Patents by Inventor George S. Fujioka

George S. Fujioka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Purification of sulfuryl fluroide by selective adsorption
    Patent number: 4950464
    Abstract: Many impurities of sulfuryl fluroide are removed by selective adsorption on activated alumina and activated carbon. Thionyl fluoride, hydrogen fluoride, hydrogen chloride, and water are removed by treating contaminated sulfuryl fluoride with activated alumina. Sulfur dioxide and 1,2-dichloroethane are removed by treating contaminated sulfuryl fluoride with activated carbon. When sulfuryl fluoride is treated with the two adsorbents in sequence, sulfuryl fluoride of exceptionally high purity is obtained.
    Type: Grant
    Filed: February 10, 1989
    Date of Patent: August 21, 1990
    Assignee: The Dow Chemical Company
    Inventors: George S. Fujioka, Brian G. Tobey, David D. Friese
  • Process for fluorinating halogenated organo-compounds
    Patent number: 4680406
    Abstract: A novel apparatus and a process for fluorinating organic compounds from halogen-containing organic compounds is disclosed.
    Type: Grant
    Filed: October 15, 1985
    Date of Patent: July 14, 1987
    Assignee: The Dow Chemical Company
    Inventor: George S. Fujioka
  • Preparation of (trifluoromethyl)pyridines
    Patent number: 4650875
    Abstract: (Trichloromethyl)pyridine compounds are reacted in the liquid phase with HF in the presence of a metal halide catalyst at superatmospheric pressures to form (trifluoromethyl)pyridine compounds in a high yield.
    Type: Grant
    Filed: May 9, 1983
    Date of Patent: March 17, 1987
    Assignee: The Dow Chemical Company
    Inventor: George S. Fujioka
  • Preparation of fluoropyridines
    Patent number: 4563530
    Abstract: A process for the simultaneous preparation of 2,3-difluoro- and 2,3-dichloropyridines from 3-chloro-2-fluoropyridines which comprises passing a 3-chloro-2-fluoropyridine over a carbon based catalyst, optionally in the presence of HF, at elevated temperatures, thereby forming the corresponding 2,3-dichloro- and 2,3-difluoropyridines.
    Type: Grant
    Filed: October 29, 1984
    Date of Patent: January 7, 1986
    Assignee: The Dow Chemical Company
    Inventors: George S. Fujioka, John C. Little
  • Chlorine exchange for fluorine in ring-fluorinated pyridine compounds
    Patent number: 4546192
    Abstract: Ring-fluorinated pyridine compounds are contacted with a chlorinating agent, preferably in the presence of a catalyst, under favorable conditions to yield pyridine compounds having a chlorine substituted in the ring-fluorine position(s).
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: October 8, 1985
    Assignee: The Dow Chemical Company
    Inventors: George S. Fujioka, Alexander P. Fung
  • Catalytic preparation of sulfuryl fluoride
    Patent number: 4382072
    Abstract: The use of a supported, metal catalyst in the reaction of Cl.sub.2, HF and SO.sub.2 increases production of sulfuryl fluoride and reduces the formation of by-products relative to charcoal catalysts employed in the prior art. Palladium on carbon catalysts have been found to be particularly active.
    Type: Grant
    Filed: November 16, 1981
    Date of Patent: May 3, 1983
    Assignee: The Dow Chemical Company
    Inventors: George S. Fujioka, Danae A. Vanderhoof
  • Regeneration of activated charcoal catalyst used in sulfuryl fluoride production
    Patent number: 4087377
    Abstract: A method of regenerating the activated charcoal catalyst used in the production of sulfuryl fluoride by reaction of sulfur dioxide, chlorine and hydrogen fluoride, comprising treating the spent catalyst with an anhydrous stream of hydrogen fluoride at about 350.degree. to about 600.degree. C.
    Type: Grant
    Filed: December 20, 1976
    Date of Patent: May 2, 1978
    Assignee: The Dow Chemical Company
    Inventors: George S. Fujioka, Jim Love, Russel R. Peterson