Patents Examined by Brian M. Bolam
  • Patent number: 5348723
    Abstract: Semiconductor grade tungsten hexafluoride (WF.sub.6) is produced by reacting tungsten metal with a recirculating flow of gaseous WF.sub.6 containing a small concentration of fluorine in a heated reactor. The high purity WF.sub.6 produced is useful for deposition of tungsten metallization in fabricating VLSI integrated circuitry.
    Type: Grant
    Filed: February 7, 1990
    Date of Patent: September 20, 1994
    Assignee: Bandgap Technology Corporation
    Inventors: Bruce J. Sabacky, Robert E. Doane
  • Patent number: 5324498
    Abstract: A process is provided for purifying liquid tungsten hexafluoride containing volatile and non-volatile impurities. The process comprises the steps of evaporating tungsten hexafluoride from non-volatile impurities dissolved in liquid tungsten hexafluoride and condensing the evaporated tungsten hexafluoride. The condensed tungsten hexafluoride is subjected to freezing to solidify the tungsten hexafluoride. Volatile impurities are then evacuated from the solid tungsten hexafluoride. Thereafter, the solid tungsten hexafluoride is thawed to liquid tungsten hexafluoride to release trapped volatile impurities and then heated to a temperature above the boiling point of tungsten hexafluoride under pressure in a closed container. The volatile impurities dissolved in the thawed tungsten hexafluoride are removed and collected above the thawed tungsten hexafluoride and vented into an evacuated space.
    Type: Grant
    Filed: March 30, 1990
    Date of Patent: June 28, 1994
    Assignee: Bandgap Chemical Corporation
    Inventors: Barry J. Streusand, Don A. Almond, Robert E. Doane
  • Patent number: 5296108
    Abstract: An aqueous solution of chloric acid and alkali metal chlorate is produced in an electrolytic cell having an anode compartment, a cathode compartment, and at least one ion exchange compartment between the anode compartment and the cathode compartment. The process comprises feeding an aqueous solution of an alkali metal chlorate to the ion exchange compartment, electrolyzing an anolyte in the anode compartment to generate hydrogen ions, passing the hydrogen ions from the anode compartment through a cation exchange membrane into the ion exchange compartment to displace alkali metal ions and produce an aqueous solution of chloric acid and alkali metal chlorate, passing alkali metal ions from the ion exchange compartment into the cathode compartment, removing the aqueous solution of chloric acid and alkali metal chlorate from the ion exchange compartment, and reacting the aqueous solution of chloric acid and alkali metal chlorate with a strong acid having a dissociation constant of 1.times.10.sup.
    Type: Grant
    Filed: July 24, 1992
    Date of Patent: March 22, 1994
    Assignee: Olin Corporation
    Inventors: Jerry J. Kaczur, David W. Cawlfield, Kenneth E. Woodard, Jr., Budd L. Duncan
  • Patent number: 5284556
    Abstract: A moving fluid containing pollutants including NOx compounds is subjected to a relatively low-power alternating-current dielectric discharge for a relatively long time duration. In this manner, pollutants are oxidized and dissociated while the temperature of the fluid is kept low enough to prevent the formation of new NOx pollutants.
    Type: Grant
    Filed: May 1, 1991
    Date of Patent: February 8, 1994
    Assignee: PlasMachines, Inc.
    Inventor: Stanley R. Rich
  • Patent number: 5282954
    Abstract: Surfactants made by the successive ethoxylation and propoxylation of diamines are effective in providing a fine-grain tin coating in high-speed strip-steel plating operations under conditions of high current density. Surfactants prepared by successive propoxylation and ethoxylation are also effective.
    Type: Grant
    Filed: December 30, 1991
    Date of Patent: February 1, 1994
    Assignee: Atotech USA, Inc.
    Inventor: Vincent C. Opaskar
  • Patent number: 5266182
    Abstract: A Zn-Ni alloy plated steel plate having stable formability may be obtained by subjecting the plated surface of a Zn-Ni alloy plated steel plate having Ni contents of 10 to 17 wt. % to a dipping treatment, a spraying treatment or to an anodic treatment, using a solution containing one or both H.sub.2 PO.sub.4.sup.- and HPO.sub.4.sup.2-.
    Type: Grant
    Filed: January 15, 1992
    Date of Patent: November 30, 1993
    Assignee: Kawasaki Steel Corporation
    Inventors: Ryoichi Muko, Kazuo Mochizuki, Hajime Kimura, Toshio Ichida
  • Patent number: 5266172
    Abstract: The present invention relates to a process for the preparation of sublimable oligomers based on phenylene, linear and of controlled length, by electrochemical coupling of two lower oligomers within a monocompartmental cell with three electrodes, in the presence of an organometallic catalyst, characterized in that it comprises:1--electrolysis of the catalyst and its reaction with one of the two oligomers at a first potential,2--reduction of the insertion species obtained according to step 1, and its reaction with a second oligomer at a second potential below the first potential, and3--recovery of the sublimable oligomer so obtained, the two lower oligomers used being mono- or dihalogenated oligomers identical or different.The present invention also relates to sublimable oligomers based on phenylene obtained by this process, and their uses in electronics and/or optics.
    Type: Grant
    Filed: June 25, 1991
    Date of Patent: November 30, 1993
    Assignee: France Telecom
    Inventors: Gerard Froyer, Yvan Pelous, Emmanuelle Dall'arche, Claude Chevrot, Alain Siove
  • Patent number: 5266171
    Abstract: A process for preparing an .alpha.-hydroxymethyl acetal by the electrochemical oxidation of a carbonyl compound, e.g. an aliphatic or aromatic aldehyde or ketone, with a C.sub.1 -C.sub.8 -alkanol under non-alkaline conditions and in the presence of an auxiliary electrolyte containing from 0 to 5% and preferably 0.5 to 3% by weight of water.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: November 30, 1993
    Assignee: BASF Aktiengesellschaft
    Inventor: Dieter Hermeling
  • Patent number: 5266295
    Abstract: Hydrogen bromide can be oxidized to bromine more effectively using hydrogen peroxide as the oxidant if a strong acid (e.g., sulfuric or phosphoric acid) is also present to increase the percent conversion of bromide to bromine.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: November 30, 1993
    Assignee: Akzo American Inc.
    Inventors: Henry J. Barda
  • Patent number: 5264112
    Abstract: The invention concerns acid nickel baths containing 1-(2-sulfoethyl)-pyridinium betaine
    Type: Grant
    Filed: November 19, 1992
    Date of Patent: November 23, 1993
    Assignee: Atotech Deutschland GmbH
    Inventor: Wolfgang Dahms
  • Patent number: 5262018
    Abstract: A process for purifying a peroxygen compound in an aqueous solution of a peroxygen-stable acid or salt of the acid, comprising contacting the aqueous solution at a pH of about 0.5 to 4 with a chelating ion exchange resin and separating the product as a purified aqueous solution, or optionally as a solid.
    Type: Grant
    Filed: August 12, 1991
    Date of Patent: November 16, 1993
    Assignee: FMC Corporation
    Inventors: Morton Meadow, Charles J. Lymburner, C. Andrew Thompson
  • Patent number: 5258105
    Abstract: An aqueous solution of chloric acid and alkali metal chlorate is produced in an electrolytic cell having an anode compartment, a cathode compartment, and at least one ion exchange compartment between the anode compartment and the cathode compartment.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: November 2, 1993
    Assignee: Olin Corporation
    Inventors: Jerry J. Kaczur, David W. Cawlfield, Kenneth E. Woodard, Jr., Budd L. Duncan
  • Patent number: 5258171
    Abstract: The invention relates to a method and apparatus for generating chlorine dioxide in a reaction medium comprising a flowing gaseous carrier stream thereby providing chlorine dioxide having a low water content for use in oxidizing treatment applications which are sensitive to water. The method of the invention uses a mineral acid, such as hydrochloric acid, a hypochlorite salt, such as sodium hypochlorite salt and a chlorite salt, such as sodium chlorite salt, as reactants for generating ClO.sub.2. Air is the preferred gaseous carrier stream.
    Type: Grant
    Filed: March 28, 1990
    Date of Patent: November 2, 1993
    Assignee: Ashland Oil, Inc.
    Inventor: Sam F. Eltomi
  • Patent number: 5258112
    Abstract: A composition suitable for use in a process for electroplating surfaces with tin, including an alkane sulphonic acid optionally together with an aryl sulphonic acid; a tin source; and an additive, such as a reaction product of a sulphonating agent with Bisphenol A.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: November 2, 1993
    Assignee: Yorkshire Chemicals PLC.
    Inventors: Malcolm Wild, David Crosby
  • Patent number: 5256275
    Abstract: A solution for electroplating gold-copper-silver alloys. The solution comprises gold, copper and silver, each in the form of a cyanide complex. The solution further comprises a divalent sulfur compound capable of brightening and leveling the electroplated deposit of the gold-copper-silver alloy. Optionally, a source of cyanide ions such as a free alkali cyanide, is included in the solution. In addition, additives such as surface active agents, buffers and/or conductivity salts may also be included to impart a particular feature or characteristic to the solution. The invention additionally comprises a process for electroplating up to about 20 microns of a gold-copper-silver alloy upon a substrate utilizing these novel solutions. The alloy is deposited upon a substrate which is immersed in the solution, by electroplating at a current density of between about 1 and 15 ASF, a pH of between about 8-11 at a temperature of between about 100.degree.-170.degree. F.
    Type: Grant
    Filed: April 15, 1992
    Date of Patent: October 26, 1993
    Assignee: LeaRonal, Inc.
    Inventor: William R. Brasch
  • Patent number: 5256260
    Abstract: The electrodeposition of bismuth based materials and superconductors is achieved under isothermal, constant potential conditions using a three electrode, one compartment cell geometry operating at temperature below about 450.degree. C.
    Type: Grant
    Filed: August 16, 1991
    Date of Patent: October 26, 1993
    Assignee: University of Georgia Research Foundation
    Inventors: Michael L. Norton, Horng-Yi Tang
  • Patent number: 5254238
    Abstract: A treating solution for forming a hydroxide film on each surface of zinc-plated steel plates by cathodic electrolysis is here disclosed which comprises (a) 0.2 to 50 g/l of one or more metal ions selected from the group consisting of Mg.sup.2+, Cr.sup.3+, Ca.sup.2+, Ni.sup.2+, Co.sup.2+ and Al.sup.3+, and (b) 0.1 to 50 g/l of one or more oxidizing agents selected from the group consisting of nitrate ions, nitrite ions, chlorate ions, bromate ions and hydrogen peroxide. A process for the surface treatment of the zinc-plated steel plates by the use of this treating solution is also disclosed.
    Type: Grant
    Filed: January 25, 1991
    Date of Patent: October 19, 1993
    Assignee: Nihon Parkerizing Co., Ltd.
    Inventors: Hitoshi Ishii, Toshi Miyawaki
  • Patent number: 5254229
    Abstract: The present invention relates to an electrified object neutralizing method and a neutralizing device.The present invention is characterized in that electrons are made released by means of a photoelectric effect, negative ions are generated by making the released electrons combine with gas-state atoms or molecules, and positive electric charge in an electrified object is neutralized by the negative ions. With the features, electrification of an object can be prevented without contaminating the object.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: October 19, 1993
    Assignee: Tadahiro Ohmi
    Inventors: Tadahiro Ohmi, Hitoshi Inaba
  • Patent number: 5254231
    Abstract: The present invention relates to a continuous flow fluid reactor for chemically altering fluids. The reactor operates on standard frequency (50 to 60 Hz) electricity. The fluid reactor contains particles that are energized by the electricity to form a corona throughout the volume of the reactor and subsequently a non-equilibrium plasma that interacts with the fluid. Particles may form a fixed bed or a fluid bed. Electricity may be provided through electrodes or through an inductive coil. Fluids include gases containing exhaust products and organic fuels requiring oxidation.
    Type: Grant
    Filed: August 3, 1992
    Date of Patent: October 19, 1993
    Assignee: Battelle Memorial Institute
    Inventors: William O. Heath, Judson W. Virden, Jr., R. L. Richardson, Theresa M. Bergsman
  • Patent number: 5254323
    Abstract: A gaseous mixture containing chlorine, carbon dioxide and non-condensable gas is compressed and cooled to separate it into a residual gas formed principally of a major portion of the non-condensable gas and a condensate formed primarily of chlorine. The condensate is fed to a stripping column to desorb carbon dioxide and a minor portion of the non-condensable gas dissolved in the condensate. The stripped gas formed primarily of chlorine and carbon dioxide may be treated further. Namely, the stripped gas is mixed with the residual gas. At least a portion of the mixed gas is fed into an absorption column, whereby a major portion of remaining chlorine is absorbed to lower the chlorine content Removal of chlorine from such a gaseous mixture or an off-gas from the above process can be achieved by washing it with an aqueous solution or suspension containing an alkali metal sulfite and/or an alkaline earth metal sulfite while controlling the pH of the solution or suspension within a range of 1.9-6.3.
    Type: Grant
    Filed: August 3, 1992
    Date of Patent: October 19, 1993
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Hiroyuki Itoh, Yoshitsugu Kono, Isao Kikuchi, Shinji Takenaka, Masanobu Ajioka, Mitsuo Kudoh