Patents Examined by Alan Seigel
  • Method of producing fluorinated organic compounds
    Patent number: 6080899
    Abstract: A process for producing a fluorinated organic compound comprising: (a) reacting an organic starting material with hydrogen fluoride in the presence of a fluorination catalyst and an HFC reaction solvent to produce a product stream containing the fluorinated organic compound wherein the reaction solvent has a boiling point higher than that of the fluorinated organic compound; and (b) recovering the fluorinated organic compound from the product stream.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: June 27, 2000
    Assignee: AlliedSignal Inc.
    Inventors: David E. Bradley, Kevin Benson, David Nalewajek, Alagappan Thenappan
  • Purification of saturated halocarbons
    Patent number: 5449845
    Abstract: A process for reducing the content of unsaturated impurities in saturated fluorohalocarbons and fluorohalohydrocarbons by contacting the impure saturated fluorohalocarbon and/or fluorohalohydrocarbon in a substantially dry fluid state with a substantially dry amorphous solid metal oxide composition consisting essentially of cupric oxide, cobaltic oxide, silver oxide, manganese dioxide, or a mixture of any two or more thereof, at an effective temperature up to about 300.degree. C.
    Type: Grant
    Filed: October 2, 1990
    Date of Patent: September 12, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard E. Fernandez, Wendel R. Cassel
  • Methods of using diethyldithiocarbamic acid for the prevention of hair growth
    Patent number: 5362748
    Abstract: The subject invention relates to methods for regulating hair growth in mammalian skin comprising topical application of diethyldithiocarbamic acid ("DEDCA") or a pharmaceutically-acceptable salt thereof. The subject invention further involves topical compositions comprising DEDCA.
    Type: Grant
    Filed: September 15, 1993
    Date of Patent: November 8, 1994
    Assignee: The Procter & Gamble Company
    Inventors: Richard J. Schwen, Donald L. Bissett
  • Process for the manufacture of 2-chloro-1,1,1,2-tetrafluoroethane and pentafluoroethane
    Patent number: 5300710
    Abstract: A process is disclosed for producing HCFC-124 and HFC-125 which includes reacting certain pentahaloethane starting materials (e.g., CF.sub.3 CHCl.sub.2) in the gaseous phase at an elevated temperature in the presence of certain supported metal catalysts containing effective amounts of zinc. A catalyst of metal fluoride on a fluorinated alumina support having an atomic ratio of F to Al of at least 2.7:1 and containing .beta.-aluminmum fluoride, is employed.
    Type: Grant
    Filed: March 20, 1991
    Date of Patent: April 5, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: David R. Corbin, V. N. Mallikarjuna Rao