Patents Examined by Susan Hollenbeck
-
Patent number: 5200370Abstract: Monocrystalline ceramic fibers are disclosed together with a process for preparing such fibers. Polycrystalline ceramic fibers in a tow are coated with a coating that is chemically substantially non-reactive with the ceramic (e.g. alumina fibers coated with molybdenum), and the coated fibers are drawn through a heating zone maintained at a temperature high enough to melt the fibers without melting the coating. The coated fibers are withdrawn from the heating zone and cooled rapidly enough to form a substantially monocrystalline ceramic. The protective coating may thereafter be removed to leave a tow of substantially single-crystal ceramic fibers. Monocrystalline ceramic fibers about 8-20 microns in diameter are prepared by the disclosed process.Type: GrantFiled: November 16, 1990Date of Patent: April 6, 1993Assignee: Fiber Materials, Inc.Inventors: James R. Lennox, Roger T. Pepper, Paul V. Chayka
-
Patent number: 5171720Abstract: A porous ceramic sinter and a process for producing the same are disclosed, which sinter has macropores with a pore size of from 20 to 2,000 .mu.m and three-dimensionally communicating pores that are made of interstices between secondary particles.Type: GrantFiled: September 20, 1989Date of Patent: December 15, 1992Assignee: Asahi Kogaku Kogyo K.K.Inventor: Michiko Kawakami
-
Patent number: 4987107Abstract: A ceramic composition for a reduction-reoxidation type semiconductive capacitor, comprising (A) barium titanate or barium titanate and strontium titanate, (B) titanium oxide, and (C) at least one oxide selected from the group consisting of the oxides severally of La, Ce, Nb, Nd, Dy, Y, Sb, W, and Ta in a molar ratio of 100:0.01.about.15:0.01.about.10 and further comprising (D) 0.001 to 1% by weight, based on the total amount of the compounds, (A), (B), and (C), of at least one oxide selected from the group consisting of the oxides severally of Cu, Zn, Al, Mg, and Mo and exhibiting a breakdown voltage of not less than 900 V, and insulation resistance of not less than 10.sup.10 .OMEGA., an electrostatic capacity per unit surface area of not less than 0.06 .mu.F/cm.sup.2, and a low dielectric loss, tan .delta., of not more than 2.0%.Type: GrantFiled: June 2, 1989Date of Patent: January 22, 1991Assignee: Nippon Oil & Fats Co., Ltd.Inventors: Kazuhito Narumi, Fumio Takeuchi, Michiaki Sakaguchi
-
Patent number: 4985076Abstract: An aqueous autocatalytic electroless gold plating composition having improved stability, a high plating rate, and excellent throwing power is provided which comprises about 0.002 to about 0.05 moles per liter (M) of a water-soluble alkali metal monovalent gold cyanide complex, about 0.01 to about 0.1M of a water-soluble cyanide compound, about 0.1 to about 1.0M of a carbonate compound, about 0.1 to about 0.45M of an aliphatic amine, and about 0.01 to about 0.1M of a reducing agent selected from the group consisting of water soluble alkali metal borohydrides and water soluble amine boranes, the plating composition to having a pH in the range of about 10-14.Type: GrantFiled: November 3, 1989Date of Patent: January 15, 1991Assignee: General Electric CompanyInventor: Charles D. Iacovangelo
-
Patent number: 4978641Abstract: Porous glass consisting essentially of silica, zicronia and an alkali metal compound, wherein the content of zirconia is at least 5% by weight and the content of the alkali metal compound is at least 2% by weight as calculated as M.sub.2 O wherein M is an alkali metal element, and the total pore volume (A) of pores having pore radii of from 20 to 10,000 .ANG. is at least 0.2 ml/g. and the proportion of the pore volume (B) of pores having pore radii of from 100 to 10,000 .ANG. to the total pore volume (A) of pores having pore radii of from 20 to 10,000 .ANG. is at least 80%.Type: GrantFiled: August 15, 1989Date of Patent: December 18, 1990Assignee: Mitsubishi Kasei CorporationInventors: Keisuke Wada, Yasushi Tsurita
-
Patent number: 4933309Abstract: A composite is produced comprised of ceramic oxide fibrous material which is coated with a noble metal and disposed in a ceramic oxide matrix. The composite can be produced by contacting the coated fibrous material with matrix-forming oxide powder to form a compact and densifying the compact. Densification can be carried out by techniques such as sintering, isostatic pressing, and hot pressing. The composite can also be produced by forming the coated fibrous material into a preform having an open porosity and infiltrating the preform with a vapor of the matrix-forming material.Type: GrantFiled: July 28, 1989Date of Patent: June 12, 1990Assignee: General Electric CompanyInventor: Krishan L. Luthra
-
Patent number: 4920083Abstract: A method for the production of ceramic oxide lakes, comprising the steps of: (i) preparing a colloidal foam by blowing a gas into an aqueous solution comprising a precursor salt of said ceramic oxide flake and a surfactant; (ii) precipitating flakes of said precursor salt in said colloidal foam; and (iii) dry and calcining said precipitated flakes to produce said ceramic oxide flakes.Type: GrantFiled: May 18, 1988Date of Patent: April 24, 1990Assignee: Research Triangle InstituteInventor: Venugopal B. Menon
-
Patent number: 4906598Abstract: A thermal storage brick for use with thermal storage heaters comprised of predetermined amounts of crushed taconite pellets, clay and talc. The ingredients are formed into a brick shape under approximately 4000 p.s.i. and are fired at approximately 2150.degree. F. and are allowed to soak for approximately five hours.Type: GrantFiled: November 17, 1988Date of Patent: March 6, 1990Inventor: Oscar E. Manz
-
Patent number: 4892586Abstract: A concrete composition for use in a roller compacted placing method includes a cement, an aggregate, an organic acid and/or a salt thereof and a set accelerating inorganic salt.Type: GrantFiled: June 3, 1988Date of Patent: January 9, 1990Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Yoshiharu Watanabe, Hisayuki Shimizu, Mineo Ito
-
Patent number: 4891072Abstract: A multi-component grouting system having at least one component wherein the active ingredient is contained in the dispersed phase of a water-in-oil emulsion, the oil providing an effective barrier against mixing of the components thereby enabling the components to be stored indefinitely in direct contact. The components may advantageously be encapsulated in a single compartment frangible casing for insertion into drillholes in rock. The grouting systems may be based on compositions comprising hardenable resins, Portland cement, Plaster of Paris, zinc oxide/zinc chloride, or sodium silicate.By eliminating the usual plastics film barrier between the grouting system components, intimate mixing of the components in a drillhole by rotation of the bolt to be fixed inthe drillhole may be more easily and reliably effected.Type: GrantFiled: July 5, 1983Date of Patent: January 2, 1990Assignee: Imperial Chemical Industries PLCInventor: John Cooper
-
Patent number: 4891344Abstract: A low dielectric constant ceramic substrate comprised of 90 to 98% of mullite (3Al.sub.2 O.sub.3. 2SiO.sub.2) and 10 to 2% of a sintering promotor comprised of 0.5 to 3% of magnesia (MgO) and 1.5 to 7% of calcium oxide (CaO).Type: GrantFiled: December 19, 1986Date of Patent: January 2, 1990Assignee: Fujitsu LimitedInventors: Yasumasa Wakasugi, Masahiro Sugimoto
-
Patent number: 4857486Abstract: Disclosed are an adhesive for oxide ceramics, which comprises as its effective ingredient a crystallized glass mainly comprising SiO.sub.2, Al.sub.2 O.sub.3, Li.sub.2 O, MgO and/or ZnO, and TiO.sub.2 and/or ZrO.sub.2, and also a method of bonding oxide ceramics together, which comprises heating oxide ceramics to be bonded together at 1200.degree. to 1600.degree. C. with the adhesive placed between the ceramics.Type: GrantFiled: May 12, 1988Date of Patent: August 15, 1989Assignee: Japan as represented by Director General of Agency of Industrial Science and TechnologyInventors: Yoshihiro Ebata, Masanori Kouyama, Nobuyuki Tamari, Takamichi Kawamoto