Patents Examined by Lori S. Freeman
  • Patent number: 4713224
    Abstract: There is disclosed a one-step process for purifying an inert gas achieved by contacting the inert gas including minute quantities of an impurity selected from the group consisting of CO, CO.sub.2, O.sub.2, H.sub.2, H.sub.2 O and mixtures thereof with a particulate material comprised of nickel in an amount of at least about 5% by weight as elemental nickel distributed over an effective area of surface, typically from about 100 to 200 m.sup.2 /g, thereby forming an inert gas having less than 1 ppm and preferably less than 0.1 ppm of any such impurity.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: December 15, 1987
    Assignee: The BOC Group, Inc.
    Inventors: Satish Tamhankar, William R. Weltmer
  • Patent number: 4710368
    Abstract: High purity silicon nitride particles are disclosed which are essentially alpha crystalline and which have a surface area of greater than about 25 m.sup.2 /g.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: December 1, 1987
    Assignee: GTE Products Corporation
    Inventors: Joseph E. Ritsko, Howard L. Acla
  • Patent number: 4710362
    Abstract: Carbon dioxide is selectively removed from an acid gas stream containing carbon dioxide and sulfur-containing components including hydrogen sulfide by counter-currently contacting the acid gas stream with an aqueous solution of a treating agent in order to selectively absorb carbon dioxide from the gas stream, the treating agent being an aqueous solution of a polyoxypropylene triamine having the formula: ##STR1## wherein R' represents a methylene group and R" represents hydrogen or methyl or ethyl and wherein the sum of x+y+z is a positive integer having a value of from about 4 to about 6.
    Type: Grant
    Filed: May 5, 1986
    Date of Patent: December 1, 1987
    Assignee: Texaco Inc.
    Inventor: Edward C. Y. Nieh
  • Patent number: 4708859
    Abstract: Precipitation silicas, in the form of aggregates as shown in FIG. 1, having a mean projected area of the aggregates which is higher than about 8,000 nm.sup.2 and preferably is higher than about 15,000 nm.sup.2. The present invention also concerns a process for the production of precipitation silica by maintaining a constant-volume reaction medium to provide a suitable colloids of silica, reacting the colloids with an electrolyte and consolidating the resulting product by the addition of a solution of silicate and an acidifying agent to obtain a precipitation silica.
    Type: Grant
    Filed: June 24, 1986
    Date of Patent: November 24, 1987
    Assignee: Rhone-Poulenc Chimie
    Inventor: Yvonick Chevallier
  • Patent number: 4705673
    Abstract: This invention discloses mixtures of alkyl dialcohol amines and mono alkyl ethers of polyethylene glycols which are useful in removing acidic gases from gaseous mixtures. The solvent mixtures contain between 1.5 N and 5.0 N methyl diethanolamine (MDEA), 10 to 40 percent water and the balance is methoxytriglycol (MTG). The overall heat of reaction of the solution is typically less than 500 BTU/lb CO.sub.2, and remains as a single liquid phase during normal gas scrubber operating conditions.
    Type: Grant
    Filed: April 22, 1986
    Date of Patent: November 10, 1987
    Assignee: Union Carbide Corporation
    Inventors: Paul J. Capobianco, Kenneth F. Butwell, Edward J. Kossakowski
  • Patent number: 4704264
    Abstract: A process for producing silane, which comprises forming a powdery mixture by mixing silica powder recovered from geothermal hot water with metallic magnesium powder, heating and reducing said powdery mixture to convert it to magnesium silicide and then reacting an organic acid with said magnesium silicide to produce silane and recovering said silane.
    Type: Grant
    Filed: July 7, 1986
    Date of Patent: November 3, 1987
    Assignee: Idemitsu Kosan Company Limited
    Inventor: Junzo Harada
  • Patent number: 4702901
    Abstract: A method of growing silicon carbide whiskers, especially in the .beta. form, using a heating schedule wherein the temperature of the atmosphere in the growth zone of a furnace is first heated to or beyond the growth temperature and then is cooled to or below the growth temperature to induce nucleation of whiskers at catalyst sites at a desired point in time which results in the selection.
    Type: Grant
    Filed: March 12, 1986
    Date of Patent: October 27, 1987
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Peter D. Shalek
  • Patent number: 4702900
    Abstract: In a method of producing silicon carbide by heating starting materials comprising siliceous material and carbonaceous material in a non-oxidizing atmosphere, those ingredients contained in gases evolved upon heating and solidified at a low temperature into impurities for silicon carbide are eliminated from the atmosphere during heating.
    Type: Grant
    Filed: April 8, 1986
    Date of Patent: October 27, 1987
    Assignee: Bridgestone Corporation
    Inventors: Yasuo Kurachi, Katsuhiko Arai, Hiroaki Wada, Yoji Watabe, Sanae Irako
  • Patent number: 4701316
    Abstract: Silicon nitride powder may be prepared by subjecting a composite comprising at least a monolayer of a carbonaceous pyropolymer possessing recurring units containing at least carbon and hydrogen atoms on the surface of a silica support to the action of nitrogen-containing atmospheres at nitriding conditions to form silicon nitride.
    Type: Grant
    Filed: August 29, 1986
    Date of Patent: October 20, 1987
    Assignee: Allied Corporation
    Inventors: George R. Lester, Stephen T. Gonczy, Lawrence B. Welsh, Gerald T. Stranford
  • Patent number: 4701317
    Abstract: A highly electroconductive carbonaceous film having an electrical conductivity of at least about 1000 s/cm is prepared by thermally decomposing a diethynylbenzene in a carrier gas composed of an inert gas at a temperature of about C. to about C.
    Type: Grant
    Filed: September 8, 1986
    Date of Patent: October 20, 1987
    Assignee: Director-General of Agency of Industrial Science and Technology
    Inventors: Tatsumi Arakawa, Masaru Ozaki, Yukihiro Ikeda
  • Patent number: 4696808
    Abstract: A process for the preparation of transparent silica gels which can be used as crystal growth media is disclosed. A quantity of cation exchange resin beads is placed in a solution of a soluble potassium salt and stirred for several hours to allow the potassium ions to replace the cations on the resin beads. The supernatant liquid is then decanted through a filter, and the treated resin beads are rinsed with distilled water to remove excess salts. The treated resin beads are then transferred into a sodium silicate solution. The resulting mixture is stirred to allow the potassium ions on the treated resin beads to exchange with the sodium ions in the sodium silicate solution. The treated silicate solution is then poured through a coarse filter. A volume of boiled, cooled distilled water is added to a volume of the treated silicate solution, after which a volume of acetic acid solution is added to the mixture of distilled water and treated silicate solution.
    Type: Grant
    Filed: November 24, 1986
    Date of Patent: September 29, 1987
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Patrick G. Barber, Norman R. Simpson
  • Patent number: 4695441
    Abstract: Disclosed is a method for making silane. A silicon tetrahalide having the general formula SiX.sub.4 is reacted with a compound which can be alcohols to C.sub.4, alkanes to C.sub.4, alkenes to C.sub.4 alkenes to C.sub.4 or a mixture thereof, where X is independently selected from the halogens, to produce a product having the general formula SiR.sub.4, where each R is independently selected from alkoxy to C.sub.4, alkyl to C.sub.4, alkylene to C.sub.4 and alkenyl to C.sub.4. The SiR.sub.4 is then reacted with hydrogen to produce the silane.
    Type: Grant
    Filed: February 2, 1987
    Date of Patent: September 22, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: Edward J. Lahoda, Herbert A. Burgman, Young J. Kwon
  • Patent number: 4690811
    Abstract: The present invention provides a process for preparing silicon carbide whiskers. According to the process, carbon black having the following properties (a) to (c) is blended, as a carbonaceous material, with a silicon source material, and the resulting mixture is heated in a non-oxidizing atmosphere at 1, to 1, C.(a) Nitrogen adsorption specific surface area: 150 to 500 m.sup.2 /g(b) Dibutyl phthalate absorption: 120 to 200 ml/100 g.(c) Tint strength (%): equal to or below a value calculated according to the following formula:0.3496.times.(nitrogen adsorption specific surface area)-0.2143.times.(dibutyl phthalate absorption)+101.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: September 1, 1987
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Tohru Kida, Motohiro Yamamoto
  • Patent number: 4690806
    Abstract: A novel high sulfur capacity adsorbent capable of high rates of sulfur adsorption from process streams, which is readily regenerable by simple gas stripping. The adsorbent is characterized as a spinel compound of the formula M[N.sub.x Al.sub.2-x ]O.sub.4, where M is one or more divalent cations selected from the group consisting of copper, Group II-B, i.e., zinc, cadmium, and mercury, and chromium, and Iron Group metals, i.e., iron, cobalt, and nickel, and magnesium, N is one or more trivalent cations selected from the group consisting of Group VI-B, i.e., chromium, molybdenum, and tungsten, manganese, and Iron Group metals, i.e., iron, cobalt and nickel, x is a positive number of value greater than 0 and less than 2.0, and the total cationic charge of M[N.sub.x Al.sub.2-x ] is 8. The sorbent readily adsorbes sulfur, e.g., organosulfur compounds and hydrogen sulfide, from gas streams.
    Type: Grant
    Filed: May 1, 1986
    Date of Patent: September 1, 1987
    Assignee: Exxon Research and Engineering Company
    Inventor: James J. Schorfheide
  • Patent number: 4690810
    Abstract: Method for treatment of contaminated chlorosilanes with lime to obtain an environmentally inept silica base product.
    Type: Grant
    Filed: March 26, 1986
    Date of Patent: September 1, 1987
    Assignee: Union Carbide Corporation
    Inventors: William C. Breneman, David M. Reeser
  • Patent number: 4686095
    Abstract: Ultrapure silicon nitride precursor is made by: (a) continuously reacting liquid silicon halide (SiCl.sub.4) with an excess of liquid ammonia (NH.sub.3) (i) in the effective absence of contaminants, (ii) at a reaction situs in an inert atmosphere to form the silicon nitride precursor as a precipitate, and (iii) with a ratio of liquid ammonia to silicon halide (equal to or greater than 21 molar) effective to solubilize any gas reaction products; (b) providing a pressure differential to simultaneously and continuously withdraw a filtered portion of the excess liquid ammonia to leave the silicon nitride precursor precipitate in the reaction situs; and (c) adding ammonia to the excess of ammonia in said reaction situs to replace the withdrawn filtered portion of the liquid ammonia.The reaction is carried out with vigorous stirring of the liquid mixture and the atmosphere over the entire mixture is regulated to contain only ammonia vapor and nitrogen.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: August 11, 1987
    Assignee: Ford Motor Company
    Inventors: Elaine C. Beckwith, Robert M. Williams
  • Patent number: 4684513
    Abstract: An improved heated fluidized bed reactor and method for the production of high purity polycrystalline silicon by silane pyrolysis wherein silicon seed particles are heated in an upper heating zone of the reactor and admixed with particles in a lower reaction zone, in which zone a silane-containing gas stream, having passed through a lower cooled gas distribution zone not conducive to silane pyrolysis, contacts the heated seed particles whereon the silane is heterogeneously reduced to silicon.
    Type: Grant
    Filed: July 30, 1985
    Date of Patent: August 4, 1987
    Assignee: Union Carbide Corporation
    Inventor: Sridhar K. Iya
  • Patent number: 4683126
    Abstract: A method for producing an alkaline earth metal borate dispersion, comprising two steps of:(I) reacting at C. a mixture of the following ingredients (A) to (E)(A) 100 parts by weight of the oil-soluble neutral sulfonate of an alkaline earth metal,(B) 10-100 parts by weight of the hydroxide or oxide of an alkaline earth metal,(C) boric acid in an amount which is 0.5-6.5 times in mol that of the ingredient (B),(D) 5-50 parts by weight of water, and(E) 50-200 parts by weight of a dilution solvent and then(II) heating the reslting reaction mixture to C. to remove the water and a part of the dilution solvent as required.
    Type: Grant
    Filed: February 28, 1986
    Date of Patent: July 28, 1987
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Kiyoshi Inoue, Yoshiharu Nose
  • Patent number: 4683128
    Abstract: This invention deals with a process for manufacturing high purity silica which comprises making an aqueous alkali silicate solution into fine fibrous gel in a coagulant, treating the fibrous gel obtained with an acid-containing solution, and then with water to extract and remove impurities; and optionallly heating a resulting silica at a temperature of 1, C. or higher. Thus obtained silica is preferably used as a filler, especially, the one for resin compositions for encapsulating electronic parts; etc.
    Type: Grant
    Filed: June 25, 1986
    Date of Patent: July 28, 1987
    Assignees: Nitto Chemical Industry Co., Ltd., Mitsubishi Rayon Co., Ltd.
    Inventors: Koichi Orii, Masashi Nishida, Junsuke Yagi, Iwao Ohshima
  • Patent number: 4681748
    Abstract: Superoxidized sodium perborate with an active oxygen content of more than 16 wt. % and a specially adapted process for its preparation.
    Type: Grant
    Filed: February 11, 1986
    Date of Patent: July 21, 1987
    Assignee: Peroxid-Chemie GmbH
    Inventors: Werner Doetsch, Rudolf Siegel