atsuo Ito, Noboru Ichinose, Kenji Ojima, Pierre Layrolle, Haruo Kawamura
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Patent number: 6090500Abstract: An oxide ion mixed conductive substance has the formula of A.sub.1-x Ca.sub.x Ga.sub.1-y B.sub.y oxide, wherein A is at least one lanthanoid element having a trivalent octacoordinated ion radius of 1.05 to 1.15 .ANG., B is at least one element selected from the group consisting of Co, Fe, Ni and Cu, x is 0.05 to 0.3, y is 0.05 to 0.3. The oxide ion mixed conductive substance has the perovskite structure.Type: GrantFiled: August 31, 1998Date of Patent: July 18, 2000Assignees: Mitsubishi Materials Corporation, Tatsumi Ishihara, Yusaka TakitaInventors: Tatsumi Ishihara, Yusaku Takita
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Patent number: 6040275Abstract: A novel ceramic substrate useful for the preparation of superconducting films, said substrate having the formula REBa.sub.2 MO.sub.6 where RE represents rare earth metals--Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and M represents metals Nb, Sb, Sn, Hf, Zr; and a process for the preparation of superconducting YBa.sub.2 Cu.sub.3 O.sub.7-.delta. thick films on new ceramic substrate.Type: GrantFiled: August 3, 1998Date of Patent: March 21, 2000Assignee: Council of Scientific & Industrial ResearchInventors: Jacob Koshy, Jijimon Kumpukkattu Thomas, Jose Kurian, Yogendra Prasad Yadava, Alathoor Damodaran Damodaran
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Patent number: 6039865Abstract: Phosphates can be removed from a hydrocarbon stream by contacting said stream with a ceramic formed of a basic material which is insoluble in the hydrocarbon stream. A ceramic as used in this patent document is a solid solution formed by calcination of a compound. The removal of the organic acid is accomplished at temperatures ranging from 20.degree. C. to 400.degree. C., a preferred temperature is between 200.degree. C. and 370.degree. C. A hydrocarbon stream consists of C.sub.5 + hydrocarbons. The basic material can be made up of one or more alkaline earth oxides, alkaline earth compounds, alkaline metal compounds, group IIIA element compounds, group IVA element compounds, group VIA element compounds. Preferred alkaline earth oxides are sodium, magnesium, potassium, calcium, aluminum and silicon. The support for the basic material can be made from any inorganic oxide.Type: GrantFiled: November 13, 1998Date of Patent: March 21, 2000Assignee: Trisol Inc.Inventor: Shaun T. E. Mesher
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Patent number: 6017839Abstract: The present invention is ceramic article of stabilized zirconia wherein the stabilized zirconia has a molar ratio of rare earth oxide:zirconia of from 1:99 to 15:85, at a weight percent of from about 97 to 75. The ceramic article includes smectite clay from about 3 to 25 weight percent wherein the article is a mass of sintered particles having a continuous tetragonal phase having dispersed therein monoclinic phase particles having size of less than 100 nm.Type: GrantFiled: February 9, 1998Date of Patent: January 25, 2000Assignee: Eastman Kodak CompanyInventors: Debasis Majumdar, Dilip K. Chatterjee, Syamal K. Ghosh
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Patent number: 5998523Abstract: Disclosed is a composition of an essentially solid phase state having as components, a liquid hydrophilic organic polymer, an aqueous salt solution containing at least one metallic or metalloid element, and a coagulating agent. The composition on calcination provides a metal-containing powder having an average particle size of 1 micrometer or less. Such metal-containing powders are of value in the preparation of industrial catalysts, ceramics, electronic components, or as fillers in plastics, paints or cosmetics.Type: GrantFiled: July 18, 1997Date of Patent: December 7, 1999Assignee: The Dow Chemical CompanyInventors: Henri J. M. Grunbauer, Jacobus A. Broos, Frederik R. van Buren
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Patent number: 5981415Abstract: A ceramic composite material consisting of two or more crystal phases of different components, each crystal phase having a non-regular shape, said crystal phases having three dimensional continuous structures intertwined with each other, at least one crystal phase thereof being a single crystal. Further, by removing at least one crystal phase from this ceramic composite material, there is provided a porous ceramic material consisting of at least one crystal phase and pores, said crystal phase and pores having non-regular shapes and being three dimensionally continuous and intertwined with each other.Type: GrantFiled: June 30, 1997Date of Patent: November 9, 1999Assignee: UBE Industries, Ltd.Inventors: Yoshiharu Waku, Narihito Nakagawa, Kazutoshi Shimizu, Hideki Ohtsubo, Takumi Wakamoto, Yasuhiko Kohtoku
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Patent number: 5955387Abstract: A ceramic composite is provided comprising ceramic fibers, glass microballoons and/or diatoms, bound together with a ceramic reinforcing cloth with a sol-gel ceramic binder. The composite is particularly useful as a high strength, high temperature insulation material.Type: GrantFiled: June 23, 1997Date of Patent: September 21, 1999Assignee: The Boeing CompanyInventor: Darryl F. Garrigus
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Patent number: 5942453Abstract: A powdered mixture of chemicals for forming a refractory composition, including a filler consisting of refractory particles, metal particles and metal peroxide containing particles, wherein the metal peroxide containing particles have a calcium peroxide content of at most 75 wt %, a magnesium peroxide content of at most 30 wt %, a barium peroxide content of at most 92 wt %, and/or a strontium peroxide content of at most 90 wt %. A refractory composition prepared from said mixture, a method for forming said composition and a method for using same are also disclosed.Type: GrantFiled: September 10, 1996Date of Patent: August 24, 1999Assignee: FIB-ServicesInventor: Oswaldo Di Loreto
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Patent number: 5880046Abstract: This moldable refractory composition is intended to be used in the production of cast refractory pieces resistant to molten metals, especially molten aluminum. It comprises 8 to 25% by weight of an aqueous phosphoric acid solution having a concentration of phosphoric acid ranging from 40 to 85% by weight, with up to 50% of the primary acidic function of the acid phosphoric acid neutralized by reaction with vermiculite. It also comprises from 75 to 92% by weight of a mixture containing wollastonite and an aqueous suspension containing from 20 to 40% by weight of colloidal silica. The weight ratio of the aqueous suspension to the wollastonite within the mixture ranges from 0.5 to 1.2. The composition according to the invention is particularly interesting in that it can be unmolded within a very short period of time that is less than 2 hours and can be as small as 10 minutes.Type: GrantFiled: January 23, 1998Date of Patent: March 9, 1999Assignee: Cerminco Inc.Inventors: Pierre Delvaux, Luc Desrosiers, Marcel Gouin, Louis Campagna
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Patent number: 5880048Abstract: A ceramic and method of producing the same are disclosed, the ceramic having as principal ingredients natural zeolite and shells, wherein silver nitrate, magnesium oxide, potassium oxide, sodium oxide selenium oxide and ferric oxide are added thereto, and the resultant mixture fired to produce a granular ceramic. The granular ceramic enables the production of deoxidized water having an appropriately low oxidation reduction potential, for use as drinking water and the like.Type: GrantFiled: September 22, 1997Date of Patent: March 9, 1999Assignee: Tohoku Bankin Toso Kogyo Kabushiki KaishaInventors: Kazuo Sato, Kazutomo Kikuchi
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Patent number: 5880047Abstract: A granular ceramic is prepared by firing a powder of a natural zeolite mineral, a pre-fired powder composed of shell fragments, a pre-fired powder of a silica-alumina mineral, and a copper oxide powder. When used as a fuel additive, the ceramic makes it possible to improve the combustion efficiency of hydrocarbon oils, especially of petroleum products such as gasoline, gas oil kerosene, and heavy oil, as well as to reduce CO.sub.2 and NO.sub.x emissions in exhaust gases discharged during combustion.Type: GrantFiled: August 13, 1997Date of Patent: March 9, 1999Assignee: Tohoku Bankin Toso Kogyo Kabushiki KaishaInventor: Kazuo Sato
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Patent number: 5854157Abstract: An object of the present invention is to provide a novel ceramic composite that has not only excellent dynamic characteristics, but also good electromagnetic characteristics, typified by dielectric characteristics, and the present invention relates to a ceramic composite, characterized in that an oxide having a perovskite structure which includes as raw materials lead and/or an alkaline earth metal is dispersed in a ceramic matrix, and in the above-mentioned ceramic composite, preferably the ceramic matrix is MgO, MgAl.sub.2 O.sub.4, or ZrO.sub.2, and also, preferably in the above-mentioned ceramic composite, the perovskite structure oxide particles are covered with MgO, MgAl.sub.2 O.sub.4, or ZrO.sub.2, and the ceramic matrix is Al.sub.2 O.sub.3.Type: GrantFiled: April 29, 1997Date of Patent: December 29, 1998Assignees: Agency of Industrial Science and Technology, Fine Ceramics Research AssociationInventors: Hae Jin Hwang, Masaki Yasuoka, Mutsuo Sando, Toru Nagai, Koichi Niihara
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Patent number: 5811071Abstract: A precursor, in gel form, of an oxide having the formula (I), BaO.n(Al.sub.2x Cr.sub.2y O.sub.3), where 1.ltoreq.n.ltoreq.6.6, (x+y)=1, and 0.ltoreq.y.ltoreq.0.5, said oxide being derivable from the precursor gel by the application of heat, is prepared by mixing a solution of a barium salt with a solution of an aluminium salt or a solution of an aluminium salt and a solution of a chromium salt, and polymerising the mixture to produce said precursor gel. A mixture suitable for firing to an oxide of the formula (II), BaO.m(Al.sub.2x Cr.sub.2y O.sub.3), where 4.6.ltoreq.m.ltoreq.6.6; (x+y)=1; and 0.ltoreq.y.ltoreq.0.5, comprises at least one of:(a) barium oxide;(b) a clean thermal precursor of barium oxide; and(c) barium mono-aluminate, BaO.Al.sub.2 O.sub.3 ; with at least one of:(A) alumina, Al.sub.2 O.sub.3 ;(B) hydrated forms of alumina, such as boehmite, Al.sub.2 O.sub.3.H.sub.2 O; and(C) a clean thermal precursor of aluminium oxide; and, where y is not zero, with at least one of(D) chromium(III) oxide, Cr.Type: GrantFiled: December 14, 1995Date of Patent: September 22, 1998Assignee: Alcan International LimitedInventors: Harold Garton Emblem, Thomas James Davies
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Patent number: 5764403Abstract: A real-time, multi-color image ?36! is displayed in a flat screen ?20! composed of a low-phonon, optically transparent, non-pixelated host material doped with active ions. The display uses intersecting infrared laser beams ?22, 24! of different wavelengths to induce a two-frequency upconversion process in the active ions at a point ?28! in the screen. When the ions relax, visible fluorescence is produced. Different points in the display are activated by directing the laser beams ?22, 24! to intersect at different locations within the screen. In one embodiment, beams from two lasers ?28, 30! are controlled by single axis mirrors ?32, 34!. In other embodiments, laser arrays or slab lasers are used to activate points within the screen. Through the use of additional lasers and dopants, multi-color images may be displayed.Type: GrantFiled: January 30, 1997Date of Patent: June 9, 1998Inventor: Elizabeth A. Downing
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Patent number: 5746991Abstract: A composition for growing a laser crystal is represented by the formula of Li ?R.sub.n .alpha..sub.1-n! ?(Ga.sub.p In.sub.q) .beta..sub.1-p-q ! F.sub.6+n where n is within a range from 10.sup.-5 to 0.1, each of p and q is within a range from 0 to 0.6, a total of p and q is within a range from 0.001 to 0.6, .alpha. is at least one member selected from the group consisting of Ca, Sr, Ba and Na, .beta. is at least one member selected from the group consisting of Al, Cr, Ni, Co and Fe, and R is a rare-earth element. The composition enables the distribution coefficient of rare-earth element to get closer to 1 and thus enables the laser crystal to have a high and uniform concentration of rare-earth element and to have a large size.Type: GrantFiled: August 23, 1996Date of Patent: May 5, 1998Assignee: Central Glass Company, LimitedInventor: Yoshinori Kubota
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Patent number: 5744015Abstract: An electrochemical process for producing unsaturated hydrocarbon compounds from unsaturated hydrocarbon compounds and for extracting oxygen from a gas containing N.sub.2 O, NO, NO.sub.2, SO.sub.2, or SO.sub.3 is described. The process is characterized by the use of mixed metal oxide materials having a perovskite structure represented by the formula:A.sub.s A'.sub.t B.sub.u B'.sub.v B".sub.w O.sub.xwherein A represents a lanthanide or Y, or a mixture thereof; A' represents an alkaline earth metal or a mixture thereof; B represents Fe; B' represents Cr or Ti, or a mixture thereof; and B" represents Mn, Co, V, Ni, or Cu, or a mixture thereof.Type: GrantFiled: June 7, 1995Date of Patent: April 28, 1998Inventors: Terry J. Mazanec, Thomas L. Cable, John G. Frye, Jr., Wayne R. Kliewer