Patents by Inventor Douglas W. Bruhnke

Douglas W. Bruhnke 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).

  • Synthesis of perfluoropropane
    Patent number: 5220083
    Abstract: The present invention relates to syntheses of perfluoropropane-- .e., octafluoropropane--from acyclic three-carbon hydrocarbons or partially or totally halogenated acyclic three-carbon hydrocarbons.
    Type: Grant
    Filed: January 28, 1992
    Date of Patent: June 15, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: James L. Webster, Steven H. Swearingen, Douglas W. Bruhnke, Leo E. Manzer, Elrey L. McCann
  • Process for the manufacture of halogen-substituted propanes containing hydrogen and at least five fluorine substituents
    Patent number: 5177273
    Abstract: A vapor phase process is disclosed for producing HCFC-225s, HCFC-235s, HCFC-226s, HFC-236s, and HFC-227s by reacting certain three-carbon reactants containing at least one less fluorine than, and at least as many hydrogen substituents as the desired product (e.g. propane propylene, allene or methylacetylene) with Cl.sub.2 and HF in the presence of a catalyst consisting essentially of chromium oxide or of chromium oxide which is combined with a refractory oxide, fluorinated and/or modified with manganese, iron, cobalt, nickel, copper and/or zinc. The temperature and contact time for the reaction are chosen to provide a product having the desired fluorine and hydrogen content.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: January 5, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Douglas W. Bruhnke, Jan J. Lerou, V. N. Mallikarjuna Rao, William C. Seidel, Frank J. Weigert
  • Multistep synthesis of hexafluoropropylene
    Patent number: 5068472
    Abstract: The present invention relates to multistep syntheses of hexafluoropropylene from hexachloropropylene. In all these syntheses the first step is a fluorination of the starting material; later steps convert the initial products to CF.sub.3 --CFCl--CF.sub.3, which is dehalogenated to the desired product.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: November 26, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: James L. Webster, Swiatoslaw Trofimenko, Paul R. Resnick, Douglas W. Bruhnke, Jan J. Lerou, William H. Manogue, Leo E. Manzer, Elrey L. McCann, Steven H. Swearingen, James A. Trainham, Cristobal Bonifaz
  • Multistep synthesis of hexafluoropropylene
    Patent number: 5057634
    Abstract: The present invention relates to multistep syntheses of hexafluoropropylene from acyclic three-carbon hydrocarbons or partially halogenated acyclic three-carbon hydrocarbons. In all these syntheses the first step is a vapor-phase chlorofluorination of the starting material to one or more saturated chlorofluorocarbons. Novel catalysts are also provided.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: October 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: James L. Webster, Elrey L. McCann, Douglas W. Bruhnke, Jan J. Lerou, William H. Manogue, Leo E. Manzer, Steven H. Swearingen, Swiatoslaw Trofimenko, Cristobal Bonifaz
  • Multistep synthesis of hexafluoropropylene
    Patent number: 5043491
    Abstract: The present invention relates to multistep syntheses of hexafluoropropylene from propane, propylene or partially halogenated acyclic three-carbon hydrocarbons. In all these syntheses the first step is a vapor-phase chlorofluorination of the starting material to the unsaturated chlorofluorocarbon CF.sub.3 CClCCl.sub.2.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: August 27, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: James L. Webster, Elrey L. McCann, Douglas W. Bruhnke, Jan J. Lerou, Leo E. Manzer, William H. Manogue, Paul R. Resnick, Swiatoslaw Trofimenko