Patents Examined by Edward J. Meros
  • Solid electrolyte for use in oxygen concentration sensor
    Patent number: 4328295
    Abstract: A solid electrolyte for an oxygen concentration sensor is provided by mixing ZrO.sub.2 and about 7.5 to 8.5% by mol of a stabilizer such as Y.sub.2 O.sub.3, grinding the mixture to have a BET specific surface are of about 9 to 20 m.sup.2 /g, adding to the ground mixture a forming aid, forming the mixture into a predetermined configuration and firing the formed mixture at about 1420.degree. to 1520.degree. C. The electrolyte has a surface-average grain size of about 5 microns or less and a structure of a cubic phase alone at the surface thereof and even in a finely ground state.
    Type: Grant
    Filed: February 5, 1981
    Date of Patent: May 4, 1982
    Assignee: Nippondenso Co., Ltd.
    Inventors: Katsuhiko Tanaka, Toshitaka Saito, Masatoshi Suzuki, Masami Ouki
  • Metal-micelle asbestos and treatment of asbestos and other silicate minerals to reduce their harmful properties
    Patent number: 4328197
    Abstract: Silicate minerals, including asbestos fibres, are rendered less harmful by forming metal-micelle polymer coatings on the silicate. A metal-micelle polymer coating is formed on a silicate by contacting a silicate mineral, such as asbestos, with a metal-weak base-strong acid aqueous ion system, or a metal-strong base-weak acid ion system. In these systems the metal is selected from the group consisting of manganese, chromium, cobalt, iron, copper, aluminum and mixtures of these metals. The product of reacting asbestos fibres with these systems is less irritating to living cells than asbestos fibres and also has substantially the same physical and chemical properties as asbestos fibres and can thus be substituted for asbestos fibres in most technological applications.
    Type: Grant
    Filed: January 8, 1980
    Date of Patent: May 4, 1982
    Assignee: Flow General, Inc.
    Inventor: Earl S. Flowers
  • Solid electrolyte for use in oxygen concentration sensor
    Patent number: 4328296
    Abstract: A solid electrolyte for an oxygen concentration sensor is provided by mixing ZrO.sub.2 and about 6.5 to 7% by mol of a stabilizer such as Y.sub.2 O.sub.3, grinding the mixture to give a BET specific surface area of about 9 to 20 m.sup.2 /g, adding to the ground mixture a forming aid, forming the mixture into a predetermined configuration and firing the formed mixture at about 1420.degree. to 1480.degree. C. The electrolyte has a surface-average grain size of about 5 microns or less and a structure of a cubic phase and a monoclinic and/or tetragonal phase at the surface thereof and, furthermore, may contain about 5% or less of a monoclinic phase per the total of the cubic and monoclinic phases, in a finely ground state.
    Type: Grant
    Filed: February 5, 1981
    Date of Patent: May 4, 1982
    Assignee: Nippondenso Co., Ltd.
    Inventors: Katsuhiko Tanaka, Toshitaka Saito, Masatoshi Suzuki, Masami Ouki
  • Multicellular monolithic ceramic body and preparation thereof
    Patent number: 4327188
    Abstract: A multicellular monolithic ceramic body having many gas passages partitioned by thin walls is made of aluminum titanate as a major cnstituent and has less than 0.15% of a thermal expansion coefficient at 1000.degree. C. and higher than 350 kg./cm.sup.2 of a compressive strength as zero of an open frontal area as the properties in the direction along the gas passages and more than 35% of a porosity.
    Type: Grant
    Filed: November 18, 1980
    Date of Patent: April 27, 1982
    Assignee: Asahi Glass Company, Ltd.
    Inventors: Yasuhiko Endo, Takashi Mimori, Motohiro Goto
  • Method for refining metal carbides containing free carbon
    Patent number: 4327067
    Abstract: Metal carbide powders containing free carbon which have heretofore been difficult to refine can be refined excellently by charging the metal carbide powders in a fluidizing bed consisting of fluidized heat-resistant particles and having a temperature of a determined range to burn and remove the free carbon contained therein, and by subsequently discharging refined metal carbide powders and combustion gas from an upper part of the fluidizing bed for recovery of the refined metal carbide powders.
    Type: Grant
    Filed: January 2, 1980
    Date of Patent: April 27, 1982
    Assignee: Ibigawa Electric Industry Co., Ltd.
    Inventors: Kunio Kato, Yoshiki Sugiyama, Ryo Enomoto
  • Dense shaped articles of polycrystalline .beta.-silicon carbide and process for the manufacture thereof by hot-pressing
    Patent number: 4326039
    Abstract: The invention relates to dense shaped articles of polycrystalline .beta.-silicon carbide containing small amounts of aluminum and optionally, nitrogen and/or phosphorus, having a virtually single-phase microstructure since the additional constituents are substantially in the form of a solid solution in the .beta.-SiC lattice. The shaped articles are characterized by high temperature flexural strengths of at least 600 N/mm.sup.2 at temperatures up to 1450.degree. C. The fracture mechanism is transgranular up to at least 1450.degree. C. The shaped articles are manufactured by hot-pressing and simultaneously shaping pulverulent .beta.-silicon carbide with small amounts of an aluminum-containing additive, such as aluminum powder or aluminum nitride and/or aluminum phosphide, at temperatures between 1750.degree. C. and 2200.degree. C. under a pressure of at least 100 bar (10 MPa).
    Type: Grant
    Filed: June 25, 1980
    Date of Patent: April 20, 1982
    Assignee: Elektroschmelzwerk Kempten GmbH
    Inventors: Jochen Kriegesmann, Alfred Lipp, Klaus Reinmuth
  • Purified monoammonium phosphate process
    Patent number: 4325927
    Abstract: A method of producing purified monoammonium phosphate from wet process phosphoric acid and ammonia is provided. The ammoniation takes place in two stages, the acid being ammoniated in the first stage to a pH between about 1.5 and 2.5. This mixture is allowed to age after which the mixture is ammoniated to a pH between about 4 and 5. An impurity-containing precipitate is formed in the first and second stages of ammoniation that is easily filterable from the monoammonium phosphate solution derived from the second ammoniation stage.
    Type: Grant
    Filed: December 10, 1980
    Date of Patent: April 20, 1982
    Assignee: Agrico Chemical Company
    Inventors: Charles W. Weston, John W. Wen
  • Material and method to dissociate water at controlled rates
    Patent number: 4324777
    Abstract: A material and method for the decomposition/dissociation of water into hydrogen and oxygen is disclosed. The material comprises an amalgam of an alkali metal, mercury, and aluminum combined with a catalytically effective amount of an alloy comprising platinum and at least one metal selected from the group consisting of germanium, antimony, gallium, thallium, indium, cadmium, bismuth, lead, zinc and tin, and with an extender metal to control the rate of dissociation of the water while being non-reactive with the amalgam during dissociation.
    Type: Grant
    Filed: October 16, 1979
    Date of Patent: April 13, 1982
    Inventor: Eugene R. Anderson
  • Starting mixture for a dielectric composition, screen printing paste having such a starting mixture, and product obtained
    Patent number: 4323652
    Abstract: Dielectric composition, screen printing paste having such a composition and products obtained.The invention describes a dielectric composition which may be used in particular as an insulating screen-printing paste, which is compatible with a copper-containing conductive screen-printed layer, the paste containing, dispersed in an organic vehicle, a mixture of ceramic phases, consisting essentially of zinc oxide and cobalt oxide, and a vitreous phase containing at least a glass which can be devitrified by dissolving the zinc oxide.
    Type: Grant
    Filed: March 14, 1980
    Date of Patent: April 6, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Hugues Baudry, Claude Morhaim, Dominique Bricout
  • Synthesis of molecular sieves using beta-diketones as organic templates
    Patent number: 4323481
    Abstract: A ferrierite crystalline aluminosilicate is prepared by (1) forming an aqueous mixture of an oxide of aluminum, an oxide of silicon, a metal cation and a beta-diketone as a template compound, (2) maintaining the pH of such mixture between 9 and 14, and (3) crystallizing the mixture.
    Type: Grant
    Filed: February 26, 1981
    Date of Patent: April 6, 1982
    Assignee: Standard Oil Company (Indiana)
    Inventor: James A. Kaduk
  • High pressure reaction vessel for growing diamond on diamond seed and method therefor
    Patent number: 4322396
    Abstract: Reaction vessel construction is described for suppressing spontaneous diamond nucleation and simultaneously reducing the flaw content in the main body of diamond grown from diamond seed material by the process broadly disclosed in U.S. Pat. No. 3,297,407 to Wentorf, Jr.In the reaction vessel construction the body of catalyst-solvent metal is formed with at least one small tip projecting from the underside thereof. A single diamond seed is placed in contact with this (or each) tip. The underside of the plug of catalyst-solvent metal is in contact with a nucleation-suppressing disc, or layer, of a material different from the catalyst-solvent and selected from a specific group of materials. In each case the tip of catalyst-solvent metal projects through a hole in the disc or layer to make contact with the diamond seed material.
    Type: Grant
    Filed: May 9, 1980
    Date of Patent: March 30, 1982
    Assignee: General Electric Company
    Inventor: Herbert M. Strong
  • Process for producing carbon fibers
    Patent number: 4320107
    Abstract: A fibrous carbon is prepared by dissolving coal in a hydrocarbon solvent by heating under hydrogen pressure, by subjecting to melt spinning a solvent-refined coal obtained by successively removing insoluble residues and the solvent from the resultant solution, by making the fiber thus obtained non-fusible, and then by subjecting same to carbonization. The melt spinning may be effected by mixing a highly aromatic bituminous substance with the solvent refined coal. Alternatively, the solvent-refined coal may be pretreated prior to melt spinning by extracting it with a non-aromatic solvent to remove soluble components therefrom.
    Type: Grant
    Filed: November 23, 1979
    Date of Patent: March 16, 1982
    Assignee: Mitsui Coke Co. Ltd.
    Inventors: Mikio Oyabu, Kenji Fukuda, Keiichi Hirata
  • Process for the removal of metals from carbon black
    Patent number: 4320108
    Abstract: The invention relates to a process for the removal of metals, especially of iron and/or nickel and/or vanadium or their compounds, from carbon black. To this end, the invention provides for an aqueous carbon black suspension to be heated to a temperature of about 30.degree. to 90.degree. C., for chlorine to be passed therethrough with agitation. The chlorine gas is used in a stoichiometric excess, based on the metal content of the aqueous carbon black suspension. Next, the carbon black is separated from the aqueous suspension and dried.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: March 16, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Wolter, Gero Heymer
  • Method of stabilizing hydrogen peroxide solutions
    Patent number: 4320102
    Abstract: A method of stabilizing aqueous hydrogen peroxide solutions against decomposition catalyzed by a combination of iron and copper consists of adding to the solution an amount of alkali metal meta- and pyrophosphates effective to prevent decomposition and adjusting the pH of the solution to 2-4.
    Type: Grant
    Filed: October 10, 1980
    Date of Patent: March 16, 1982
    Assignee: Air Products and Chemicals, Inc.
    Inventors: Augustine I. Dalton, Jr., Jeffery V. Bauer
  • Flexible integrated method for the production of ammonia and urea
    Patent number: 4320103
    Abstract: In an integrated flexible installation for producing ammonia and urea, the improved method which consists in that a portion of the gaseous stream comprising carbon dioxide, hydrogen and nitrogen is fed to a complementary decarbonation area and then admixed with a portion of a similar, but non-decarbonated stream of gas prior to entering the carbon-dioxide-absorption unit. Liquid ammonia is recovered from a portion of the ammoniated aqueous solution used for abating the ammonia and sent to a distillation column to recover liquid ammonia therefrom.
    Type: Grant
    Filed: September 4, 1980
    Date of Patent: March 16, 1982
    Assignee: Snamprogetti S.p.A.
    Inventor: Giorgio Pagani
  • Method of manufacturing a dense silicon carbide ceramic
    Patent number: 4318876
    Abstract: A method of manufacturing a dense silicon carbide ceramic includes heat treating an alpha silicon powder in a vacuum to between 1200.degree. and 1400.degree. C., adding a boron powder either before or after heat treating, then, adding a substance containing carbon, milling the mixture, compressing the milled mixture into a desired shape, sintering the formed shape at 2100.degree. C. in an argon atmosphere. The method has particular application to manufacturing parts for gas turbines.
    Type: Grant
    Filed: October 3, 1980
    Date of Patent: March 9, 1982
    Assignee: Societe Anonyme dite: Compagnie Generale d'Electricite
    Inventor: Daniel Broussaud
  • Lightweight ceramic composition
    Patent number: 4318996
    Abstract: This invention provides a lightweight ceramic composition which is characterized by an average bulk density between about 10-105 PCF, and a compressive strength between about 300-10,000 psi.In a preferred embodiment, this invention provides an extruded structural cellular clay product having pores which are substantially non-interconnected and elongated in a single directional configuration, and having a density gradient in at least one cross-sectional plane, in which gradient the higher density is in proximity to the outer surfaces.
    Type: Grant
    Filed: April 21, 1980
    Date of Patent: March 9, 1982
    Assignee: Princeton Organics Incorporated
    Inventor: Jules Magder
  • Carbon fiber production using high pressure treatment of a precursor material
    Patent number: 4317809
    Abstract: A process for producing a carbon fiber includes the steps of heating a selected precursor material under high pressure, thereafter heating the precursor material under atmospheric pressure with sparging to form a mesophase pitch, spinning the mesophase pitch into at least one pitch fiber, thermosetting the pitch fiber, and carbonizing the pitch fiber to obtain the carbon fiber.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: March 2, 1982
    Assignee: Union Carbide Corporation
    Inventors: Irwin C. Lewis, Arthur W. Moore
  • Preparation of reactive beta-dicalcium silicate
    Patent number: 4314980
    Abstract: This invention relates to the preparation of fine particles of reactive beta-dicalcium silicate by means of a solid state process which comprises firing a mixture of calcium sulfate, silica and a reducing additive selected from the group consisting of calcium sulfide, carbon, carbon monoxide, methane and hydrogen, at a temperature of about 850.degree.-1000.degree. C. A carrier gas such as nitrogen or carbon dioxide may also be added, if desired. A high concentration of sulfur dioxide is a by-product of this process.
    Type: Grant
    Filed: February 28, 1980
    Date of Patent: February 9, 1982
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Ming-Shing Shen, James M. Chen, Ralph T. Yang
  • Industrial process for continuous production of zeolite A
    Patent number: 4314979
    Abstract: A process for continuous preparation of zeolite A of constant and homogeneous quality, consisting of instantly and continously mixing a sodium silicate solution and a sodium aluminate solution in the correct proportions and at an elevated temperature followed by transfer of the resulting slurry to a crystallization reactor. The product is recovered from the crystallization reactor washed and dried.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: February 9, 1982
    Assignee: PCUK Produits Chimiques Ugine Kuhlmann
    Inventor: Jean Deabriges