Patents Examined by Mark Bell
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Patent number: 4495298Abstract: A thallium-containing optical glass composition which comprises the following oxides in the indicated proportions in mole %: SiO.sub.2 35-80, Tl.sub.2 O 1-30, Tl.sub.2 O+R.sub.2 O (R being an alkali metal) 1-35, ZnO 0-35, GeO.sub.2 0-30, BaO 0-25, TiO.sub.2 0-20, MgO 0-20, B.sub.2 O.sub.3 0-less than 10, ZrO.sub.2 0-2, Al.sub.2 O.sub.3 0-8, SnO 0-5, CaO 0-10, SrO 0-10, PbO 0-10, La.sub.2 O.sub.3 0-5, Bi.sub.2 O.sub.3 0-8, and Ta.sub.2 O.sub.5 0-2, and satisfies the following relations:5.ltoreq.ZnO+GeO.sub.2 +BaO+TiO.sub.2 +MgO+B.sub.2 O.sub.3 .ltoreq.40,0.1.ltoreq.ZrO.sub.2 +Al.sub.2 O.sub.3 +SnO.ltoreq.8,and0.ltoreq.CaO+SrO+PbO+La.sub.2 O.sub.3 +Bi.sub.2 O.sub.3 +Ta.sub.2 O.sub.5 .ltoreq.10.Type: GrantFiled: May 11, 1982Date of Patent: January 22, 1985Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Takasi Yamagishi, Yukio Noguchi
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Patent number: 4495299Abstract: A thallium-containing optical glass composition which contains the following oxides in the indicated proportions in mole %:______________________________________ SiO.sub.2 35-80 Tl.sub.2 O 4-26 Tl.sub.2 O + R.sub.2 O 8-42 (in which R is an alkali metal) ZnO 6-26 ZrO.sub.2 0-2 Al.sub.2 O.sub.3 0-8 SnO and/or SnO.sub.2 0-5 B.sub.2 O.sub.3 0-less than 10 ______________________________________and satisfies the following relations:O.ltoreq.K.sub.2 O.ltoreq.104.ltoreq.Na.sub.2 O+Li.sub.2 O.ltoreq.260.1.ltoreq.ZrO.sub.2 +Al.sub.2 O.sub.3 +SnO and/or SnO.sub.2 .ltoreq.Type: GrantFiled: September 6, 1983Date of Patent: January 22, 1985Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Yukio Noguchi, Takashi Yamagishi
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Patent number: 4495122Abstract: Method for the production of a polycrystalline shaped body of silicon carbide of a density of at least 98% of the theoretical density of silicon carbide, prepared through pressureless sintering at temperatures from 1,900 to 2,200 C. from at least 97 weight % of .alpha.-silicon carbide and/or .beta.-silicon carbide under addition of up to 3 weight % of boron, characterized by the fact that the shaped body is prepared without any carbon additions to the batch and is pressureless sintered in a carbon containing protective gas atmosphere.Type: GrantFiled: November 23, 1981Date of Patent: January 22, 1985Assignee: Feldmuhle AktiengesellschaftInventors: Gerhard Leimer, Ernst Gugel
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Patent number: 4495301Abstract: Lightweight refractory monolith forming batch comprising selected high alumina materials.Type: GrantFiled: April 6, 1983Date of Patent: January 22, 1985Assignee: Dresser Industries, Inc.Inventor: Peter T. Sutor
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Patent number: 4492764Abstract: A refractory ceramic body having excellent bending strength and high hardness and with little porosity is obtained by sintering a powdery mixture comprising 5 to 95% by weight of a titanium carbonitride and 95 to 5% by weight of a metal boride such as metal diborides, e.g. titanium diboride, W.sub.2 B.sub.5 and Mo.sub.2 B.sub.5 at a temperature of 1700.degree. to 1800.degree. C. Further improvements can be obtained by partial replacement of the above mentioned components with elementary boron, titanium carbide or titanium nitride or when the titanium carbonitride component is a combination of at least two kinds of titanium carbonitrides having different chemical compositions relative to the proportion of the carbon and nitrogen.Type: GrantFiled: March 16, 1983Date of Patent: January 8, 1985Assignee: Agency of Industrial Science & TechnologyInventors: Tadahiko Watanabe, Yuko Tsuya, Yuji Enomoto
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Patent number: 4492763Abstract: The present invention teaches infrared chalcogenide glass compositions having very low dispersion in the eight to twelve micron range, which are formed as III-V-VI-VII compositions, e.g. 14% (atomic) gallium plus 25% antimony plus 40% selenium plus 21% bromine. The introduction of a group VII component into a chalcogenide glass provides low dispersion, and the group III component compensates for the strong devitrification tendencies of the group VII component and maintains the mechanical properties of the glass.Type: GrantFiled: July 6, 1982Date of Patent: January 8, 1985Assignee: Texas Instruments IncorporatedInventors: Patrick A. Trotta, Paul A. Zak
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Patent number: 4490737Abstract: A low temperature insulating glass for use in semiconductor devices comprises a mixture of germanium, silicon, oxygen and phosphorus. In the preferred embodiment, the glass comprises a mixture of about 40% to 55% silicon dioxide (SiO.sub.2), about 55% to 40% of germanium dioxide (GeO.sub.2) and from 1% to about 5% of phosphorus pentoxide (P.sub.2 O.sub.5), by mole percent.Type: GrantFiled: March 26, 1982Date of Patent: December 25, 1984Assignee: Fairchild Camera & Instrument Corp.Inventors: John M. Pierce, William I. Lehrer
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Patent number: 4490474Abstract: A fused cast ceramic composition having superior corrosion and stoning resistance in the presence of E glass when compared with prior art compositions having comparable chromia content. The composition is a solidified fusion of from about 65 to about 98 weight percent Cr.sub.2 O.sub.3, from about 0.75 to about 4 weight percent MgO and from about 1 to about 34.25 weight percent alumina. The invention also comprises the method for manufacturing the composition by fusing the appropriate materials at the required concentrations.Type: GrantFiled: June 13, 1983Date of Patent: December 25, 1984Assignee: Kennecott CorporationInventor: Walter T. Staten
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Patent number: 4487841Abstract: There is disclosed a material for hot or plasma spraying, especially a material based on oxide ceramics, and a process for the production thereof. The composition of the invention is a mixture of powdered oxides containing at least two fundamental oxides with high melting point, and at least one glass-forming oxide the melting point of which is lower. The invention also includes a process for the production of such composition by the melting and agglomeration of individual components in the oxidizing medium of a plasma stream, including the special treatment of the starting components.Type: GrantFiled: February 12, 1982Date of Patent: December 11, 1984Assignee: Vysoka skola chemicko-technologickaInventors: Miloslav Bartuska, Petr Kroupa, Josef Szabo, Karel Zverina
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Patent number: 4486544Abstract: A powder composition suitable for the pressureless thermal sintering of articles which may be used in aluminium electro-thermics contains titanium boride with boron and titanium hydride as densifying additives. During sintering these additives form titanium boride. As this is identical to the substance of the sintered article the additives therefore do not constitute impurities in the sintered article.Type: GrantFiled: August 27, 1982Date of Patent: December 4, 1984Assignee: Battelle Memorial InstituteInventors: Olivier De Pous, Dominique Richon, Hans Novotny
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Patent number: 4486543Abstract: Polycrystalline shaped body of a density of at least 98% of the theoretical density of silicon carbide, consisting of at least 92 weight % of .alpha.-silicon carbide and/or .beta.-silicon carbide, which is present in the form of a homogeneous texture with grains of maximal 10 .mu.m, and is characterized by the fact that, besides a content of up to 3 weight % of boron, a share of about 0.5 to 5 weight % of a metal or rare earth element that acts reducing or mixtures thereof is present, and the body shows a transverse rupture strength (determined by the four-point method) of at least 500 N/mm.sup.2 up to 1,400 C and is essentially free of free carbon.A method for the production of shaped bodies through the pressureless sintering of the silicon carbide starting material, characterized by the fact that about 0.Type: GrantFiled: November 23, 1981Date of Patent: December 4, 1984Assignee: Feldmuhle AktiengesellschaftInventors: Gerhard Leimer, Ernst Gugel
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Patent number: 4486541Abstract: A phototropic glass with an optical position n.sub.d .ltoreq.1.59 and v.sub.d .gtoreq.40 and with a density of .ltoreq.3.2 g/cm.sup.3 is described for the first time. Its composition lies within the system ofSiO.sub.2 --R.sub.2 O.sub.3 --R.sub.2 O--RO--RO.sub.x --R.sub.2 O.sub.5,wherein R.sub.2 O.sub.3 is Al.sub.2 O.sub.3, B.sub.2 O.sub.3 and rare earth oxides; R.sub.2 O is alkali metal oxides; RO is alkaline earth metal oxides, ZnO, SnO, or PbO; RO.sub.x is GeO.sub.2, ZrO.sub.2, TiO.sub.2, or WO.sub.3 ; and R.sub.2 O.sub.5 is Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, or P.sub.2 O.sub.5.Type: GrantFiled: December 8, 1983Date of Patent: December 4, 1984Assignee: Schott GlaswerkeInventors: George Gliemeroth, Uwe Eichhorn
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Patent number: 4485179Abstract: A silicon carbide fiber reinforced glass-ceramic matrix composite is disclosed having high strength, fracture toughness, and improved oxidative stability even at high temperature use, e.g., in excess of 1000.degree. C. The composite is made up of a plurality of glass-ceramic layers, each layer reinforced with a plurality of unidirectional continuous length silicon carbide or discontinuous SiC fibers. The composite is formed by starting with the matrix material (preferably lithium aluminosilicate) in the glassy state and converting it from the glassy state to the crystalline state after densification of the composite. Ta or Nb compounds are added to the matrix composition prior to consolidation to form a reaction or diffusion barrier around the SiC fiber, resulting in composites with high temperature oxidation stability. Substitution of at least part of the Li.sub.2 O in the matrix with MgO results in an even higher temperature stable composite, e.g., up to about 1200.degree. C.Type: GrantFiled: May 20, 1982Date of Patent: November 27, 1984Assignee: United Technologies CorporationInventors: John J. Brennan, Kenneth Chyung, Mark P. Taylor
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Patent number: 4484644Abstract: An embodiment of the article comprises a metallic body formed, by a powder metallurgy technique, of steel powder and tungsten carbide particles, and forged, having a total density of not less than one hundred percent. The method, then, comprises (a) the powder metallurgy steps of forming and sintering the body, and (b) the subsequent forging step, to produce the one hundred percent total density steel and tungsten carbide article.Type: GrantFiled: September 2, 1980Date of Patent: November 27, 1984Assignee: Ingersoll-Rand CompanyInventors: John P. Cook, Bani R. Banerjee
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Patent number: 4483933Abstract: A semiconductor ceramic composition of a barium titanate system comprises a main component containing a minor quantity of one or more semiconductor-forming elements, and additives of manganese oxides and silica incorporated therein, and is characterized by that the main component consists essentially of 30 to 95 mol % of BaTiO.sub.3, 3 to 25 mol % of CaTiO.sub.3, 1 to 30 mol % of SrTiO.sub.3 and 1 to 50 mol % of PbTiO.sub.3. The contents of manganese oxides and silica are 0.03 to 0.15 mol %, preferably, 0.03 to 0.10 mol % in terms of Mn, and 0.5 to 5 mol % in terms of SiO.sub.2, respectively, with respect to one mole of the main component. One or more semiconductor-forming elements are selected from the group consisting of rare earth elements, Nb, Bi, Sb, W and Th, and the content of the elements is 0.2 to 1.0 mol %.Type: GrantFiled: April 13, 1984Date of Patent: November 20, 1984Assignee: Murata Manufacturing Co., Ltd.Inventors: Takashi Kobayashi, Motoi Nishii
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Patent number: 4482935Abstract: A dielectric composition which is particularly suitable for the manufacture of ceramic capacitors, comprises lead magnesium niobate with additions of one or more lead titanate, lead stannate, or lead zirconate. The composition can be fired at a temperature between 950.degree. and 1100.degree. C., which is lower than the conventional firing temperatures of 1200.degree. to 1400.degree. C. The lower firing temperature means that, in the case of multilayer ceramic capacitors, the internal electrodes can be made of cheaper materials than previously with resultant materials and process cost savings. Some of the compositions exhibit higher dielectric constants than conventional Z5U ceramics, which means that capacitor device size can also be reduced.Type: GrantFiled: April 17, 1984Date of Patent: November 13, 1984Assignee: ITT Industries, Inc.Inventor: Jennifer M. Wheeler
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Patent number: 4481179Abstract: A method whereby silicon carbide-bonded SiC fiber composites are prepared from carbon-bonded C fiber composites is disclosed. Carbon-bonded C fiber composite material is treated with gaseous silicon monoxide generated from the reaction of a mixture of colloidal silica and carbon black at an elevated temperature in an argon atmosphere. The carbon in the carbon bond and fiber is thus chemically converted to SiC resulting in a silicon carbide-bonded SiC fiber composite that can be used for fabricating dense, high-strength high-toughness SiC composites or as thermal insulating materials in oxidizing environments.Type: GrantFiled: October 12, 1983Date of Patent: November 6, 1984Assignee: The United States of America as represented by the United States Department of EnergyInventor: George C. Wei
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Patent number: 4480044Abstract: The present invention relates to the production of photothermally crystallizable, chemically-machinable glass-ceramic articles exhibiting coefficients of thermal expansion over the temperature interval of 20.degree.-400.degree. C. between 120-160.times.10.sup.-7 /.degree. C. Base glass articles having compositions consisting essentially, in weight percent, of 5.5-15% Li.sub.2 O, 2-25% Al.sub.2 O.sub.3, the weight ratio Al.sub.2 O.sub.3 :Li.sub.2 O being less than 1.7:1, 60-85% SiO.sub.2, and at least one photosensitive metal in the indicated proportion selected from the group of 0.001-0.03% gold, computed as Au, 0.001-0.3% silver, computed as AgCl, and 0.001-1% copper, computed as Cu.sub.2 O, are first exposed to ultraviolet radiations to develop a latent image therein, then heated to a temperature between the annealing and softening points thereof to generate metallic nuclei therein and the growth of lithium metasilicate particles thereon, and, finally, heated to a temperature in excess of 700.degree. C.Type: GrantFiled: February 1, 1984Date of Patent: October 30, 1984Assignee: Corning Glass WorksInventor: Patrick McAlinn
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Patent number: 4478947Abstract: A non-crystallizing sealing glass composition is described consisting essentially of from about 75.50 to 84.00 wt. % lead oxide, from about 11.25 to 14.25 wt. % boron oxide, an additional component selected from the group consisting of up to 3.10 wt. % zinc oxide and up to 9.33 wt. % bismuth oxide; other compositions could include up to 0.88 wt. % tin oxide, and up to 1.51 wt. % germainium oxide. The glass compositions include .beta.-eucryptite in an amount sufficient to provide a coefficient of expansion of about 83.5 to 71.5.times.10.sup.-7 .degree. C..sup.-1 (about 13.5 to 17.0 wt %); the glass is particularly useful in sealing a gas panel.Type: GrantFiled: June 21, 1983Date of Patent: October 23, 1984Assignee: International Business Machines CorporationInventor: Robert A. Rita
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Patent number: 4478641Abstract: The instant invention relates to the development of an embedment material suitable for use in heat treating glass castings to convert them into glass-ceramic articles, whereby the shrinkage customarily experienced resulting from densification of the casting during conversion to a glass-ceramic is minimized and sound glass-ceramic articles of tight dimensional tolerances can be produced. The inventive embedment materials will:(a) contain an inorganic component which is subject to an inversion accompanied with a large change in volume at a temperature below the set point of the glass-ceramic article;(b) demonstrate a coefficient of thermal expansion equal to or no more than about 40.times.10.sup.-7 /.degree.C.Type: GrantFiled: March 21, 1983Date of Patent: October 23, 1984Assignee: Corning Glass WorksInventors: Peter J. Adair, Michael P. Hobczuk, Paul I. Kingsbury, John W. Nelson